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Check Engine Light

~3400 answered questions
Parent Category: Fuel and Engines
The check engine light comes on in a car when the engine is experiencing a problem. Ask questions here about your car's check engine light.
If you are referring to the Service Engine Soon/Check Engine Soon light it can only be safely shut off with a code scanner. All cars manufactured after 1996 have OBD-II computer systems and they all work pretty much the same. You can purchase a scanner for under $100.00 at auto parts stores or even …
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When the light comes on you can check it with a OBD ii handheld scanner that you can purchase or go to your local auto parts store that will probably check it for free and tell you what the code is. However, most stores will NOT reset the computer because they cannot confirm that the repair was perf…
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Answer This fixed it on my Ford. Part cost about $50 at the ford dealer. The oxygen sensor is located below the engine in the exhaust pipe before the catalytic converter and muffler. It is mounted in the pipe with wires going to it. You need a special socket to remove it in most cases but someti…
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Your ignition timing might be advanced too much which would cause knocking as well as the hard starting problem. This could also trigger the engine light to come on so having a competent shop check the ignition timing would be a good place to start. The answer can depend on the year. What year is it…
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Just disconnect the battery for a couple of minutes, and that will clear the error code that's causing the "Check Engine" light to come on. Careful with those pesky little clips to the battery compartment cover...they break easily.
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You have a fog light that is out replace the bulb and fuse and everything should work again. I have a 2000 Pontiac grand am and I was at work when someone told me my fog light was on. I went out to turn them off and it wouldn't work I had to call my husband and he told me to take out the fuse. When …
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You need to see what the code is. Most likely it is an O2 code or EVAP code both are very popular on that model.or...there is a crack (or cracks) on your gas filler neck (usually near the gas cap) and the computer is detecting that gas fumes are leaking. That's what the code was on my 2001 Explorer …
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Sometimes simply disconnecting the battery will clear codes, or after cycling through the start mode so many times will do it .You can also plug an O.B.D. unit into your E.M.C. as a code reader and clear codes.   Pull the fuse for the ecm.
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Have the Codes read by a code scanner; some autoparts stores do this with out charge (Autozone in Texas does this).You can also purchase a code scanner, but they range from $150 - $500.
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Re-set? There is a problem that needs to be addresed. This car has OBDII. If there is no problem it will shut off on it's own. Get it to a Independent garage that knows Diagnosing. One common problem I have seen is a loose gas cap, but don' bet on it.   easiest way to reset the stored codes i…
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Engine controls: All vehicles equipped with fuel injection systems have computerized engine controls. These systems maintain the best driveability and performance at the lowest emissions. The Computer (ECM) relies on sensors (O2 sensors, MAF, ECT) and actuators (EGR valve, IAC valve, Fuel Injectors)…
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Sounds like you need lessons on how to drive a stick shift. But even tough you have trouble shifting the engine service light shouldn't come on. I am not sure if the engine light would come on if you got the RPMs too high while shifting. good luck  New Answer HeadlineThe service engine soon li…
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unattach the battery for a few minutes and then reattach. it will reset itself if there was just a gas cap issue. I have a 2004 Sienna. The "Maint Reqd" light came on at exactly 7500 miles. I saw it. A check of the maintenance manual shows that an oil change should be done every 7500 miles. Coinc…
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%DETAILS% I guess Autozone's free check engine light check wasn't free. But it sure make a great guessing tool for them to sell parts! PO301 is the code your refering to. I would try a professional fuel injector cleaning. even if it doesn't solve you proiblem your at least getting somthing you ne…
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Service Engine Soon Light The Service Engine Soon light and the Check Engine light are not the same! The Check Engine Lamp is an indication that a malfunction has occurred somewhere in your system's EVAP, MAP, MAF, PCM/ECU, TCM.... etc. Usually, these problems require that a service facility properl…
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my 2 cents The memory in the computer is lost when the battery is disconnected for an x amount of time on this model car. All the self test the car has run (monitors) need to be performed again by driving the car. IF the check engine light was on, it will come back after it fails the test that…
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%DETAILS% Answer Try a different shop if can't solve it. If you have less than 36,000 miles, take it back to the dealer for warranty repair. PO301 is a misfire in the first cylinder. Were the codes properly cleared when the work was done? He could have eliminated the injector by swapping it…
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%DETAILS% if alt and battery good. then there is a dead short in the switch .by the way have alt output checked i have had brand new alt's. that were duds and did not work right.   bad ground on battery or switch
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That is not normal. There are many things that could be causing that problem. The easiest and cheapest thing you could do is to replace the fuel filter. Usually they will run just a few bucks at the local auto store. If that doesn't do the trick, try to see if your car is smoking at all and try to d…
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%DETAILS% Answer The check engine light means that there is a posssible problem with the engine . There is not one specifc problem that it could be. The dealership can look at the chip and figure out the specific problem and get you going in the right direction. Answer Apparent…
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Accord Check Engine Light The proper way, of course, is to repair the problem that caused it to come on. Another way I read on a website was to bring your car to an Autozone who will diagnose the problem and reset the light for you (and hope you buy the part to fix the problem). The quick and dirty …
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MASS AIR FLOW SENSOR! Only use 92 or higher octane fuel and add injector cleaner to the fuel tank at least once a month!   If the hesitation is when you accelarate, it could be bad spark plugs and/or wires/distributor cap and rotor.   My 97 did that and it turned out to be bad O2 s…
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%DETAILS% Answer There are numerous reaons for your check engine light. Check the tightness of gas cap, one of the many sensors you have may be back, emission related possibly. Go to you nearest Autozone and they will check it for free. That would direct you to a possible solution.
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You will need to plug into the car's OBD II connector and scan vehicle's computer for codes.Now, repair the problem that caused the light to come on, then clear the computer system.If the repair is successful, the light will stay off. Otherwise, it will come back on again after some driving interval…
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One user's answer There are three ways to shut off the "Check Engine Light" discount battery (not recommended): use a scan tool and delete code, or wait 40-80 key cycles, depending what the code was set for. Now, if you discount the battery for around 5 minutes, the Check Engine Light will come o…
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"Disconnect the negative terminal and push brake pedal for 30 seconds" worked great! One note: You must use actual key to unlock doors after battery disconnect to reset car alarm so car will start. I recomend getting the car checked out by a professional. And you never unhook the positive batter…
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This is out of the haynes code book. Disconect the negative battery cable for thirty seconds. Simply removing the negative terminal from the battery for a couple minute and put it back. that should work If light keeps on apperaring, you should replace the oxygen sensor located on the headers. Why…
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hmmm check the flywheel in your transmission, because that is the only thing that comes in contact with your starter motor. im no expert but that's is what happened to me. also have your transmission flushed to remove excess debris. change your transmission filter. and run fuel injector cleaner thro…
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your vacuum switch is located on the intake manifold to the rear passenger side, it might be stuck open therefor putting out high voltage readings, that's how your computer fugures out if it's open or closed. You might try checking out your emission's systems (misspelled) because it might have some…
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You can try disconnecting the battery cable for 20 min. and see if that works, or take it to an independent garage and pay less than at the dealer.any1 w/ the snap-on scanner can reset it. as long as u have the odb II scanner... but it will eventually goes back on, make sure see the codes , common c…
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Turning off the Maintenance Required Light on a CivicHere are answers and opinions from FAQ Farmers:I have an '03 Civic and I have the REAL answer right here. There's a couple of steps to follow, so here we go: 1: put the key in the ignition. Don't turn the car on or turn it. 2: next to the odometer…
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Since it is OBD11 it requires a scanner to retrieve the codes. Most parts stores will read then for free. you can use a car scanner to clear it out.
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Go to Auto Zone and have the codes read free to find out what is not operating properly. If a certain thing is indicated, it doesn't mean that the part is bad, but it needs to be checked out.
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Check Engine LightFirst check the gas cap. If not closed properly or it's cracked or broken, gas fume emulsions are escaping and the check engine light will come on. When you place the cap back, make sure it is a good, tight fit. Or if you have one of those caps that "click" as you turn to close, ma…
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It means take the car to the dealer for its scheduled maintenance.   You can also check for a reset button for your vehicle. In a certain number of miles the check engine light will come on you you can take it to the dealer and they can charge you $50 to $100 dollars to reset it. They won't t…
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Take both the positive and the negative battery cables completely loose from the battery terminals. The removal of the cable will work for pre '96 models but the later ones have to have the codes removed with a scanner. Auto Zone will do it for free.   You may need a new fuel cap. I hav…
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%DETAILS% Answer Hey Amy==It depends on the make, and which engine you have. I would check the bolts on the a/c compressor, and the belt for correct tension and if it is a serpentine belt check it for cracks and brittelness. Goodluck. Joe
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Answer It is the intake air temp is low. The sensor that is in the air intake before the throttle body is probably disconnected. The "0" in p0112 is generic. See Mazda specific codes below--look at P1112. Locate the sensor by facing engine and find a black box in front of you. The sensor is …
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Answer No way that I'm aware of. A "diagnostic tester" will not give you the magic answer. It will give you a code that narrows down the problem area. It does not tell you what the exact cause is. For example, You get a code that says O2 Sensor 2 bank 2 lean condition. That shouldn't be interpret…
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%DETAILS% Answer In the similar situation Mazda dealership thought it's the distributor that needs changing.
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Perhaps this may help you in your search for causes. A high hydrocarbon reading is usually unburnt fuel. If the CO reading and the NOx readings are below the limit then look towards an ignition problem as being the most likely culprit. As the prior answer suggested, start checking items and begin wi…
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%REPLIES% Answer Hey GlennA lot of codes are set because of a bad ground. I would see if they came back on. GoodluckJoe Answer Trouble Codes work off of a three step trip.The service engine lights that came on tested itself, once you tried to start your vehicle.Everything should be f…
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the check engine light comes on for many reasons here are a few egr valve, co2 sensor,engine temperature sending unit,running lean running rich gas cap is defective, timing and the list goes on and on if you are handy all these items are explained in the haynes auto books very well and it also tells…
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Take it to a mechanic who will use a computer to read a problem code generated by the car's computer. He will repair the problem and reset the light.Plain English problem codes are not used to encourage car owners to take their cars to the dealership for repair. However, any competent mechanic will …
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You may have knocked off a wire when you reconnected the starter wire, Check the wire going to the O2 sensor. if this isn't it take it to a shop and have them scan the ecm. It could be a flewk.good luck....Michael
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The "check engine light" is a warning light that is illuminated when there is a problem with the EMISSION SYSTEM only. Emission system being the pollution control system. It is a good thing once you understand it. <><><> The " check engine light" is also known as a malfunction in…
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Hey Mike==It can but why guess. Go to Auto zone and have them check it our for free and you will know what is causing the light to come on. You can clean 02's but be sure the carb cleaner you use has NO silicone as it will ruin it for sure. GoodluckJoe
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Just assuming it has between 50,000 and 80,000 miles it is almost certainly the O2 sensor. Very popular after 50,000 miles and hardly ever causes any noticeable problems except maybe a slight drop in fuel economy because it will be running a little rich.   I have a 1998 Mercury that this ha…
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Possible cause poor fuel pressure. Replace fuel filter first. Doesn't solve problem check fuel presure. Need to know what kind of car you have for futher diagnostics. You're fuel pump may be bad. There are other things that can cause this but need more information.   Your car may be equipped …
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%DETAILS% Answer Hey Mona==Get it checked out before you ruin the engine. If the gauge is gound into the red there is a problem somewhere. If you ignore it you can ruin the engine which is megabucks. GoodluckJoe
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With the ignition off--hold down the button you use to reset the tripometer, then turn the ignition on while still holding the reset button down.The light should flash then go off.   Once you hold down on the re-set button and turn on the ignition, you need to continue to hold the button down…
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The previous answer was good for high dust environments (and if you have a Ford Van all environments are to be treated as high dust) but for those of us in high corrosion environments, consider the following: If you have an Explorer (Or Ranger/Mazda B-series) check for a broken wire near the left s…
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Answer The check engine light codes have to be read and removed with a scanner on anything after '96.Auto Zone will do it free.GoodluckJoe Answer To reset the "check engine" light, simply disconnect the battery for a moment and it will go out. This worked for me on my 98 Ranger. Answer…
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Push the odometer reset button in, hold it, turn on the key. It will flash a few times then go off. This will reset the Maintenance Required light not the check engine light.   Disconnect the HOT side of the battery for a few seconds--then reconnect(will likely have to reset the radio statio…
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just a quick note: bank 2 is LEFT side (drivers) on a rear wheel drive vehicle ,on front wheel drive vehicles it would be the front side when looking down from the front of the vehicle ,Sensor 2 is after the cat converter! if you replace that sensor, clear the codes or have someone clear them for yo…
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%DETAILS% To find out what is wrong with it you will have to take it to a repair shop or the ford dealer with a computer to hook it up, but the engine light being on something is wrong with the car, it kinda sounds like a ingition coil pack going out, if so it will only get worse and could also b…
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Check Engine lights can come on for a variety of different reasons. It could be something as simple as the gas cap is not tight enough or it could mean you have a cylinder misfire. The check engine light usually comes on for some sort of emission problem. With the vehicle stalling out especially at …
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%DETAILS% Answer If it is a 1995 200SX SE-R it should NOT give a 402 error code. Nissans up to 1995 did not report 402. 1996 to 1998, error code "0402" indicates a problem to the "Fuel temperature sensor or circuit". Check sentra.net for a list of pertinent error codes. Chris
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%DETAILS% Answer Hey Xiaolin=It is probalby in deed of a good tune up and just missing. Take it to a good garage. GoodluckJoe
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Hey Derek==You have clutch problems. Take it to a garage and have it repaired. GoodluckJoeI regularly have this every 4 yrs or so the transmission selector bushes need renewing cost approx 50 to 70 pounds , classic signs are difficulty selecting the reverse or 5 th gears initially not sure waht happ…
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HeyKen==You need to repair what turned it on in the first place then have auto zone remove the trouble codes. GoodluckJoe
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%DETAILS% Answer Hey Donali==The u/s stands for up shift. This tells you when to upshift the trans for the best economy. If it has been a while since it has been tuned up it probably needs one. GoodluckJoe
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Simply remove the negative battery cable for 30 seconds. GoodluckJoeDBonds831 says - This will work, but it will also require resetting the clock, radio stations, etc. It's cheating and if the problem hasn't been fixed, it will only be a temporary fix as the light will come back on. I am researching…
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I have a 1996 Caprice, I assume it's the same method. You turn the key to the "on" position. Fully depress the accelerator three times within 5 seconds. Then turn the key off. When you restart the car, it should be reset. this did not work   the light is on because there is a problem you…
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Check the coolant level in the radiator when it is cold.--------------------------------------------------------------------**Actually the check coolant light indicates the reserve is low. When facing the engine with the hood up...look to your left and you should see the tank. Fill that to the fill …
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It may not have anything to do with the oil. Go to Auto Zone and have the codes read and repaire them. GoodluckJoe
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Hey Michael==Go to auto zone and they will read the codes for free and it will tell what direction you should go to repair your car. GoodluckJoe   Autozone can only scan 1996 and newer lincolns! They CAN check the pre 96 ones but it requires them to actually look for the right connector an…
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have the cooling fans checked out.
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I have an 88 Ford Taurus L wagon and something like this is happening to me. The transmission is slipping in and out of overdrive and when it does the "check engine" like goes on briefly. I still have to have it looked at so I don't know about the code. But, my car did not just quit working right aw…
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If I'm not mistaken, the code you are refering to is for the Secondary Air Injection system. The system injects air into the exhaust if the car during the first few moments after you start the car. It's purpose is to assist in warming the catlyitic convertors to operating temperature. As this modul…
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The main reason that a speedometer and odometer will stop is because the speed sensor, located on the back top area of the transmission, has gone faulty. The part can be had very easily at any auto parts store, or junkyard. The reason the check engine light is on is because the speed sensor signal g…
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First, if it is something like a loose gas cap, just tighten it and it will reset itself in the next 100 miles or so. If it is something else, like a leaky gas cap it will never reset. But to reset the OnBoardDiagnostic (OBD)Computer... Go to eBay and search "obdII" and buy one, they run about $50.0…
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Go to auto zone and have the codes read free. You can use a code reader, go to auto zone as stated, or do a manual check by counting the code read out on the check engine light. It tells you how to do this in the work manual for that vehicle. You can get the manual for around 12 bucks at most auto …
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Check your oil pressure sensing plug. This is after making sure you have sufficient oil and it has been changed recently.  Honda has the light automatically go on at certain intervals so you can run back to the dealer and invest in their service dept. If all seems well with the motor, hold the…
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Answer The service engine soon light on a 2002 Altima 3.5SE means you need to have some sensors replaced. Depending on when your car was built, it may have 2 or 3 recalls. The major recalls are for a crank shaft sensor and two cam shaft sensors. You wouldn't expect a 'service engine light' to tri…
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If you have the controls on your steering wheel than all you have to do is push the button with the little gas pump logo on it until engine oil life and the % come up on the little screen, then hold down the arrow button (lower right) for 5 or so seconds and it will say oil life reset and it will go…
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Headline Sensors go off in that car all the time. Try unplugging your battery for 10 mins then hooking it back up. If that doesn't work, then try sanding down your gas cap. If THAT doesn't work then it could be a sensor on your exaust, so if all that doesn't work, take it to a diagnostic test center…
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%REPLIES% Answer I DONT KNOW FOR SURE BUT I DO KNOW THAT IF YOU DONT GET THE CAR REPAIRED YOU ARE INDANGER OF STARTING THE CAR ON FIRE THE CONVERTOR RUNS NORMAL AT 1500 DEG. WHEN IT GLOWS THERE IS A MAJOE PROBLE WITH THE ENGINE RUNNING TO RICH OR LEAN. PLAESE DRIVE THE CAR TO THE HYUNDAI DEALER…
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Usually you can simply disconnect the negative battery terminal (while vehicle is not running), wait a few seconds, then reconnect it. I've used this to reset the warning light on a 1989 Chevy pickup (and other makes & models). The only way to erase the check engine light on a 96 and newer vehi…
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Disconnecting the negative battery terminal for 10+ minutes usually resets the Service Engine Soon" light. Please note that it will reset everything else electrical in your car as well (e.g.- radio and clock). If the light reappears shortly after reconnecting and restarting the vehicle you will need…
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I was personally able to solve a P302, misfire in 2nd cylinder, code by replacing the spark plugs and wires. Worked fine after that. It's generally a very simple ignition problem. I found on line that the p300 coad is a random missfire in all cylinders and that the last number in a p300 code is …
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%DETAILS% Answer Have a manual gauge installed temposrarily and see if the sending unit is not correct. If it is you have engine problens.
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Go to auto zone and they will do it free.   The new ODB II system found on '96 and newer vehicles prevents you from reading the computer without the proper tool.Advance Auto Parts will read the codes for free, other car parts places may also - of course in the hope you can buy an item there t…
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Take it to autozone they will do a free diagnostic test and tell you what is wrong with it....
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Take it to Auto Zone and have the codes downloaded and read. If you download the codes (as above states) and they are too cryptic to decipher, then: Could be any or all of the following: Fuel pump - not working at full capacity Fuel lines - restricted somewhere Injectors - clogged ( or still clo…
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Yes. Go to auto zone and have the codes read for free. And change the fuel filter.
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Depending on the vehicle, it may illuminiate the light because of low battery voltage.
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%REPLIES% Answer Take it to the dealer. They have check out charts. Answer This happened to me in a 96 Monte Carlo. The dealer did not have time to look at it - we were on a road trip out of town - but suggested it might be the key. Ours has the chip in it - maybe your does, too? He sai…
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The only way to truly turn it off is to fix the problem. To do that, either purchase a code reader or have a third party pull the code for you.   autozone,advance, and some others will check the trouble codes without a charge. This is a starting point on diagnosis.
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no, trac lights have to do with traction control, this is part of the A.B.S system, what are the codes that are stored, you could check the connector for corrosion or loosness but I need more info to help.
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First off where is it? If it is in line then you can cut that section off and replace it with rubber fuel line of equal size.
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Disconnect the battery and then reconnect it. Or bring it to an auto parts store and they can hook it up to the tester that they have for it, tell you what's wrong with it, and then it will reset.
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First, if it is something like a loose gas cap, just tighten it and it will reset itself in the next 100 miles or so. If it is something else, like a leaky gas cap it will never reset. But to reset the OnBoardDiagnostic (OBD)Computer... Go to eBay and search "obdII" and buy one, they run about $50.0…
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Remove the negative battery cable for 30 seconds. This works on pre '96 cars.
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From 1989 on, the maintenance required light is turned off using a DRB-II Scan tool that most professional shops and the dealer have.   Or, if you are Cheap,,,er, I mean Cost Effective orientated, like me and wishto spend the cost of a service call bill for other things, a strategicallyplaced…
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Answer If there is no sound at all, your solenoid on the starter has likely failed. If it clicks then you either have a weak battery, or failing solenoid. Answer If the check gauges light is on and the vehichle refuses to start check each gauge display for any signs....is the oil pressure at …
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, I had the same "no bus" all gauges dead on my 2000 ram 1500. after looking at all the different answer posted I tried all of them and the one that worked. Was disconnecting the main plug held down by a screw in the fuse box on the engine compartment. I disconnected, blew the plug and the connect w…
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%DETAILS% Answer Take it to Auto Zone and have the codes read free. I t should tell you why the light is comming on.
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Hundreds of things could cause the check engine light to come on as with any car. To determine what the problem is you must use an OBD II code scanner. Autozone or some other diy parts stores will do this for you for free. Always check the Gas cap to make sure it on tight. A loose gas cap can cause…
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Go to auto zone and have the codes read for free. They will also look up the meaning of the code for you, but be careful about taking their advice on how to fix the problem. If you have an older Focus, buy a code reader on eBay for approx. $50.00 USD. (OBD-II) because you will need it a lot. The Che…
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