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Check Engine Light
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.
7,238 Questions
How can you reset the 2008 Tundra Maintenance Light?
While holding the "A" trip meter button down, turn the ign switch to "on" ( not start). Hold the trip button down and watch the trip meter count down from - - - - - , - - - - , - - - , - - , - . That's it.
Check the EGR selenoid valve. The vacuum will pass throught the defective selenoid valve and go the EGR valve even if it has not been activated. The ECM will not detect a defective selenoid valve - only an EGR problem.
DPFE sensorIf it's a Ford product, you may need a DPFE sensor. You should also check for a restriction in the EGR passageway.How do you reset check engine light on Ford Windstar?
You need a code scanner, I bought one on eBay for about $40.00 It's called (OBD II).
AnswerThe computer has detected a problem that affects the emissions controls. After having the computer scanned and the problem corrected, they will reset the light. Answerremove the negative battery cable,wait 5 min,put it back on,computer will reset itself AnswerOn all cars 96 and up disconnecting the battery to reset a fault code will also result in very poor fuel economy and driveability issues for a few hundred miles. Go to your nearest Autozone, they will scan the computer and clear the code FOR FREE! AnswerYou get what you pay for.Pull the codes from the computer, match the code to the troubleshooting procedure, follow the procedure to find the source. Repair the source, light will go out if that was the only problem. There are "monitors" or self tests the computer runs the car through a drive cycle, if a problem occurs, it may not run all of the self tests until that problem is taken care. Therefore, another problem may exist. It is emission related. OR hook up a scanner that is capable of clearing codes, and hope that none are still active.The " check engine light" is by far one of the most misunderstood technological advances by the public. I am sure I will revise this as time goes on, as it is an in-depth understanding for the public. It is a warning light that is illuminated when there is a problem with the EMISSION SYSTEM only. Emission system being the pollution control system. Don't get a hard on against it as it is a good thing once you understand it. One point that was brought up a a recent meeting of technicians was that the amount of hydrocarbons is greater when the gas cap is left off than when the engine is running. Hydrocarbons are part of pollution emitted as gasoline evaporates. Going a step farther, one facet of the emission system is the "Evaporative" portion. This is when the fumes from the gasoline are leaking from the system into the outside air. This is one part of the emission system that can trigger a check engine light. I would say that about 7% of the vehicles that have a check engine light are the result of a loose or inadequate gas cap. But understand that many scenarios are possible with the "check engine light" The vehicle's powertrain computer (note that some vehicles have 17 different computers) will run a series of self-tests. They will only run under certain criteria. And they can be vastly different from manufacturer to manufacturer. Some self-tests are not run until preceding ones have run successfully. So if there is a problem in one particular area that is preventing another self test from running, you can have a situation where one problem is fixed, but another still exists. If you fix a problem and drive the car through a drive cycle that sets the monitor (or self test) the light will go off as it passes that criteria that triggered it in the first place. After 1996, the auto industry went to a idea called OBD II (on board diagnostics). This was to get all the manufacturers onto a similar plane for troubleshooting and powertrain control. While they still differ vastly, many corrections and adaptations were made for technicians to better fix the check engine light problems. Prior to this there were so many different and poor troubleshooting data from a check engine light problem that resolving the problem was much more difficult. Many early warning light of this nature were set to illuminate based on mileage. An Oxygen sensor was one of the things that were meant to be replaced when that mileage was hit. This is much like many current "Change oil lights� that are set based on a pre-set mileage.
AnswerDisconnect the negative battery terminal and wait 15 minutes and hook back up. AnswerEasiest way is to disconnect the negative battery cable for a couple of minutes, then reconnect. This will erase the error codes from the computer. If everything is okay, the CHECK ENGINE will stay off. AnswerNote that disconnecting the battery will turn off the check engine light, however, the on board computer is then temporarly rendered incapable of giving a reading for emissions testing. This will result in a failed test until the system has re-activated. What this means is, if you have a problem passing emissions testing, you will still have that problem. AnswerEither try disconnecting the battery for about 10 mins. or have vehicle scanned to determine the problem and have codes clearedYou can't - you need a scanner / tool to reset it. However - you can disconnect the battery and that will clear all the codes.
By far the easiest way without the computer scanner is to disconnect the battery for a few minutes - that will clear everything from the computer.
How to reset or clear check engine history light codes?
Just from recent experience, I have noticed when my check engine light has come on and I want it to go away, I cycle the key to the position right before actually starting the car up three times. The real way to erase it is by using the diagnostic tool at your local autoparts store, plus its free!! An "Advance Auto Parts" or "AutoZone" or any other typical auto parts store will be able to hook up their OBD II device to your ODB II port typically under the dash, around/near the steering wheel. They can tell you what is giving the code, and also clear/reset the code. Now, if the light turns on again? Take it back there, have them give you the code again (if it's a new/different code) - have them reset it, then go have the problem fixed. I've also heard you can reset it by removing the negative terminal from the battery....but I'm not really a mechanic type....so not too sure.
Most auto part stores can and will scan vehicle and detemine problem
Why do Lights stay on when engine is shut off?
It is normal operation. With "key on engine off" the check engine light should be illuminated so you can observe that it is properly functioning.
How does one pull check engine light codes 1999 Mazda 262?
Use a OBD-II code puller or scaner you usually can barrow one from autozone or a similar place.
What does OBDII code P0171 mean and what needs replacing?
"System lean, bank 1" First, I would suspect a vacuum leak. The engine is getting unmetered air. Check for disconnected vacuum lines, cracked rubber/plastic vacuum lines on the engine, on the firewall, in the engine compartment.
The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to a parts store or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.
I had this issue my self with a 89 try loosning up the distributor turn it one way a little start it up and keep doing this till it gets better or worse.
AnswerCould be a lot of things. I'll make some assumptions, first that the car runs fine otherwise, and maybe has a slightly rough idle, and second that the codes being pulled do not indicate timing problems.Things left:
1) EGR system Idle Air EGR valve Blocked EGR ports on throttle body plate
2) Bad failing fuel injectors.
3) Torque converter lockup bad
What do the codes indicate?
AnswerTake to Autozone for OBD2 check.May be air mass flow sensor, clogged catalytic converter. Dirty fuel filter will cause dirty injectors and clogging of catalytic converter.
AFTER ALL OF THIS IT WAS A RELAY RIGHT UN THE HOOD ON THE RIGHT SIDE JUST HAD TO CLEAN IT.
ITS HARD TO TELL THE SPECIFIC REASON A WARNING LIGHT LIGHTS UP ON A VEHICLE WITH OUT CHECKING IT, BUT A BLINKING LIGHT USUALLY MEANS HAVE CHECK ASAP. A STEADY LIGHT MEANS HAVE IT CHECK AT YOUR CONVINIENCE.
Why not just repair it. Use a code scanner to figure out what's wrong, and replace the faulty part then the check engine light will go off normally. The light is there as a diagnostic tool to tell you that you need to read the computer code and repair the problem. Agree with above. Fix the problem and it may improve your gas mileage. Most likely a O2 Sensor located on the Exhaust manifold before the Catalytic Converter. Go to AutoZone and ask them to run a free scan to see what the code is reading. Fix the problem..don't make it impossible to know when your engine is out of oil by removing the only indicator lamp. Good luck.
What is the hold light on a 1998 Kia Sportage?
You have two lights on dashboard which are linked to your auto transmission, 1. POWER which will hold the gears for a longer period during going up in gears for higher accelaration, and 2. HOLD when climbing hills or overtaking the hold button will drop down a gear and maintain that gear until button is released, just helps to maintain gear and accelaration instead of the gear dropping halfway through overtaking or climbing. Both of these buttons are on your shifter, Hold, on side of shifter at top and Power will be a button left hand side of base plate. Hope this helps, Iain.
Your check engine light came on what can you do?
Have vehicle scanned at auto parts store or garage to determine the problem
Get the engine code then reask question to get a better answer. The Mass Air Flow sensor could be malfuncting causing bad o2 sensor readings also. Good luck.
How do you reset check engine light on 1996 s10?
take the negative cable off your battery and wait half hour and reattach if it comes back on better get the codes read.
Is there a fuse for the check engine light?
There may be a fuse. Drop by an auto parts store and ask them to reset it for you.
How to reset Check engine light on 1998 Saturn?
you need access to an OBDII scan tool in order to reset the check engine light on any vehicle 1996 or newer. autozone or advanced auto usually provide this service for free
Can oil leak without engine light coming on?
Yes, the check engine light is for emission, and electrical failures, not oil leaks or fluid levels.
What is the engine management light on a Peugeot?
The engine management light is systematically there to fore warn you if there is something going wrong!
I had a similar prob with mine on the 406 and had it checked out, computer anylized, the lot... nothing was found bar a possible dodgy censor behind the dial consol.
Not a very ethical answer here but i used give the dash a quick "thump" and the e.m light went out. Had there been anything wrong, I was told the e.m light wouldn't go out.
Hope this helps..
Service engine light - 2001 Saturn L200?
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
How do you get rid of a check engine light on an 2004 Pontiac grand am?
Disconnect the battery from the car for about 10 minutes; If that doesn't work take it to the shop and have the codes read and reset.
In new york state can your car pass inspection with light on?
The answer is simply no. It doesn't matter if the light turned on for one of Chevy's annoying "50,000 mile checks" or if there's a sensor out, etc... The 'Check Engine' light is an instant inspection failure in New York State & they WILL charge you for the inspection. Yes it's completely ridiculous, but what do you expect, it IS New York State. The politicians here would mug you on the streets if the state government thought they could get away with it.
What is the trouble when the check engine lite is on?
Faulty catalytic converter, or sensors in exhaust faulty
