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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

Why does the check engine light come on in your 2000 Accord?

My mom has a 2000 Honda Accord Lx and had the same problem. It ended up being a faulty gas cap.

Your 94 wrx wont boost or rev past 4500 rpm th odd time when its cold it will boost and it runs greatthe engine warning lights on its also runnin the high octain fuelcan the knock sensor cause this?

I guess the knock sensor could cause this,anything is possible, but I have never seen a knock sensor do anything like this. The first step is it get your vehicle hooked up to a Subaru scan tool, and get the engine light fixed.

How do you reset computer on 2002 Kia Sedona?

After repairing the cause of the code, you can clear it with a scan tool.

Lights on the dash nuff already how can you turn - disable - the lights on your dash tire pressure service engine soon abs trac engine security light. can these lights be disabled?

Are you saying that all these lights stay on after you start the car? If so, you need to get the problems fixed that are causing the lights to stay lit. You have these problems. ABS-Anti-Lock Brake System problem. Check Engine- Emissions Controls Problem Trac- Traction control turned off Tire Pressure-Low Tire Pressure Security-?? Read your owners manual carefully.

How do you reset the check engine light in a 2002 Chevy Cavalier?

Try taking the positive terminal off the battery and holding the brake for at least a minute. then put the positive terminal back on and hold the brake for another minute and that should do it.

Is it dangerous to drive a vauxhall zafira if emission light comes on?

Depends on what is meant by "dangerous".

The warning light comes on when the engine management computer detects a fault with one of the many sensors that are on modern fuel-injected engines.

Some of these sensors play a vital role in keeping the engine running, others do not.

The warning light is like "pain". Pain in ones big toe is not "dangerous" but the same pain in the chest is. One is an ingrowing toe-nail, the other is a Heart-attack.

In the worst case the crank-shaft position sensor might be giving a false reading and cause the engine to cut out at 70 on the motorway, in the fast lane, in heavy traffic, and cause an accident (the Heart-attack) which could be dangerous. On the other hand it might be that the "air temp sensor" is reading -150oc which is clearly never going to be true, so puts the light on (an growing toe-nail). At worst this will cause very slight loss of power and perhaps slightly higher fuel consumption.

To answer the question briefly "It is a warning light." it is warning you of a fault. Ignore it at your own peril.

How do you reset the check engine and ABS light?

On most new car, you can disconnect the negative cable on the battery for about 30 second but make sure that you have the radio code secured if you are working in a Honda or any car that have an anti theft system.

Can bad gas turn on check engine light?

Yes, it is possible as you may have a miss. That miss would turn on the check engine light.

If the 'service engine soon' light comes on in your used 2001 Sentra SE with 81K miles on it is this serious?

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 tell you your vehicle has a reset button they will tell you to bring it in.

its probably just the oxygen sensor. have it looked at/ its not that serious

Mine came on at 105K kms (~ 65K miles). I bought an OBD II Code reader off of Ebay for $50 and found out that the 'System was too lean' So it's not serious in my case. But I haven't taken any steps to fix it. A friend recommends I take care of it since a lean system can cause wear to the valves.

Mine came on at roughly 80k, the engine would stall while I was breaking, and excelleration became difficult. I had the code read and it was I believe bank 1 sensor 2...system too lean. I had it diagnosed and its the mass airflow sensor. You can take this part out and have it cleaned or you can spend the 500-600 on the part from Nissan (not including labor time) because they insist the car will chew up and spit out generic brand sensors (nissans are nitorious for it ANYWAY!)

A code reader for your car is a pretty good investment. Two or three uses will generally pay for it. If your code indicated something like a defective oxygen sensor or a mass air flow sensor, you would probably want to get that fixed because most of the errors you see will affect gas mileage and at todays prices, can you afford to ignore it?

What will cause the check engine light to come on and off on Chrysler cirrus 1999 lx1?

On my 98 Cirrus, replaced the fuel cap and then disconnected the battery for 10 minutes and the check engine light turned off. My wifes Lexus had a similar problem. Sometimes a different brand of Gas will do the trick too.

^ I tried this today and it worked! Thanks so much =)

When changing the 02 sensors and the spark plugs on a 1998 Nissan Maxima why would the service engine soon light still come on?

Have the service engine soon (check engine), same thing light scanned to know exactly what is the problem. You may purchase a cheap scan tool at some car shops like Canadian tire and scan the code yourself. Obviously make sure to change the defective parts with good parts and cancel the code afterwards. I hope this was helpful.

2000 Toyota Rav4 with 61000 miles and my check engine light came on I checked the gas cap and it's on tight any suggestions on what to do?

The check engine light indicates a problem with you engine that may or may not affect the way it runs, the only way to tell is to have the codes read at the dealer or a parts store that will do it for free and use the information gained to affect a repair.

On a 2001 aztek does anyone know the amps or ohms that the plug should be reading that connects to the EGR Valve you put a new one in and the computer still shows an EGR valve problem?

I searched my DVD and i cant find any specifications but looking head on at harness ends from the right whihc is cavity A to left which is cavity E these are the wires- A GRY 435 EGR Solenoid Low Control B BLK 2753 Low Reference C BRN 1456 EGR Solenoid Position Signal D GRY 2702 5 Volt Reference E RED 1676 EGR Solenoid High Control

Is a secondary air injection malfunction a serious problem?

On cold days, it can be a problem, but not minor or major. To fix this problem, read the following;

To fix the secondary air injection system, you'll probably need to replace the pump, which is called an "air pollution pump". It is part of the emissions. Prices range for around $150-$250. Also, you can tell if your pump is working by listening to the car on a cold day when the vehicle starts up. If you hear a wining noise, that's good! This whining noise is the pump working. The pump comes on to help limit bad vapor such as co2 from escaping into the atmosphere, however Its main function is to help warm up the car until the

oxygen sensors kick in, which can be anywhere from 60-120 seconds. If you don't hear a wining noise, and your check engine light is on, then you will probaly need to get you air pollution pump replaced.

How do you reset the check engine light on a 2002 Toyota RAV4?

Try disconnecting the battery for about 10 minutes - or have vehicel scanned to determine problem and have codes cleared

How do you reset 2007 Toyota Sienna check engine light?

How to Reset the "MAINT REQD" Light on Toyota Sienna With the car started (ignition on), set the LCD odometer readout to total mileage (not trip A or B). Turn the car off (ignition key to the OFF position). Push in AND HOLD the button/knob that switches the odometer Turn key to ON position without starting the car. You will notice the maintenance light blink and go out. Release the odometer button/knob. Turn key to OFF position. That's it! The "MAINT REQD" light has been reset to warn you to change your oil in another 5,000 or 7,500 miles or so.

1998 Mercury Mountaineer check engine light?

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.

What does it mean when the emission light comes on in a 2003 Ford Focus?

Could be several reasons - simplest one is that the gas cap was not screwed down tightly enough. Make sure the cap is tightened down and then drive the car for a day or two until the computer re-sets itself. If the light doesn't go out then continue looking for other causes having to do with the car's emission system. (i.e. - PCV valve needs cleaning/replacing - one of the hoses is plugged or kinked, etc, etc.

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