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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

Check engine light turns off on its own?

If you have a dying catalytic converter or O2 sensor, some codes could be thrown such as 'P042' but then clear themselves after some time passes and the problem is no longer detected.

Why does 2008 ford escape engine light flash on and off?

If the check engine light is flashing on and off with the engine running , that

means that an engine cylinder misfire has been detected

Why does the check engine light come on in a Honda odyssey after getting gas?

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.

How do you reset the service engine soon light on a 2003 Chevy blazer?

You need an OBDII scanner tool. You can visit autozone and they will scan it for you for free but usually won't reset the light because they want to sell you the part that would shut off the light. It's most likely that it's the O2 sensor behind the catalytic converter. But it's worth the trouble to find out first. Harbor Freight tools has a scanner for about thirty dollars. A quality Actron scanner will run you about 80 but it's worth the extra money.

Why does the Mitsubishi Galant check engine light come on?

there could be a thousand different reasons. there is no way to tell or even guess with the iformation you have given.

Mazda mpv 2000 VTCS Fault?

There is one issue for this fault. The manifold runner control actuator needs replaced and this will solve the problem.

Will turning off the service engine light make a car not pass smog?

It can, if the cars computers have not had enough time to do all of their self diagnostics it will fail smog. They don't want you resetting the light on your way to the test.

Why would a check engine light be on Vstar 650?

It's only purpose is related to the TPS (Throttle Position Sensor) attached to the carbs...

The TPS controls ignition advance...

What can cause the check engine light to come on in a Dodge Neon?

you probably have obd codes that are coming up,,if you turn the key on and off 3 times and then leave on you will have codes come up,,,mine come up on my odometer reading,,they will show as po116,,,stuff like that,,,i found a web site that gives you discriptions of the codes and from there you will be able to tell what is wrong,,, you

What could be the problem when your check engine light comes on and you transmission is slipping in a 2000 Lincoln Navigator?

Well With The Check Engine Light on It can Be many problems. If The Check Engine Light Blinks when you hit The gas and The car stutters makeing it feel like a tranny problem it might be a misfire. A misfire can be caused by spark plugs but most likey in the navigator it is a ingnition coil problem. 1st i would go to a repair shop and put it on the the computer to find out the trouble code for the check engine light and take it from there.

How do you reset the Service Engine Soon light on a 1999 Chevrolet Tahoe?

There are 3 usual ways:

  1. Disconnect the negative battery cable for about 5 minutes.
  2. Remove the ECM fuse(or fuses) for about the same amount of time.
  3. The best way is to take your vehicle to a repair shop, dealer or some auto parts (Auto Zone for one) and have them plug in their scan tool, pull any codes, then clear them. If you don't repair the cause of the codes, the light will come back on after a while.

It is common for the check engine light to come on as result of gas cap not tightened after fill up. Check to see that it is tight, and drive for a while. The computer should reset after next fill up.

What could the problem be if your check engine light came on and engine runs rough?

It could be that you have not tightened the cap on your gas tank. Be sure to check the gas cap and see if its being properly tightened. That was the case for me a couple of times.

1997 Honda civic engine light came on seconds later the interior and exterior lights go high then low like there breathing The speedometer meter is jumping around like crazy from 0 to 100?

if you check the engine codes, and get the variable speed sensor, o2 sensors, and the too much electric 1298, and fuse 15 blown, then it's probably the wiring harness c115, track down TSB 99-029

How do you reset the maintenance required warning light?

Check your owners manual it will tell how to shut it off or if it doesnt tell you then a dealer service dept. has to do it

What makes the check engine light come on?

PENDING ON THE VHICLE, IT COULD BE AS SIMPLE AS A SENSOR BEING LEFT UNPLUGGED AT THE AIR CLEANER, OR A SENSOR GONE BAD, LOW OIL, CLOGGED AIR FILTER, AND OR THE CATALITIC CONVERTER CAN BE PLUGGED. IT CAN BE MANY THINGS AND I SUGGEST GETTING TH VEHICLE PLUGGED IN TO A COMPUTER. Autozone (and probably other auto stores) will read the code(s) for free. Saves going to the dealer and paying $30...