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The light is on because there is a problem with the emissions system. The engine may appear to be running fine but the emissions of the engine are out of spec. It may be as simple as a loose gas cap. Have the ECu scanned with a scan tool to retrieve the code that has been set by the ECU. This will help you find what part is being effected.
What else can I help you with?
If your Pontiac grand am ETS Light and Check Engine light are on but the car runs fine how can you fix?
You need to start by having it checked for codes. Then you will know what to diagnose/fix.
95 suburban check engine light comes on over 60MPH after 3Miles go off on restart truck runs fine help please?
check O2 sensor
Why does a 1993 Explorer engine cut out when first pressing on the gas and runs ruff in 1st gear and check engine will turn on but when on freeway check engine light turns off and runs fine?
sounds like a (tps) throttle position sensor. need to have it put on a scanner to check what trouble codes are stored in the ecm.
Does anyone have a 2002 Chevy Malibu that engine light stays on car runs fine right now?
Check your pcv valve or your gas cap :P
1995 Contour V6 runs well at lower speed and then check engine light glows above 3500 rpm and engine misses then light go out and engine runs fine at lower speeds?
Sounds like either your fuel pressure regulator, fuel filter or throttle position sensor.
1997 Kia Sophia runs rough and check engine light flashes?
and what code does the check engine light say ? go by autozone they will check it for free and get the code.
Why would the temp and fuel gauges tachometer and speedometer not be working on a 1996 Grand Am SE if other lights are on and the car runs fine and the check engine light is not on?
relay
What are signs of a belt jumping time on a 2003 Chrysler Sebring?
Check engine light, low power, no start, runs rough, bent valves,Check engine light, low power, no start, runs rough, bent valves,
Why does my 98 neon stumble on acceleration with the ac on but it runs fine with the ac off but the check engine light comes on and only indicates a misfire?
The a/c pump kicks on and off to compress the cold air. When it does this it draws power from the engine. The check engine light for misfire is probably from a different problem like timing or spark plugs
My 1992 Lexus LS 400 trac light comes on frequently also the check engine light comes on occasionally too. So far no issues as the car runs fine. What might be the cause or issue?
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.
Problem with your rav4 in that the check engine light came on will a egr sensor replacement fix it the car runs fine?
If there aren't any problems with the operation of the vehicle replacing a censor isn't necessary . By disconnecting the battery terminals and reconnecting this will eliminate the engine light.
99 ford expedition runs rough and check engine light is on?
Auto Zone will check your engine codes for FREE. Then go from there.
