Question about 2003 Oldsmobile Alero

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Service engine soon light comes on all the time

My service engine soon light comes on all the time, and sometimes it will turn the traction control off. Most of the time all you have to do is unscrew the gas cap and wait a few hours and it will go off. Now the O2 sensor is sending out errors to the computer (thank you Auto Zone for checking for me). Anyone know how common this is?

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Very common. Over time the O@ sensor builds up carbon from your exhaust which causes it to mis-read what the fuel air mixture is leaving the engine. This is a very common easily fixed problem.

Posted on Jul 16, 2009

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When I start my 2001 alero the anti-lock, traction light, service engine soon, service vehicle soon lights all stay on all the time. But my car seems to be running fine. Why is this?


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Hello. The ABS [anti-lock brake system], traction control and service engine soon light are all interconnected. The ABS and traction control each depend on sensitive sensors to send a signal to your car's computer that there is a problem. The problem unfortunately is that the sensors themselves are bad. If your brakes still pump themselves when you stop fast, for example, then your ABS system is still working but one of your sensors is sending a signal anyways.
To check everything out you can take your car to many auto parts stores, or most recently AAMCO transmission stores, where they will scan your computer for free. Once the scan is done you will know exactly why the service engine soon light is on.
In the meantime, you do not need to worry about your brakes because all the ABS system does is pump them for you. You can still pump them yourself, like folks did for years before ABS came along. Same is true with the traction control. As long as you do not drive wrecklessly you need not worry.
So to summarize, call around to auto parts stores, or AAMCO to get a free scan. Once you have those results you can decide on how to proceed.
Here is a great link if you want more information. http://www.aamco.com/Check_Engine_light_on-FREE_Check.asp
Regards, Joe PS kindly rate my answer. Thank you.

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http://www.greatautohelp.com/dtc/dtcindex.html

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