There are several houdred things that can make your check engine light come on, most of them can are emission control related. Something as simple as a loose fuel cap can make your check engine light come on on late model vehicles. The first step in the diagnosis would be to find out what fault code turned on your check engine light.
There are serveral large chain parts store that will read the codes for you free of charge. As I stated earlier, knowing the code is the first step in the diagnosis. Once you know the code, there is a standardized diagnostic flow chart for each code. An oxygen sensor code (there are several) does not nessisarily mean you have a faulty oxygen sensor, the sensor may just be what senseced the problem.
Once you know the code, let me know & I'll do my best to help.
Sunday, August 9th, 2009 AT 9:07 PM