<< Is there a cross reference that has this information or do you have to develop your own approach based on automotive systems knowledge?
There are code remedy guidance charts , but system knowledge is the key.. [and system inter-relation]
You have a good example right here....
02 sensor code coupled with AIR code could be an aging 02 sensor that does not read well at lean conditions.
So, why would an AIR/02 sens code point in this direction??
B/C the computer does an AIR operation test by looking at the 02 signal when the AIR is energized... if the sensor does not report back to ECU that it has seen a very lean condition [ low volt ] at this test. it pops an AIR code...[ the AIR system can be fine , but the ECU/DM has not recieved an OK verification sig from 02].
Knowing this , one would do some 02 sens testing, specially
the 02 lean capacity....
Sytem knowledge and some common sense on the inter-relationship of parts/systems...a couple of codes ... some diagnostic equipment to test your conclusion... and you are there.
Many un-needed parts are changed due to lack of knowledge b/c a code charts says 'xyz part system' is misread as a bad part...
A code will tell you what street you are looking for , but not what house....
Last edited by Arthur Dalton; 06-18-2003 at 10:48 AM.