1991 Geo Tracker "read codes" Questions

what is the 420 code on a 2001 chevy tracker P0420 - Catalyst System Efficiency Below Threshold (Bank 1) The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm ...

...read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the ...

...read the error codes on a 1991 Geo Tracker? You must use a short jumper wire to ground the white diagnostic connector. This terminal is part of the Assembly Line Diagnostic Link (ALDL), located under ...

...higher than normal, among other things.A mechanic would check engine temp and use a scanner to "read" the O2 sensor data

...Read Codes from Check Engine Light?http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html-------------Diagnostic Code P0540 continues to return and the MIL light is ...

...codes. They are read in order and the car / van remembers which one was used last. If you use the wrong code in the sequence then the car / van will ignore it and not let you start the engine. The ...

...the vehicle seems to be running well. THIS IS A WARNING LIGHT YOU SHOULD TAKE IT IN A GET A CODE READ AT LEAST. BETTER SAFE THEN ...

ligth "on"service engine soon p0116 Po116 is a code for coolant temp sensor out of range. I would check the temp sensor data with a scan tool to see what it is reading. If it is lower/higher than it ...

...read the codes on a 1991 geo tracker? How do you turn the check engine light off? Please see my tip at http://www.fixya.com/cars/r5932051-check_engine_light_check. These are generic instructions. If ...

...read that all 4 o2 sensors were bad (only this would happen to me at 1 time) so I replaced all 4 sensors and erased the stored codes drove the car about 20 miles and the check engine light came on ...