O2 Faults

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Originally Posted by Viper5

About 8 mo. ago I got my car. One of the things I did is replace the O2 sensors since it was giving me a bad reading for one. I replaced them all with USOS-4000 Universal Sensors. Now it is reporting bad O2 sensors again. This is the breakdown of what has been happening:

7/29/09 - P0139 (replaced)
8/13 - P1118 (replaced)
8/30 - P1502, P1115, P1117, P1119 (replaced both pre sensors)
current - alarm has gotten wet and can't proceed but before that happened CEL came on once again

The thing that concerns me is that on the Durametric website, it says in troubleshooting '00 986s that when multiple O2's go off, it can mean that I have a bad MAF or air leak. That P1502 is suspicious. I had that code before and it turned out that my brake booster hose had a leak. Replaced it and CEL went away. This was about 3 mo. back. What do you guys think is going on?

Ignore your MAF. These codes are not related.

P1502- Throttle jacking spring test-
Clean the contacts to the throttle jack and be sure the harness is not damaged. For more info: http://www.renntech.org/forums/index.php?act=Search&CODE=show&searchid=300de68904ded095af73b8701e48489d&search_in=posts&result_type=topics&highlite=%2Bp1502

P1115,p1117,p1118,p1119- O2 sensor heating below threshold.
Bad sensors, wrong sensors for your car model, mis-wired sensors, damaged wire harness. You currently have no working O2 sensors so no monitoring of your mixture. This can damage your cats and potentially your engine over time.