Engine Performance problem
1997 Oldsmobile Aurora V8 Front Wheel Drive Automatic 151000 miles
I replaced my air filter 2 weeks ago with a K& N. Since then my check engine light has been going on and off. Both o2 sensors heater low voltage and slow response, p1139 p1140 manufactured controlled codes whatever that means, (Fuel and Air Metering). EGR Flow, p101 MAF. Now I cleaned the MAF sensor and its still acting up, bbut only at low RPMS, highway driving is fine. I was told O2 sensors would not cause this because the computer would compensate to a preprogrammed setting if it detects a malfunction in O2 sensor. Samer thing with MAF. They said computer would compensate if it sensed a problem with sensor. Is this true and if not what do I replace first O2 sensor or MAF sensor. Car is really running hot (250 degrees) but was told that normal for that vehicle. Really Loud clanging noise under heavy load mainly during takeoff. (Possible detonation?) I guess my question is, can one sensor cause the other sensors to throw codes or are they all bad, I dont want to fix somethinf that isn't broken.
Wednesday, February 25th, 2009 AT 4:43 AM