Originally posted by Michael41:
1997 V6 Cotour 115K+ miles ATX
CEL came on 3 years ago; about 2 months ago noticed a change in performance and gas millage
P0153 Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 2.
P0171 System Too Lean - Bank No. 1.
P0174 System Too Lean - Bank No. 2
P0300 Random Misfire Detected.
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2.
If you haven't changed the spark plugs before I would suggest doing that first. Also check to make sure the spark plug wires are seated properly (and the correct firing order is in).
FIREWALL
4-6-5 <--coil pack
3-2-1
1-2-3 <--engine
4-5-6
BUMPER
http://www.obd-codes.com/trouble_codes/generic/p0300-random-multiple-cylinder-misfire-detected.php
You may also want to consider checking for vacuum leaks and exhaust leaks or stuck EGR, dirty MAF, PCV.
http://www.v8sho.com/SHO/TSB0197HO2SServiceTips.htm
And yes, O2 sensor for upper Bank 2 (near radiator) could also be the culprit.
Last edited by Tony2005; 08/17/05 05:39 AM.
