DavidS
Active Member
- Joined
- February 24, 2005
- Messages
- 54
- Reaction score
- 0
- City, State
- Kingsport, TN
- Year, Model & Trim Level
- '02 Eddie Bauer
Suddenly last week, my 2002 Explorer EB 4.6L V8 started running terribly while stopped at a drive thru window. The "service engine soon" light came on. At idle it surges wildly with rpm's bouncing from 600-1200 and acting like it's going to die. It causes the whole vehicle to quiver badly and you can tell it even under way if the rpm's are in the 1000-1500 rpm range. When you come to a stop, the rpm's try to stay around 1000 rpm's until you've stopped then it starts surging up and down again. I took it to Autozone to have it scanned and it showed a bunch of codes:
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P0171: Fuel Trim Bank One condition, O2 sensor recognizes a rich or lean condition on one engine bank only.
Probable causes
1. If banks one and two together suspect fuel pressure or MAF Sensor.
2. O2 sensor defective
3. Iginition misfire-repair
4. Fuel injectior problem
P0174: Fuel Trim Bank Two condition.
Probable causes: same as above with addition of Failed HO2S21.
P0300: Cylinder misfire detected-random cylinders.
Probable causes:
1. Ignition system fault
2. Vacuum leak
3. Injector fault
4. High or low fuel pressure
P0316: Crank Sensor condition
Probable causes:
1. Crank sensor defective
2. check connector & wiring to sensor
3. Check trigger wheel for damage
P1131: Lack of bank 1 O2 transitions-lean
Probable causes:
1. Misfire on bank 1
2. Vacuum leak affective bank 1 only
3. Fuel injector problem bank 1
4. Engine mechanical condition
P1151: Lack of O2 switches Bank 2 sensor 1, ECM couldn't adjust fuel trim of a lean or rich conditon.
Probable causes:
1. Fuel pressure high or low
2. MAF sensore dirty/defective
3. Vacuum leak on engine
4. Leaking fuel injector or fuel pressure regulator
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Has anyone had anything like this happen to them before? I'm going to clean the MAF Sensor but I can't imagine it causing all this. It's strange that all this started all at once. Do O2 sensors suddenly fail, especially together like this? Any help would be appreciated as my dealer charges a minimum of $100 just to check it out and then the parts and labor for repair. I'd like to do it myself if possible. Thanks to all!
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P0171: Fuel Trim Bank One condition, O2 sensor recognizes a rich or lean condition on one engine bank only.
Probable causes
1. If banks one and two together suspect fuel pressure or MAF Sensor.
2. O2 sensor defective
3. Iginition misfire-repair
4. Fuel injectior problem
P0174: Fuel Trim Bank Two condition.
Probable causes: same as above with addition of Failed HO2S21.
P0300: Cylinder misfire detected-random cylinders.
Probable causes:
1. Ignition system fault
2. Vacuum leak
3. Injector fault
4. High or low fuel pressure
P0316: Crank Sensor condition
Probable causes:
1. Crank sensor defective
2. check connector & wiring to sensor
3. Check trigger wheel for damage
P1131: Lack of bank 1 O2 transitions-lean
Probable causes:
1. Misfire on bank 1
2. Vacuum leak affective bank 1 only
3. Fuel injector problem bank 1
4. Engine mechanical condition
P1151: Lack of O2 switches Bank 2 sensor 1, ECM couldn't adjust fuel trim of a lean or rich conditon.
Probable causes:
1. Fuel pressure high or low
2. MAF sensore dirty/defective
3. Vacuum leak on engine
4. Leaking fuel injector or fuel pressure regulator
-----------------------------------------------
Has anyone had anything like this happen to them before? I'm going to clean the MAF Sensor but I can't imagine it causing all this. It's strange that all this started all at once. Do O2 sensors suddenly fail, especially together like this? Any help would be appreciated as my dealer charges a minimum of $100 just to check it out and then the parts and labor for repair. I'd like to do it myself if possible. Thanks to all!