Car runing lean
Car runing lean these are the codes i pulled out of the pcm
P0131: O2 sensor circuit low voltage (B1S1 = Front left sensor)
P0137: O2 sensor circuit low voltage (B1S2 = Rear left sensor)
P0151: O2 sensor circuit low voltage (B2S1 = Front right sensor)
P0157: O2 sensor circuit low voltage (B2S2 = Rear right sensor)
P0171: [Fuel] System too lean, (B1 = Left bank of motor)
P0174: [Fuel] System too lean, (B2 = Right bank of motor)
I was told that it near impossible for all four O2 sensor to go bad at once i checked the connection and wire at all the sensors near the exhast came up with nuthing can anybody help me out
P0131: O2 sensor circuit low voltage (B1S1 = Front left sensor)
P0137: O2 sensor circuit low voltage (B1S2 = Rear left sensor)
P0151: O2 sensor circuit low voltage (B2S1 = Front right sensor)
P0157: O2 sensor circuit low voltage (B2S2 = Rear right sensor)
P0171: [Fuel] System too lean, (B1 = Left bank of motor)
P0174: [Fuel] System too lean, (B2 = Right bank of motor)
I was told that it near impossible for all four O2 sensor to go bad at once i checked the connection and wire at all the sensors near the exhast came up with nuthing can anybody help me out
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Joined: Nov 2001
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From: Houston, TX
Very common problem is the hose after your PCV valve tearing open. Check for any vacum leaks, air coming in after the MAF is then not metered and will cause your car to run lean.
Good luck, and post up what it was man.
Peace,
Craig.
Good luck, and post up what it was man.
Peace,
Craig.
Originally Posted by CRAGER
Very common problem is the hose after your PCV valve tearing open. Check for any vacum leaks, air coming in after the MAF is then not metered and will cause your car to run lean.
Good luck, and post up what it was man.
Peace,
Craig.
Good luck, and post up what it was man.
Peace,
Craig.
hmm my experiences with unmetered air, were usually the car will run fat....considering the computer is trying to make up for the excess air that it reads in the o2s....it will dump more fuel in....as much as 14-25%, until the car throws a "running rich" code and closes it down to 2-7% until the problem is resolved.....
i wouldnt be suprised if this is a "i ported my maf" problem 
