o2 sensor

  1. T

    O2 Sensor? 1989 C2500 5.7

    Hi All, My 89 C2500 is running silly rich. It smells bad and I get buildup on the plugs somewhat regularly fouling one.. My first guess is the ECU is in some kind of a limp mode as the PO apparently eliminated the O2 sensor. At least I think this truck had an O2 sensor, I am not entirely...
  2. N

    Where and how many O2 / oxygen sensors in my 1990 V8 5.7L? (verifying what I see in the Chilton)

    Hi everyone, I just want to double check and verify what I'm reading in the Chilton manual for this truck. I have a 1990 GMC SIERRA 1500 SLE, 4WD, 5.7L V8 TBI. I don't know the transmission that is in it (I hope I'm giving enough information here). The manual says : "The oxygen sensor is a...
  3. F

    O2 sensor...Possible Fix

    I have a 1999 GMC Yukon 5.7 4WD and I'm getting a P0157 code which is bank 2 sensor 2 low voltage. I've replaced the sensor and still the same thing. The voltage fluctuates between 0.005 volts to 0.050 volts, sometimes it goes up to 0.080 volts. Now I'm thinking it might be a short somewhere in...

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