Getting engine codes P0137 n P0157 Low volts???

Question

I own a 2000 gmc sierra 1500 4.8L and i have a k&n cold air and flowmaster dual exaust, now i've had these on here for about a year now and i've never had a problem, started when i went up moosehead for a weekend and the roads were veryyy dusty and on the way home my engine light came on, now i figured it was cuz my filter was dirty but i cleaned it n still a problem, dont know if its cuz of that dirt or not. The engine runs fine, when the light came on i didnt notice a difference in performance (no black smoke). I know the code has to do with low volts to the o2 sensors just dont know what to do to fix the problem. Is there a way to trouble shoot or whatever with out having to replace 2 sensors. hard to think 2 would go just like that. i've had the codes cleared plenty of times but they come back on,mostly when u hammer on it.

Answer 1

When you clean the sensors use a solvent that leaves no residue like alcohol, thoroughly dry out the sensors make sure that the air filter canister is properly sealed and that the intake hoses are all tight and sealed. a small vacuum leak on the intake side can cause a fault.

good luck

Answer 2

The very first thing you should do is unscrew the Oxygen sensor located on the exhaust somewhere, then soak it or clean it with a cleaning solvent. Thenyou should pull the ECM fuse and clean it. Finally, get a wiring diagram and search for other sensors and/or relays and/or fuses along that particular line and check those others. Oh yeah. Check the ground and if all else fails change that oxygen sensor. Other things to check would be exhaust leak, but I'm willing to bet you'll need new oxygen sensor.

Answer 3

Home

Oxygen Sensor


On your 2000 GMC Truck Sierra 1500 4WD, the Oxygen Sensor is:




Under vehicle, driver side, below seating area, mounted in exhaust pipe in rear of catalytic converter