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Chevy 2500hd o2 sensor problem
Replaced both o2 sensors forward of the cat with Bosch units and truck runs worse then with the old original ones, will stall and backfire.
Fuel milage has been getting worse so I figured new sensors should help, after running for a while I checked codes and po137,po157 rear o2 sensor low voltage. I also tried the new sensors one at a time and same problem, put the old ones back in and runs fine, just with poor fuel consumption.
Do the rear sensors have to be replaced at the same time?
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87 930,
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