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#1
03-24-2011, 10:46 AM
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1999 gmc 2500
1999 GMC 2500 with a 6.0 Liter. I am pulling trouble codes for all 4 o2 sensors. The codes are P0137b, P0154b, P0155b, P0157b. Is that telling me that all 4 sensors are bad?? Hard to believe that they would all go out together. What might be tripping the sensors? Any help would be appreciated. Thank You
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