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P0138 Service Engine Code


Big Buck

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Posted

I have a 2015 GMC Sierra SLT 2500 4x4. Service engine light came on. Code reads P0138. Cleared code after checking gas cap. Service engine light and same code reappeared 4 days later. Anyone else have this problem ?

 

 

Posted

Code scanner showed bad O2 Sensor on Bank 1 Sensor 2. A bit unusual for only 20k miles on truck.

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