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o2 sensors

  1. T

    Where to start P1174

    Hey guys I have been looking over older threads to maybe clue me in to where to start on my truck. So a little back story since I just bought my 2008 Avalanche LTZ. A week after I purchased it I got a check engine light. Heart sank till I ran the code with my scan tool. Came back as a P1174 Bank...