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code 0134

  1. O2 sensor code 1166 and 0134

    Problems & Issues
    Problem: 03 Ex gas mileage dropped 30-40% or more.. Check engine light on Trowing trouble codes 1166 & 0134 Fix: I replaced upstream O2 sensor (aka air fuel ratio sensor) with a Denso 234-9005. I found it on amazon for $150 plus shipping. To my relief the gas mileage has been restored to...