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  1. Jeep O2 sensor question

    Upstream O2 sensor.
  2. Jeep O2 sensor question

    Help! Have a 98 Jeep TJ with the 4cyl engine. The upstream O2 sensor had thrown a code showing the Jeep was running rich. Which it was as evidenced by the black soot under the tailpipe when cranked as well as the smell of raw gas and the horrible gas mileage. It was replaced and all seemed...
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