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The Check Engine Light will illuminate if you have a bad or failing oxygen sensor. Q:When should replace the oxygen sensor?. A:Oxygen Sensor Failure Symptoms Fuel Systems. Firstly install sensor body ensuring lead wire is not twisted or bent, Do not use impact wrench or socket type wrench to install sensor ,M18 sensors - install finger tight then 1/2-3/4 turn with a wrench (35-45Nm) ;.
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