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For 2004-2009 Toyota Prius I4 1.5L. 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 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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