Check Engine Light On With Code PO138 Is That Before Or After Catalytic Converter Oxygen Sensor

If after the catalytic converter oxygen sensor where can i find a good website that shows how to replace it(DIY) with pictures/photos without buying haynes/chiltons repair manual ? would adding fuel injector cleaner/seafoam/or the tightening the gas tank lid works ?

Answers for The Question

  1. tech1
  2. Dave3507
  3. tronary
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