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I have a 2005 Hyundai Elantra, now shows a PO138. Where is it? I think there are 2, need this location

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Code p0138 refers to ho2s and o2s both in bank 1 both causes ---wiring---short to positive- Replacing both sensors in bank 1 should fix the fault ---ensure that you use the correct tool for this as anything else will twist the wires and cause faults.

Posted on Jan 03, 2014

  • 1 more comment 
  • William Noe
    William Noe Jan 03, 2014

    Thanks very much, you say 2 sensors, right? Did you mean before and after the catalytic converter?

  • Bill Boyd Jan 03, 2014

    the HO2S is before the cat cinverter and the o2s is after the cat in bank 1

  • William Noe
    William Noe Jan 03, 2014

    Thanks again!



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