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Cat problem?

Discussion in 'Stock 1995 - 2001 Explorers' started by panteramatt, June 29, 2009.

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    1. panteramatt

      panteramatt Active Member

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      City, State:
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      Year and Model:
      07 Mountaineer V8
      Had my wifes 97 explorers computer ran since its had a check engine light and it came back as p0420, catalyst efficiency below threshold bank 1. Does this mean the cats are bad or the o2 sensor? Which ones are they? Any fixes?
       
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    3. marragtop

      marragtop Well-Known Member

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      If the truck is running ok, I'd reset the codes and see if the CEL comes back on. Could be a false reading.
       

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