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catalyst

  1. 1G Problems & Issues
    I just bought the car, so do not know if there are mpg issues or anything like that. It has 203K on it, and it doesn't look like the previous owner was too much into preventive maintenance like replacing parts without codes. Here's what I have so far: The Codes: P0420: Rear bank catalyst...
  2. 1G Under The Hood / Performance
    I've had an intermittent check engine light and finally got the code: P0420 - "Catalyst system efficiency below threshold (rear cylinder head)" Can anyone translate that into plain(er) english? JOE in IL
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