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    1. 08-31-2016, 07:40 PM #5
      jamesd
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      Quote Originally Posted by Joe021 View Post
      I fixed the P0017 code when I replaced the timing belt. The car has been sitting for a while. Could that cause the P0420?
      Many things could cause the P0420. Anything from a plugged catalytic converter to a damaged rear (downstream) O2 sensor. I would checks the wires and connectors to the O2 sensor. Also I would check any exhaust leaks or damaged to pipes too.
      Last edited by jamesd; 08-31-2016 at 08:38 PM.
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