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  1. J

    2012 Isuzu NPR-HD Catalytic Converter and DPF Issue

    Just a follow up to this, we are still having issues and are very stuck now. Once it DEF/Diesel contamination issue was figured out, the whole DEF system was dissembled and thoroughly cleaned and a new catalytic converter installed. After all that work was done, we still get P0420 catalyst...
  2. J

    2012 Isuzu NPR-HD Catalytic Converter and DPF Issue

    Just an update, Turns out someone put diesel in the def tank, needed full cleaning and new catalytic converter.
  3. J

    2012 Isuzu NPR-HD Catalytic Converter and DPF Issue

    Thanks I will give that a try -Jon
  4. J

    2012 Isuzu NPR-HD Catalytic Converter and DPF Issue

    Thanks that makes sense for the p2463, that was the day he drove it back when couldn’t get manual regen to work on the side of the road. Thanks
  5. J

    2012 Isuzu NPR-HD Catalytic Converter and DPF Issue

    Hi, I have a 2012 Isuzu NPR-HD with approx 90k miles and am having issues with DPF regen and Catalytic Converter. First off when driving highways speeds, it does a regen about every 125-150 miles. If there is no traffic and moving ok, there is no issues. If stuck in any stop and go...
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