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...
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...