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International Automotive Technicians Network
Re: Isuzu NPR/NQR P0420
Posted to HD/Fleet Forum on 5/17/2018

Isuzu has a TSB for this P0420 code. They instruct to update the ECM software to fix the problem if no hard faults are present. If you have IDSS just go into controller programming and you should be able to see if the software update is eligible. [P0420 TSB] Login to read more.

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