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Re: Isuzu NPR/NQR P0420
Posted to HD/Fleet Forum on 5/15/2018 2 Replies

John,

We have a fleet of about 10 of these we work on. We finally bought the Isuzu IDSS setup.

We had one in the fleet that kept throwing the P0420 from time to time. We ran through the diagnostic trouble tree for the code. This is a quick run down from th... Login to read more.

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