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Isuzu NPR/NQR P0420
Posted to HD/Fleet Forum on 5/11/2018 9 Replies

Have a few customers with Isuzu NPR's and have seen P0420 a few times on them, follow the troubleshooting tree and never really find anything. These trucks all travel around in NYC in stop and go. Can't seem to pin point the issue, sometimes drivers admit to s... Login to read more.

9 Replies Received (View Replies)