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Re: 2012 Isuzu NRR mystery exhaust system problem
Posted to HD/Fleet Forum on 10/12/2020

It sounds like it has a faulty NOx sensor, but it also appears you need a more capable scan tool. NOx sensors are common to go bad on these trucks and can be quite pricey. NOx sensor data also needs to be reset if the sensor(s) is replaced. Login to read more.