This may be the wrong spot for this but I am an owner operator with a 2016 pete with an mx 13 paccar motor. It has given me the code spn 3490, fmi 4, dpf purge air actuator. I am hoping for some help/information on this issue. Thank you all very much.
Without getting into detail. 1/4" air line driver side of the engine back side of the engine fuel filter. Remove the air line and be sure of constant air supply when at pressure. If no pressure you likely need an air dryer. If air is good, I would replace the solenoid the air line goes to. DPF air purge actuator. Attempt to drive to regen or run a stationary to see if the fault clears. Next suspect would be a leaking or failed fuel doser injector from there. If you need or require more specific details, please ask.
