SPN 3490 FMI 7 Purge AIR ACTUATOR

[Waterloo]

I looked up that code and it directed me to the SCR Doser, have you serviced the SCR system lately? There is a filter cartridge in the system too that needs to be changed out periodically...

Those SCR dosers can crystalize up and do need to be changed out periodically, along with the exhaust fuel doser. Have you ever given this truck an EGR Tuneup?

Is the truck regenerating properly, do you have Insite and an Inline reader? If not, you need one NOW.