SPN 3490 FMI 7 Purge AIR ACTUATOR

[srsttrans]

(08-16-2020 )Waterloo Wrote:  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.

Yes I did service EGR lately. Replaced EGR cooler since it was leaking, cleaned all pipes and intake manifold. Boost pressure sensor. But never got to Def doser. Its good to know this fault related to def doser. It was actually giving me a fault about outlet nox sensor, but it was fmi 9 - reading incorrect. And Nox sensor fault may come up ad go away in a day. Thx for replay. Will service it asap