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Tinytink72 · 04-30-2023, **(Subject: Code 4796 fmi 31 )**

Does anyone have suggestions for what to do with this code? It appeared after doing regen. The truck is a 2019 international lt625

SquareOne · 04-30-2023, **(Subject: Code 4796 fmi 31 )**

(04-30-2023 )Tinytink72 Wrote: Does anyone have suggestions for what to do with this code? It appeared after doing regen. The truck is a 2019 international lt625

Fault code - 1664
Lamp color - Amber
Definition - After-treatment 1 Diesel Oxidation Catalyst Missing - Condition Exists

This is the definition according to Cummins quickserve. Whats the mileage/hours on the engine? We'll need more info on the truck and it's application to help further.

Rawze · 04-30-2023, **(Subject: Code 4796 fmi 31 )**

start with a thorough EGR tune-up and ensure there are no exhaust leaks etc.

Things like replacing the IMAP sensor, Cleaned out the EGR piping and valve.. replaced the EGR Delta-P and other related sensors?

Anyone bother to clean the Doser Injector tip and inspect it for seepage?

How about mileage, etc?.. what kind of mileage is on those DOC/DPF cans? . When is the last time someone pulled them off and had them baked, de-ashed, and flow-tested?

-- Its called preventative maintenance for a reason. The DPF system does not make soot... it collects it. You must service the engine by doing tune-up work to it in order to keep those exhaust systems happy.