P204F

HinoRich

Active Expediter
Owner/Operator
I own a 2017 268 with 118000KMS on it. About a month ago, the CEL came on (P204F) is what is coming up on the dash, when I scroll through active codes. It has been intermittent then came back on and its been on for 2 weeks now. My local Hino dealer is backed up right now as the 1 Hino mechanic works his own hours, I know it sounds like quite a job, huh?usually 2 or 3 days a week...
The truck runs as usual, regular regens, no derate or anything. Could this be a bad sensor or bad DEF? Either one should make it run rough or unusual I would think?
 
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