code 3251.0

[Bengy88]

That code won’t clear without a successful regen with good readings across the board. I had an isl come in last week with this code accompanied by a 1922 and 1921. Dpf and doc cleaned and tested, tubes cleaned, and new differential pressure sensor before I tried anything…. This should be a rule of thumb.

After that I performed a reset then a regen. Regen was near perfect other than taking 1.5 hours and temps taking too long to reach specifications but code still went away, till I drove it….. you know that egr tune up thing we keep talking about? Had to do one for everything to work as it should. Do yourself a favor and start where Rawze said and clean your egr on top of it