I got that error too. My MT342H started with that one, then saw a 5202 F11 code not long after. The wiring harness was for the wrong tractor. However, that didn’t fix it. I posted on a thread here by another member titled “issue already”. Look there. We both had the same error. His was fixed, mine not.
Repaired and back home. No problems, covered under warranty. A seal at the turbo was leaking allowing oil into the exhaust system, creating the code.
Let them do the 50 hour service as well. Very pleased with the prices and turn around time. Great attitude from the dealer.
The only thing they couldn't do is replace the HST filter, said it was on back order, scheduled to be in next week. Said they would come out and install it when it came in.