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Discussion Starter · #1 ·
hello im looking for a solution to a p0421 atc not up to temp code, i work on a fleet og hino 268s and a few of them seem to consistently get p0421, trucks always have to light on the dash but an inactive code, i reqad that there was some faulty units that will get false readings for this code, if anyone else has any similar experiences please reach out
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