Ford F250 P0400: Meaning, Causes, + Diagnosis | Drivetrain …
Apr 06, 2022 · Ford F250 P0400: Meaning, Causes, + Diagnosis. April 6, 2022 by Jason. P0400 is a standard code that indicates your Ford F250’s EGR system is not working. The good news is that this code is not a breakdown risk and should not affect how your F250 runs (assuming it’s the ONLY code). P0400 is a generic code, which means it has the same definition for the F250 as any other vehicle.
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