![]() When this sensor goes bad or fails, it can trigger a P1401 and several other related codes (P040# variants, usually) and create a rough idle. ![]() The exhaust gas recirculation (EGR) valve has a differential pressure feedback sensor (DPFE). The TSB is merely documentation of a known issue and proper diagnoses and repair procedure. NOTE: The existence of a TSB does not mean that the manufacturer has acknowledged responsibility for a known problem, nor does it mean that the local dealership is required to fix the problem outlined in the TSB free charge. OBD II Codes P1401 – Differential Pressure Feedback Sensor (DPFE) Error (Ford) 19 Sep
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