P0402 on Ford vehicles Too much exhaust gas is being recirculated

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Bulletins and campaigns Ford filed with NHTSA whose summary names P0402. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• SSM 46115 Service bulletin
  2016-10-06 · Engine
• SOME 2017 F-SUPER DUTY VEHICLES EQUIPPED WITH A 6.7L ENGINE MAY EXHIBIT AN ILLUMINATED MIL WITH DTC P0402 IN THE POWERTRAIN CONTROL MODULE (PCM). WHEN PERFORMING PINPOINT TEST W IN THE POWERTRAIN CONTROL/EMISSIONS DIAGNOSIS (PC/ED) MANUAL, IF DIRECTED TO PERFORM STEP W10, DISREGARD AND PROCEED TO STEP W11. INTEGRATED DIAGNOSTIC SYSTEM (IDS) CURRENTLY DISPLAYS INCORRECT DATA FOR PIDS EGR_A_ACT (PER
• TSB 16-0152 Service bulletin
  2016-11-02 · Power Train — Automatic Transmission — Control Module (Tcm/Pcm/Tecm)
• SOME 2017 F-SUPER DUTY VEHICLES EQUIPPED WITH A 6.7L ENGINE BUILT ON OR BEFORE 24-OCT-2016 MAY EXHIBIT DTC P0402 IN THE POWERTRAIN CONTROL MODULE (PCM). THIS MAY BE DUE TO A MASS AIR FLOW (MAF) SENSOR ADAPTION FEATURE WHICH HAS NOT YET LEARNED THE APPROPRIATE VALUES FOR THE VEHICLE OPERATING CONDITION. FOLLOW THE SERVICE PROCEDURE STEPS TO CORRECT THE CONDITION.
• TSB19-2160 Service bulletin
  2019-05-22 · Power Train — Automatic Transmission — Control Module (Tcm/Pcm/Tecm)
• Some 2017-2019 F-Super Duty vehicles equipped with a 6.7L engine built on or before 9-Jan-2019 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P2074, P0401, P0402 and/or P0170. This may be due to various strategies within the powertrain control module (PCM) software. To resolve this condition, follow the Service Procedure steps to reprogram the PCM
• TSB 19-2271 Service bulletin
  2019-09-06 · Engine And Engine Cooling
• Some 2017-2019 F-Super Duty vehicles equipped with a 6.7L engine built on or before 9-Jan-2019 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P2074, P0401, P0402 and/or P0170. This may be due to various strategies within the powertrain control module (PCM) software. To resolve this condition, follow the Service Procedure steps to reprogram the PCM
• TSB 19-2343 Service bulletin
  2019-11-18 · Power Train
• This message is superseding TSB 19-2271 to update the Issue, Action and Service Procedure. Some 2017-2018 F-Super Duty and 2019 F-Super Duty F-450/F-550 Chassis Cab only vehicles equipped with a 6.7L engine built on or before 9-Jan-2019 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P2074, P0401, P0402 and/or P0170. This may be due to various strat
• TSB 22-2493 Service bulletin
  2022-12-16 · Power Train
• Some 2022 Maverick vehicles equipped with a 2.5L full hybrid electric vehicle (FHEV) powertrain may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0402 stored in the powertrain control module (PCM) or brakes grab during light braking at or below 6.2 mph (10 km/h). This may be due to the software in the anti-lock brake system (ABS) module. To correct thi
• TSB 23-2059 Service bulletin
  2023-02-23 · Electrical System
• Some 2022 Maverick vehicles equipped with a 2.5L full hybrid electric vehicle (FHEV) powertrain may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0402 stored in the powertrain control module (PCM). This may be due to fault detection ratio threshold of the differential pressure feedback exhaust gas recirculation (EGR) sensor. To correct the condition, f

A stored code names the test that failed, never the part that caused it. The record above is what Ford and its owners have filed about it; the code’s page across every make has the whole file.