P0071 on Ford vehicles

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 P0071. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• SSM 46285 Service bulletin
  2016-12-23 · Equipment — Appliance — Air Conditioner
• SOME 2017 FUSION HEV/PHEV, C-MAX HEV/PHEV, AND MKZ HEV VEHICLES MAY EXHIBIT AN ILLUMINATED MIL WITH DTC P0071 AND/OR DEGRADED HVAC PERFORMANCE IN AUTOMATIC MODE ONLY WITH AN AMBIENT TEMPERATURE READING OF 50 DEGREES F DISPLAYED IN THE MESSAGE CENTER. IF AFTER PERFORMING NORMAL PINPOINT TEST DIAGNOSIS, A COMPONENT FAILURE IS NOT IDENTIFIED, DO NOT CONTINUE WITH FURTHER DIAGNOSIS OR PART REPLACEMENT
• SSM 46410 Service bulletin
  2017-02-23 · Equipment — Appliance — Air Conditioner
• SOME 2017 FUSION HEV/PHEV, C-MAX HEV/PHEV, AND MKZ HEV VEHICLES MAY EXHIBIT AN ILLUMINATED MIL WITH DTC P0071 AND/OR DEGRADED HVAC PERFORMANCE IN AUTOMATIC MODE ONLY WITH AN AMBIENT TEMPERATURE READING OF 50 DEGREES F DISPLAYED IN THE MESSAGE CENTER. IF AFTER PERFORMING NORMAL PINPOINT TEST DIAGNOSIS, A COMPONENT FAILURE IS NOT IDENTIFIED, DO NOT CONTINUE WITH FURTHER DIAGNOSIS OR PART REPLACEMENT
• TSB 17-2072 Service bulletin
  2017-04-21 · Engine
• Some 2017 C-MAX/Fusion Hybrid/Energi and MKZ Hybrid vehicles may exhibit an illuminated MIL with DTC P0071 stored in the powertrain control module (PCM). This DTC can be set after the vehicle is stored inside a warm location for several hours and then driven on a cold day. Under these conditions the PCM may see a temperature sensor concern when it first compares the ambient air temperature (AAT) s
• TSB 26-2006 Service bulletin
  2026-04-17 · Unknown Or Other
• Some vehicles listed in the model statement above may require the replacement of the ambient air temperature sensor for various concerns. DTCs P0071, P0072, and/or P0073 may be present in the powertrain control module (PCM).
• SSM 54781 Service bulletin
  2026-04-27 · Power Train
• Some 2021-2025 Bronco vehicles built on or before 09-Sep-2025 may require replacement of the ambient air temperature sensor for various concerns. Diagnostic trouble codes (DTC) P0071, P0072, and/or P0073 may be present in the powertrain control module (PCM). A concern has been identified in TSB 26-2006 that previously instructed replacement of the incorrect ambient air temperature sensor for the v
• TSB 26-2291 Service bulletin
  2026-06-19 · Unknown Or Other
• This bulletin supersedes 26-2006. Reason for update: update the Parts list to correct the ambient air temperature service part number. Some vehicles listed in the model statement above may require the replacement of the ambient air temperature sensor for various concerns. DTCs P0071, P0072, and/or P0073 may be present in the powertrain control module (PCM).
• TSB 25-2545 Service bulletin
  2026-01-07 · Power Train
• Some 2023-2025 F-Super Duty vehicles built on or before 14-Jun-2025 may require the replacement of the ambient air temperature (AAT) sensor for various concerns. DTCs P0071, P0072, and/or P0073 may be present in the powertrain control module (PCM).
• TSB 26-2251 Service bulletin
  2026-05-28 · Power Train
• This article supersedes TSB 25-2545. Reason for update: To correct the current Pinpoint Test description. Some of the vehicles listed in the Model statement above may require the replacement of the ambient air temperature sensor for various concerns. DTCs P0071, P0072, and/or P0073 may be present in the powertrain control module (PCM).
• TSB 26-2301 Service bulletin
  2026-06-30 · Electrical System
• Some of the vehicles listed in the Model statement above may require the replacement of the ambient air temperature sensor for various concerns. DTCs P0071, P0072, and/or P0073 may be present in the powertrain control module (PCM).
• TSB 26-2372 Service bulletin
  2026-08-13 · Electrical System
• This bulletin supersedes 26-2301. Reason for update: to update the Pinpoint Tests referenced in Step 1. Some of the vehicles listed in the Model statement above may require the replacement of the ambient air temperature sensor for various concerns. DTCs P0071, P0072, and/or P0073 may be present in the powertrain control module (PCM).

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.