Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
4-12 Powertrain DTC Charts and Descriptions
Diagnostic Trouble Code (DTC) Charts and Descriptions
P0041 - Oxygen Sensor Signals Swapped Bank 1 Sensor 2/Bank 2 Sensor 2
Description: The heated oxygen sensor (HO2S) monitor determines if the HO2S signal response for a fuel shift corresponds
to the correct engine bank. This DTC sets when there is no response from the HO2S being tested.
Possible Causes: • Crossed HO2S harness connectors
• Crossed HO2S wiring at the harness connectors
• Crossed HO2S wiring at the PCM connectors
Diagnostic Aids: Connect the HO2S connector to the correct bank.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DW.
P0050 - HO2S Heater Control Circuit (Bank 2, Sensor 1)
Description: The PCM controls the universal heated oxygen sensor bank 2, sensor 1 (HO2S21) heater ON and OFF duty
cycle to maintain a calibrated temperature. This DTC sets when the sensor does not warm up to the required temperature in a calibrated amount of time. This DTC also sets when the PCM is not able to maintain the required temperature after the sensor is warm.
Possible Causes: • UO2S21 circuit open
• UO2SGREF21 circuit open
• UO2SHTR21 circuit open
• UO2SHTR21 circuit short to voltage
• VPWR circuit open
• Incorrect connections
• Damaged or corroded pins
• Exhaust temperature significantly higher than expected
• Damaged universal HO2S21
Diagnostic Aids: Inspect the connectors for signs of damage, water intrusion or corrosion.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DZ.
P0053 - HO2S Heater Resistance (Bank 1, Sensor 1)
Description: This DTC sets when the heater current requirements are too low or too high in the UO2SHTR11 circuit (if
equipped) or HTR11 circuit (if equipped).
Possible Causes: • VPWR circuit open
• UO2SHTR11 circuit open (if equipped)
• UO2SHTR11 circuit short (if equipped)
• HTR11 circuit open (if equipped)
• Damaged universal heated oxygen sensor bank 1, sensor 1 (HO2S11) (if equipped)
• Damaged HO2S11 (if equipped)
Diagnostic Aids: Inspect the connectors for signs of damage, water intrusion or corrosion.
Application Key On Engine Off Key On Engine Running Continuous Memory
KA GO to Pinpoint Test DW.
All others GO to Pinpoint Test DZ.
P0054 - HO2S Heater Resistance (Bank 1, Sensor 2)
Description: This DTC sets when the heater current requirements are too low or too high in the HTR12 circuit.
Possible Causes: • VPWR circuit open
• HTR12 circuit open
• HTR12 heater circuit short
• Damaged HO2S12 heater
Diagnostic Aids: Inspect the connectors for signs of damage, water intrusion or corrosion.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DW.
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.