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.
4-128 Powertrain DTC Charts and Descriptions
Diagnostic Trouble Code (DTC) Charts and Descriptions
P219E - Cylinder 3 Air Fuel Ratio Imbalance (Continued)
• External noise sources on the CKP circuit such as the charging circuit or aftermarket equipment
• Electrical noise on the CKP circuit from radio frequency interference or electro magnetic interference
• Low fuel pressure or running out of fuel
• Leaking EVAP purge valve
• Exhaust or intake air system leaks
• Exhaust gas recirculation (EGR) system
• Positive crankcase ventilation (PCV) system is leaking
• Incorrectly seated engine oil dipstick, tube or oil fill cap
• Base engine concerns
Diagnostic Aids: This DTC may be caused by other systems related to cylinder 3. Diagnose any other cylinder 3 related DTCs
first. The crankshaft position (CKP) sensor signal is very sensitive to electrical noise. Check the routing of the CKP sensor wiring harness.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test H.
P219F - Cylinder 4 Air Fuel Ratio Imbalance
Description: The air to fuel ratio imbalance torque monitor is designed to detect minimal differences in the air to fuel ratio
between cylinders. This DTC sets when the minimal air to fuel ratio difference in cylinder 4 is greater than a calculated amount.
Possible Causes: • Leaking or contaminated cylinder 4 fuel injector
• External noise sources on the CKP circuit such as the charging circuit or aftermarket equipment
• Electrical noise on the CKP circuit from radio frequency interference or electro magnetic interference
• Low fuel pressure or running out of fuel
• Leaking EVAP purge valve
• Exhaust or intake air system leaks
• Exhaust gas recirculation (EGR) system
• Positive crankcase ventilation (PCV) system is leaking
• Incorrectly seated engine oil dipstick, tube or oil fill cap
• Base engine concerns
Diagnostic Aids: This DTC may be caused by other systems related to cylinder 4. Diagnose any other cylinder 4 related DTCs
first. The crankshaft position (CKP) sensor signal is very sensitive to electrical noise. Check the routing of the CKP sensor wiring harness.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test H.
P21A0 - Cylinder 5 Air Fuel Ratio Imbalance
Description: The air to fuel ratio imbalance torque monitor is designed to detect minimal differences in the air to fuel ratio
between cylinders. This DTC sets when the minimal air to fuel ratio difference in cylinder 5 is greater than a calculated amount.
Possible Causes: • Leaking or contaminated cylinder 5 fuel injector
• External noise sources on the CKP circuit such as the charging circuit or aftermarket equipment
• Electrical noise on the CKP circuit from radio frequency interference or electro magnetic interference
• Low fuel pressure or running out of fuel
• Leaking EVAP purge valve
• Exhaust or intake air system leaks
• Exhaust gas recirculation (EGR) system
• Positive crankcase ventilation (PCV) system is leaking
• Incorrectly seated engine oil dipstick, tube or oil fill cap
• Base engine concerns
Diagnostic Aids: This DTC may be caused by other systems related to cylinder 5. Diagnose any other cylinder 5 related DTCs
first. The crankshaft position (CKP) sensor signal is very sensitive to electrical noise. Check the routing of the CKP sensor wiring harness.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test H.
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.