P219B - Bank 2 Air/Fuel Ratio Imbalance

Powertrain DTC Charts and Descriptions 4-127

Diagnostic Trouble Code (DTC) Charts and Descriptions

P219B - Bank 2 Air/Fuel Ratio Imbalance (Continued)

• Positive crankcase ventilation (PCV) system is leaking

• Ignition system

• Incorrectly seated engine oil dipstick, tube or oil fill cap

• Base engine concerns

• Damaged universal heated oxygen sensor bank 2, sensor 1 (HO2S21)

Diagnostic Aids:

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test H.

P219C - Cylinder 1 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 1 is greater than a calculated amount.

Possible Causes: • Leaking or contaminated cylinder 1 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 1. Diagnose any other cylinder 1 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.

P219D - Cylinder 2 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 2 is greater than a calculated amount.

Possible Causes: • Leaking or contaminated cylinder 2 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 2. Diagnose any other cylinder 2 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.

P219E - Cylinder 3 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 3 is greater than a calculated amount.

Possible Causes: • Leaking or contaminated cylinder 3 fuel injector

2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015