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DTC P219A

DTC P219A

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptor

DTC P219A

Air Fuel Imbalance

Circuit/System Description

The Air Fuel Imbalance diagnostic detects a rich or lean cylinder to cylinder air/fuel ratio imbalance. The diagnostic monitors the pre-catalyst heated oxygen sensor (HO2S) signal's frequency and amplitude characteristics by calculating an accumulated voltage over a predetermined sample period. An imbalance is indicated when multiple samples of the accumulated voltage are consistently higher than the desired value.

Conditions for Running the DTC


• DTCs P0030, P0053, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0125, P0128, P0131, P0132, P0133, P0134, P0135, P0178, P0179, P0201-P0204, P0261-P0262, P0264-P0265, P0267-P0268, P0270-P0271, P0300, P0301-P0304 P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P1133, P1248, P1249, P124A, P124B, P2147-P2148, P2150-P2151, P2153-P2154, P2156-P2157, P2269, P2A00 are not set.

• The device controls are not active.

• The intrusive diagnostics are not active.

• The engine overspeed protection is not active.

• The traction control is not active.

• Reduced engine power is not active.

• The engine is in Closed Loop status.

• The fuel ethanol concentration is less than 88 %.

• The system voltage is between 10-32 V for more than 4 s.

• The engine coolant temperature (ECT) is warmer than -20°C (-4°F).

• The engine speed is between 500-4,300 RPM.

• The mass air flow is between 6-600 g/s.


Conditions for Setting the DTC

Multiple samples of the pre-catalyst HO2S accumulated voltage are consistently greater than the desired value.

Action Taken When the DTC Sets

DTC P219A is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P219A is a Type B DTC.

Diagnostic Aids


• The air fuel imbalance diagnostic is very sensitive to heated oxygen sensor (HO2S) design. A non-OE sensor or an incorrect part number may cause a DTC to set.

• Monitoring the misfire current counters, or misfire graph, may help to isolate the cylinder that is causing the condition.

• Certain aftermarket air filters may cause a DTC to set.

• Certain aftermarket air induction systems or modifications to the air induction system may cause a DTC to set.

• Certain aftermarket exhaust system components may cause a DTC to set.


Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference


• Circuit Testing

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs

• Connector Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing


1. Read and record the Freeze Frame/Failure Records data taking note of the speed and load at which the DTC set.

2. Diagnose any other DTCs that are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

3. With the engine idling and the transmission in Park or Neutral position, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor parameter should be between 20 kPa and 48 kPa.

4. If the MAP sensor parameter is not between 20-48 kPa, refer to DTC P0106 .

5. Inspect the air induction system for modified, damaged, leaking, or restricted components.

6. Inspect the crankcase ventilation system for improper operation.

7. Inspect the vacuum hoses for splits, kinks, and improper connections.

8. Test for a restricted, damaged, leaking, or modified exhaust system from the catalytic converter forward. Refer to Symptoms - Engine Exhaust .

9. Test the fuel injectors for improper operation. Refer to Fuel Injector Solenoid Coil Test .

10. Test the fuel for contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .

11. Test for excessive fuel in the crankcase due to leaking injectors.

12. Test the ignition system for improper operation. Refer to Electronic Ignition System Diagnosis .

13. Test the engine for any mechanical conditions such as sticking valves, lifters, etc., which could alter the flow into the combustion chamber. Refer to Symptoms - Engine Mechanical .


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verify the repair under the same speed and load as noted in the Freeze Frame/Failure Records data recorded during testing.