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P219A Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

Definition

P219A is an OBD-II Code that refers to Bank 1 Air/Fuel Ratio Imbalance

Meaning

A P219A code is a generic diagnostic trouble code (DTC) refers to the air fuel imbalance monitor that is designed to detect differences in the air fuel ratio between cylinders per engine bank. The test fails if the air fuel ratio difference per cylinder is greater than a calculated amount and the code is set.

Causes

Common causes for this code include:

  • Leaks in the exhaust or intake air system
  • Positive crankcase ventilation (PCV) system is leaking or the valve is stuck open
  • Running out of fuel or Low fuel pressure 
  • Leakage of the EVAP canister purge valve
  • The Ignition system
  • Fuel injectors that are leaking or contaminated
  • Exhaust gas recirculation (EGR) system
  • Oil dipstick, tube, or oil fill cap that is not properly installed

Symptoms

Common causes for this code include:

  • Leaks in the exhaust or intake air system
  • Positive crankcase ventilation (PCV) system is leaking or the valve is stuck open
  • Running out of fuel or Low fuel pressure 
  • Leakage of the EVAP canister purge valve
  • The Ignition system
  • Fuel injectors that are leaking or contaminated
  • Exhaust gas recirculation (EGR) system
  • Oil dipstick, tube, or oil fill cap that is not properly installed

Diagnosis

To diagnose a P219A DTC code, a technician would:

  1. Scan for codes in the ECM and look at the freeze frame data. P219A is usually accompanied by other trouble codes, which can really help with diagnosing it.
  2. Check the fuel pressure, PCV system operation. 
  3. Inspect the throttle position sensor and take a look at the exhaust and see if there are any soot marks where the exhaust is escaping.
  4. Check for leaks in the EVAP system
  5. Perform a visual inspection of hoses, wiring, and components, specifically inspect the Oxygen Sensor Wiring
  6. If any of the above tests or swap tests suggest that one or more components are faulty then they should be replaced/repaired as needed so that this code does not return.

Common mistakes

The following are some of the most common mistakes that a technician may make when diagnosing a P219A code:

  • Not checking the freeze frame data to determine the conditions under which the DTC was set.
  • Not checking the documents for the vehicle to ensure that the code is correct and not a different code.
  • Using diagnosis equipment that does not properly interpret the DTCs and advise them of their scan results.
  • Not performing all tests or swap tests necessary to determine what components are faulty. It may be easy to identify one or two components that are faulty but to really ensure the diagnosis, every test should be done.
  • Before replacing any components or parts, always check that they are compatible with the vehicle.

How serious is this?

A P219A code is considered to be serious if it indicates that one or more of the components is faulty. This code will not cause any immediate engine damage, but the next time the engine fails to start, it may be due to this same fault. The vehicle should be serviced as soon as possible.

What repairs can fix the code?

Repair manualsRepair manuals

The following are solutions that may fix this problem:

  • Inspect the fuel injectors for leakage, cracks, holes or other damage.
  • Inspect the PCV valve and hoses Inspect all vacuum lines to ensure that they are not damaged or leaking.
  • Check for a faulty EVAP canister purge valve
  • Check the exhaust system for any leaks.
  • Inspect the oxygen sensor wiring and inspect all sensors for damage,  looseness of connections or corrosion.
  • Check the throttle position sensor wiring connections to make sure they are tight and not corroded.
  • Check the power supply to the TPS by checking for any breaks in wires, loose connections or corrosion.
  • Check the air fuel ratio between cylinders by looking at the oxygen sensor data.
  • Check all vacuum switching valves for leaks and damage.
  • Replace or change any wiring or sensors that you may deem damaged or faulty.

Related codes

A P219A is related to and may be accompanied by the following codes:

P0491 – Evaporative Emission Control System Incorrect Purge Flow

P0505 – Injector Circuit/Open – Cylinder 5

P1294 – Fuel Level Signal Circuit Malfunction

Conclusion

In conclusion, the P219A code is a diagnostic trouble code that refers to a specific component on the engine. This code does not mean that there is a completely faulty part on the engine, but rather it suggests that one or more components has failed or is faulty. A technician should check for any of these related trouble codes as well as perform all proper tests to ensure that none of the components are further damaged before replacing them.