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P219A: Bank 1 Air-Fuel Ratio Imbalance
The PCM sees an air-fuel imbalance among cylinders on bank 1.
Common causes
- Injector imbalance
- Vacuum leak
- Ignition misfire
- Mechanical compression difference
This free page explains the code. A Shop Brief adapts the next steps to your year, make, model, and full code stack.
Related codes:
P0171P0300P2096 Pricing Sample brief