Get the app
Quick access from your home screen.
DTC codes / P22xx · Fuel and air metering (injector circuits) / P22AC
P22AC indicates that the powertrain control module (PCM) has detected a low current condition on the positive current control circuit for the downstream oxygen sensor on bank 1, which is sensor 2. The PCM commands a specific current to the sensor's heater or pump cell and monitors the circuit for expected feedback; when the current falls below the calibrated threshold, this code is stored.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
Get the app
Quick access from your home screen.