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DTC codes / P22xx · Fuel and air metering (injector circuits) / P2225
P2225 means the engine computer has detected an intermittent fault in the heater circuit for the nitrogen oxide (NOx) sensor on bank 2, sensor 1. The computer monitors the heater element's electrical current and sees it drop out or spike erratically, which prevents the sensor from reaching operating temperature reliably.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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