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DTC codes / P26xx · Computer and output circuits / P2627
P2627 means the engine computer has detected that the electrical current trim signal for the oxygen sensor's pumping circuit on Bank 1 Sensor 1 is lower than expected. This sensor is a wideband air-fuel ratio sensor that uses a pump cell to balance oxygen ions, and the trim circuit fine-tunes that pumping current; a low reading tells the computer the circuit is not drawing enough current, which can skew the air-fuel ratio feedback.
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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