DTC P2255: General Description
The front air/fuel ratio (A/F) sensor (bank 2, sensor 1) is installed in the exhaust manifold and detects oxygen content in the exhaust gas. The front A/F sensor (bank 2, sensor 1) transmits a signal to the powertrain control module (PCM), and the PCM controls fuel injection duration by comparing the target air/fuel ratio with the front A/F sensor (bank 2, sensor 1) signal. When the self diagnosis function in the PCM detects a short circuit failure, the heater stops, and if the condition continues for a specified time, or if the VSB2 terminal voltage is a specified value after a current is applied to the pump cell for a specified time, the PCM detects VSB2 line short to ground and stores a DTC.