General Information

Engine Control
P2196 HO2S Signal Stuck Rich (Bank 1 / Sensor 1) - General Information

Component Location





General Description

The linear O2 sensor is mounted on the front side of the Catalytic Converter (warm-up catalytic converter) or in the front exhaust pipe. It detects a wide range of air/fuel ratios in the exhaust gas from the rich to lean regions. This linear O2 sensor produces a current that corresponds to a specific air/fuel ratio. The PCM monitors this signal and determines whether the air/fuel mixture is rich or lean. The PCM constantly monitors the linear O2 sensor and increases or decreases the fuel injection duration using this signal. This is called closed-loop fuel control operation.

DTC Description

The PCM monitors the sensor characteristic line of front HO2S signal and sets DTC P2196 if the sensor charicteristic line has a shift to rich. If the same error code is set in the next driving cycle, the PCM illuminates the MIL.

DTC Detecting Condition





Schematic Diagram





Signal Waveform