DTC P2237-00: O2 Sensor Pumping Current Circuit/Open (Bank 1 / Sensor 1): General Description: 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 ECM monitors this signal and determines whether the air/fuel mixture is rich or lean. The ECM 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.