Note. Bank No. 1 refers to bank that includes cylinder No. 1. Bank No. 2 refers to bank without cylinder No. 1. Sensor No. 1 refers to sensor closest to engine block.
Circuit Description
The oxygen sensor monitors exhaust gas oxygen content and delivers an input signal to ECM. ECM uses this input signal to determine fuel injection system operation. Sensors include heater.
DTC P0133 is for bank No. 1, sensor No. 1. P0153 is for bank No. 2, sensor No. 1. DTC is set when engine is warmed up and is idling, ECM detects a response time of 1.1 seconds or more for sensor to change from rich to lean, or lean to rich. Possible causes are
- Open or short in oxygen sensor circuit.
- Faulty heated oxygen sensor.
- Air induction system fault.
- Fuel system pressure fault.
- Fuel injectors.
- Faulty ECM.
Diagnostic Aids
Using scan tool, read freeze frame data. Freeze frame records engine conditions when malfunction is detected.