Circuit Description
WARNING: This page is about a different car, the 2003 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.
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 1 sensor 1. P0153 is for bank 2 sensor 1. DTC will set when engine is warm and idling and 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.
- Improper fuel system pressure.
- Faulty fuel injectors.
- Faulty ECM.