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.
| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. |
Circuit Description
The oxygen sensor monitors exhaust gas oxygen content and delivers an input signal to ECM. The ECM uses this input signal to determine fuel injection system operation. Sensors include heater. DTC P1133 and P1153 are set when, after engine has reached operating temperature and vehicle is driving at 38 MPH or more with engine speed of 1400 RPM or more, oxygen sensor response characteristics become deteriorated. Possible causes are
- Heated Oxygen Sensor