P1133 – Infiniti DTC

Infiniti DTC P1133 – H02S Insufficient Switching Bank 1 Sensor 1

DTC P1133 meaning on Infiniti

DTC P1133 refers to an OBD-II diagnostic trouble code that indicates an issue with the Heated Oxygen Sensor (HO2S) located in Bank 1 Sensor 1 of an Infiniti vehicle. This code specifically points to insufficient switching activity from the oxygen sensor.

Infiniti DTC P1133 symptoms

• Check Engine Light (CEL) illuminated on the dashboard
• Poor fuel economy
• Rough idling or engine misfires
• Reduced engine performance

Infiniti DTC P1133 causes

• Faulty Heated Oxygen Sensor (HO2S)
• Wiring or connector issues in the oxygen sensor circuit
• Exhaust system leaks
• Engine running too rich or too lean

Infiniti DTC P1133 seriousness

The DTC P1133 code should not be ignored as it can lead to decreased fuel efficiency and potential engine performance issues. While the vehicle may still be operable, it is recommended to address this problem promptly to prevent further damage.

How to diagnose DTC P1133 on Infiniti

1. Use an OBD-II scanner to retrieve the specific trouble code
2. Inspect the wiring and connectors related to Bank 1 Sensor 1
3. Check for exhaust leaks or other issues affecting the oxygen sensor
4. Perform a visual inspection of the sensor itself for any signs of damage

How to fix DTC P1133 on Infiniti

1. Replace the Bank 1 Sensor 1 Heated Oxygen Sensor (HO2S)
2. Repair any damaged wiring or connectors in the oxygen sensor circuit
3. Address any exhaust leaks or other issues affecting sensor performance
4. Clear the trouble code and reset the Check Engine Light

How to erase DTC P1133 on Infiniti

1. Use an OBD-II scanner to clear the trouble code
2. Alternatively, disconnect the vehicle’s battery for a few minutes to reset the ECU and clear the code
3. Ensure the underlying issue causing the DTC P1133 has been resolved before clearing the code

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