Toyota DTC P1133 – Air/Fuel Sensor Circuit Response (Bank 1 Sensor 1)
DTC P1133 meaning on Toyota
DTC P1133 for Toyota refers to the Air/Fuel Sensor Circuit Response for Bank 1 Sensor 1. This diagnostic trouble code indicates an issue with the air/fuel sensor circuit’s response on the first bank of the engine.
Toyota DTC P1133 symptoms
- Check Engine Light (CEL) illuminated
- Poor fuel economy
- Engine running rough
- Decreased engine performance
Toyota DTC P1133 causes
- Faulty air/fuel sensor
- Wiring or connector issues in the sensor circuit
- Exhaust leaks affecting sensor readings
- Engine running too rich or too lean
Toyota DTC P1133 seriousness
The seriousness of DTC P1133 lies in its impact on engine performance and fuel efficiency. Ignoring this code can lead to further damage to engine components and increased emissions.
How to diagnose DTC P1133 on Toyota
- Use an OBD-II scanner to retrieve the trouble codes
- Inspect the air/fuel sensor and its wiring for any visible damage
- Check for exhaust leaks near the sensor
- Perform a voltage test on the sensor circuit
How to fix DTC P1133 on Toyota
- Replace the faulty air/fuel sensor
- Repair any damaged wiring or connectors in the sensor circuit
- Fix any exhaust leaks affecting sensor readings
- Reset the ECU after making repairs
How to erase DTC P1133 on Toyota
- Use an OBD-II scanner to clear the trouble codes
- Alternatively, disconnect the battery for a few minutes to reset the ECU
- Ensure the issue causing the DTC has been resolved before clearing the code
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