1. Check Air Fuel Sensor:
- Locate the Air Fuel Sensor (usually near the exhaust manifold).
- Inspect the sensor for any physical damage, like cracks or discoloration.
- Check the sensor connector to ensure there are no loose connections or corrosion.
2. Test Air Fuel Sensor Voltage:
- You will need a multimeter for this step.
- Set your multimeter to read DC volts.
- Disconnect the Air Fuel Sensor connector.
- Touch one multimeter lead to the signal wire of the sensor connector (typically a black wire) and the other to the ground.
- Monitor the voltage reading.
- Normally, the voltage reading should fluctuate between 0.2-1.0 volts when the engine is idling.
3. Inspect Wiring and Connectors:
- Look for any damaged or loose wiring related to the Air Fuel Sensor.
- Check the connections to the vehicle's Engine Control Unit (ECU) to make sure they are tight.
- Clean any corrosion from the wiring or connectors using electrical contact cleaner.
4. Replace Air Fuel Sensor:
- If the sensor voltage reading is incorrect, or if there are visible signs of damage, replace the Air Fuel Sensor.
- Follow the specific instructions provided in your vehicle's repair manual for replacing the sensor.
5. Reset Trouble Code:
- Once you have replaced the sensor, or resolved any other issues, reset the trouble code P1150 by disconnecting the vehicle's battery for a few minutes.
After performing these steps, start your vehicle and check if the P1150 code has cleared. If it persists or if the Check Engine Light remains illuminated, it's recommended to have your vehicle diagnosed by a professional mechanic or Toyota dealership to further identify and resolve the underlying cause.
