what does the B1491 code mean for my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the negative terminal of the battery to avoid electrical shock.

2. Remove Ambient Temperature Sensor

• Locate the ambient temperature sensor, typically found near the front grille or in the front bumper area.
• Carefully disconnect the sensor's electrical connector.
• Remove the sensor from its mounting bracket, typically secured with a clip or screw.

3. Inspect and Replace

• Visually inspect the old sensor for any physical damage or corrosion.
• If the sensor is faulty, replace it with a new one (ensure the new sensor is compatible with the 2019-2024 RAV4).
• Install the new ambient temperature sensor in the reverse order of removal, ensuring it is securely attached.

4. Reconnect Battery

• Reconnect the negative terminal of the battery.
• Ensure all tools are removed from the engine bay and components are reassembled properly.

5. Clear Fault Codes

• Use the OBD-II scanner to clear the B1491 code from the vehicle’s computer.
• Start the vehicle and observe if the check engine light remains off.