what does code B1421 mean for my Toyota Camry XV70 (2018-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety.
• Allow the vehicle to cool down if it has been operating.

2. Inspect and Repair Wiring

• Sub-steps:
  1. Remove the under-dash panel to access the A/C temperature sensor.
  2. Visually inspect the wiring harness for any signs of wear, fraying, or corrosion.
  3. Repair or replace any damaged wiring as needed.

3. Replace the A/C Temperature Sensor

• Tools Required: Socket set, torque wrench, electrical contact cleaner.
• Sub-steps:
  1. Locate the A/C temperature sensor, usually found near the evaporator unit.
  2. Disconnect the electrical connector from the sensor.
  3. Remove the sensor using the appropriate socket size.
  4. Install the new A/C temperature sensor, ensuring it is properly seated.
  5. Reconnect the electrical connector securely.

4. System Recharge and Test

• Sub-steps:
  1. Use a manifold gauge set to check and recharge the A/C system to the manufacturer’s specifications.
  2. Start the engine and turn on the A/C to its maximum setting.
  3. Monitor for proper operation and check if the B1421 code reappears.