how to fix B1242 code in Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on the electrical system.

2. Inspect and Replace the Refrigerant Pressure Sensor

• Tools Required: Wrench set, O-ring pick, vacuum pump, refrigerant gauge set.
• Locate the refrigerant pressure sensor on the AC line.
• Disconnect the electrical connector from the sensor.
• Using the appropriate wrench, remove the sensor from the AC line.
• Inspect the O-ring for wear or damage; replace if necessary.
• Install the new refrigerant pressure sensor and tighten to the manufacturer's torque specifications (typically around 15 ft-lbs, but verify with service manual).
• Reconnect the electrical connector, ensuring a secure fit.

3. Recharge the AC System

• Tools Required: Vacuum pump, refrigerant gauge set.
• Connect the refrigerant gauge set to the AC service ports.
• Use the vacuum pump to remove any air and moisture from the system for at least 30 minutes.
• Recharge the AC system with the correct amount of refrigerant as specified in the owner's manual (typically R-134a).
• Monitor the pressure gauges to ensure they are within the normal operating range.

4. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the vehicle and turn on the AC system to check for proper operation.
• Monitor the system for any unusual noises or leaks.