how to fix P0442 code in Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the negative battery terminal.

2. Inspect and Replace Gas Cap

• Tools Required: None
• Inspect the gas cap for damage; replace if necessary.
• Tighten the gas cap until it clicks to ensure a proper seal.

3. Replace Damaged EVAP Hoses

• Tools Required: Socket set, pliers
• Locate the damaged EVAP hoses identified during the visual inspection.
• Use pliers to disconnect the hoses from the EVAP system components.
• Cut new hoses to the correct length and connect them securely, ensuring no kinks or bends.

4. Perform Smoke Test

• Tools Required: Smoke machine
• Connect the smoke machine to the EVAP service port.
• Activate the smoke machine to pressurize the system and visually inspect for smoke escaping, indicating leaks.
• Seal any identified leaks with appropriate patches or sealants.

5. Replace EVAP Purge Valve (if necessary)

• Tools Required: Socket set
• Locate the EVAP purge valve (usually near the intake manifold).
• Disconnect the electrical connector and the vacuum lines from the valve.
• Remove the mounting bolts and take out the valve.
• Install the new purge valve and reconnect the vacuum lines and electrical connector.

6. Clear Codes and Test Drive

• Tools Required: OBD-II scanner
• Use the OBD-II scanner to clear the P0442 code.
• Start the vehicle and conduct a test drive to ensure the issue is resolved and no codes reappear.