how to clear a P0301 code in my Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Use a socket set to unscrew the bolts securing the coil.
  • Gently pull the coil straight out.
• Remove the spark plug:
  • Use a spark plug socket to unscrew the spark plug from cylinder 1.
• Inspect the spark plug for wear and carbon buildup; replace if necessary.
• Install a new spark plug, ensuring to torque it to the manufacturer's specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil, ensuring it is seated properly and the bolts are secured.

3. Check and Replace Ignition Coil (if needed)

• If the ignition coil shows signs of damage or if the spark plug was not the issue, replace the ignition coil:
  • Disconnect the electrical connector from the ignition coil.
  • Remove the coil as previously described.
  • Install the new ignition coil and reconnect the electrical connector.

4. Inspect and Replace Fuel Injector (if necessary)

• If the issue persists, test the fuel injector:
  • Disconnect the fuel injector connector.
  • Use a multimeter to test for resistance; compare it to the manufacturer's specifications.
• If the injector is faulty, replace it by:
  • Removing the fuel rail (ensure fuel pressure is released prior).
  • Installing a new injector and reassembling the fuel rail.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 code from the system.