how to fix P0301 code on Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during the repair.
• Allow the engine to cool down if it has been running.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
• Take out the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for signs of wear (e.g., carbon buildup, wear on the electrode).
• If necessary, replace the spark plug with a new one, ensuring it is gapped according to manufacturer specifications (typically 0.043 inches for Toyota).
• Reinstall the ignition coil over the new spark plug and reconnect the electrical connector.

3. Check and Replace Ignition Coil (if needed)

• If the ignition coil appeared faulty during the inspection, remove it from cylinder 1.
• Install a new ignition coil, ensuring it fits securely and reconnect the electrical connector.

4. Inspect and Replace Fuel Injector (if necessary)

• Remove the fuel rail if the injector is not accessible directly. This may require disconnecting fuel lines and electrical connectors.
• Check the injector for proper operation by performing a resistance test or using a noid light.
• If the injector is faulty, replace it with a new one.
• Reinstall the fuel rail and any components removed during the process.

5. Reassemble and Reconnect Battery

• Ensure all components are reinstalled correctly.
• Reconnect the battery terminal and torque it to the manufacturer’s specified value.