how to resolve the P0301 code in my Toyota RAV4 XA40 (2013-2018)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the engine to cool down before beginning work.

2. Replace Spark Plug

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil connector on cylinder 1.
3. Unbolt the ignition coil using a socket and remove it.
4. Use a spark plug socket to remove the spark plug.
5. Inspect the old spark plug for wear; if it is fouled or worn, replace it with a new one.
6. Install the new spark plug, ensuring it is torqued to the manufacturer’s specifications (typically around 13-15 lb-ft).
7. Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if necessary)

1. If the ignition coil is found to be faulty, remove it as described in the previous step.
2. Install the new ignition coil, ensuring it is seated properly.
3. Reconnect the ignition coil connector.

4. Clean or Replace Fuel Injector

1. If the fuel injector is suspected of being clogged, remove it using a socket set.
2. Clean the fuel injector with a suitable injector cleaner or replace it with a new one.
3. Reinstall the fuel injector and ensure all connections are secure.

5. Verify and Reassemble

1. Reconnect the negative battery cable.
2. Start the engine and check for any remaining misfire codes.
3. Allow the engine to reach operating temperature and monitor for smooth operation.