how to fix Toyota RAV4 Fourth Generation (2013-2018) misfire code P0301

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil connector from the ignition coil for cylinder 1.
3. Remove the ignition coil using a socket set.
4. Remove the spark plug using a spark plug socket.
5. Inspect the spark plug for wear or damage; replace if necessary.
6. Install a new spark plug with the recommended gap (check the owner’s manual for specifications).
7. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

1. If the spark plug is in good condition, test the ignition coil using a multimeter for primary and secondary resistance.
2. If the coil is faulty, remove the old ignition coil.
3. Install the new ignition coil, ensuring it is seated properly.
4. Reconnect the ignition coil connector.

4. Inspect Fuel Injector

1. If the issue persists, check the fuel injector for cylinder 1.
2. Remove the fuel injector connector.
3. Test the fuel injector resistance with a multimeter; replace if it is out of specification.
4. If necessary, replace the fuel injector by removing the fuel rail and replacing the injector with a new one.
5. Reconnect the fuel injector and ensure the fuel rail is secured.

5. Reassemble and Check

1. Reinstall any components removed for access (engine cover, etc.).
2. Reconnect the negative battery terminal.
3. Start the engine and allow it to idle while checking for any abnormal sounds or symptoms.