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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow engine to cool down before working.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts and disconnecting the electrical connector.
• Unscrew the spark plug using a spark plug socket.
• Inspect the old spark plug for damage; replace with a new one if necessary.
• Torque the new spark plug to the manufacturer’s specification (typically around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set
• If misfire persists after replacing the spark plug, remove the ignition coil from cylinder 1.
• Install a new ignition coil compatible with the vehicle.
• Reconnect the electrical connector and ensure the coil is securely mounted.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaner or replacement injector, basic hand tools
• If the injector is suspected to be clogged, use a fuel injector cleaning kit following the manufacturer’s instructions.
• If cleaning does not resolve the issue, replace the fuel injector for cylinder 1.
• Reinstall and ensure all connections are secure.

5. Conduct Compression Test (if necessary)

• Tools Required: Compression tester
• If the misfire continues, perform a compression test on cylinder 1.
• If compression is below specifications, further engine diagnostics may be needed (valve issues, head gasket, etc.).