how to fix the P0301 misfire code on my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Ensure the engine is cool to avoid burns.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Carefully pull out the spark plug using a spark plug socket and ratchet.
• Inspect the old spark plug for wear; if necessary, clean the spark plug hole.
• Install the new spark plug, ensuring it is gapped correctly according to the manufacturer's specifications (typically 0.043 inches for Toyota).
• Torque the spark plug to the manufacturer-recommended specifications (usually about 13 lb-ft).

3. Replace Ignition Coil (if needed)

• If the ignition coil tests faulty, replace it with a new one.
• Install the new ignition coil by reversing the removal process.
• Reconnect the electrical connector and secure the coil with the retaining bolts.

4. Inspect and Clean Fuel Injector (if needed)

• If fuel injector issues are suspected, remove the fuel rail and inspect the injector for clogs.
• Clean the injector using a specialized fuel injector cleaner or replace it if necessary.
• Reinstall the fuel rail and reconnect all hoses and electrical connectors.

5. Check Compression (if needed)

• If compression is low, inspect for valve issues or head gasket failure.
• If necessary, perform repairs based on the findings (this may require further disassembly and parts).