how can I fix the P0301 misfire code on my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts.
• Pull the ignition coil straight out, being careful not to damage the connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear or damage; replace if needed.
• Install the new spark plug, torquing it to the manufacturer’s specification (typically around 13-15 lb-ft).
• Reinstall the ignition coil, ensuring it is seated properly.

3. Check and Replace Ignition Coil

• If the spark plug is fine, check the ignition coil for continuity using a multimeter.
• If faulty, replace the ignition coil with a new one.
• Ensure the new coil is compatible with the vehicle's specifications.

4. Inspect Fuel Injector

• Using a fuel injector cleaning solution, clean the injector for cylinder 1, or replace it if clogged.
• Ensure proper seating and connection of the fuel injector when reinstalling.

5. Perform Compression Test

• If misfire persists, perform a compression test on cylinder 1.
• If compression is low, further investigation into internal engine components may be necessary.