how to fix P0301 misfire code in my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts for repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

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 and gently pulling it out.
• Use the spark plug socket to remove the spark plug from cylinder 1. Inspect for wear, carbon buildup, or damage.
• If the spark plug is worn, replace it with a new spark plug that meets manufacturer specifications (typically Denso or NGK).
• Torque the new spark plug to the manufacturer's specified value (usually around 13-16 lb-ft).
• Reinstall the ignition coil, ensuring it is seated properly.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or faulty, remove it as described above.
• Replace with a new ignition coil compatible with the RAV4 XA50.
• Reconnect the ignition coil’s electrical connector.

4. Check and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector removal tool, fuel line disconnect tool.
• Disconnect the fuel line from the injector and the electrical connector.
• Remove the retaining clips and pull out the fuel injector.
• Inspect the injector for clogs or damage. If damaged, replace it with a new injector.
• Reinstall the new injector and reconnect the fuel lines and electrical connectors.

5. Perform Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug again from cylinder 1.
• Insert the compression gauge into the spark plug hole and crank the engine.
• Compare the reading with the manufacturer’s specifications. If low, further inspection of the piston rings or valves may be required.