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

Solution

1. Preparation

• Tools Required: OBD-II scanner, spark plug socket, torque wrench, compression tester, multimeter, fuel injector cleaning kit
• Ensure the vehicle is parked on a flat surface, and the engine is cool. Disconnect the battery.

2. Replace Spark Plug

• Remove the ignition coil from Cylinder 1 by unscrewing the mounting bolts.
• Disconnect the electrical connector from the ignition coil.
• Remove the old spark plug using a spark plug socket.
• Inspect the new spark plug, ensuring it matches specifications (check gap).
• Install the new spark plug, torquing it to manufacturer specifications (typically around 13-15 ft-lbs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil with a multimeter to verify resistance.
• If faulty, remove the ignition coil and replace it with a new one, ensuring it is seated properly.
• Reconnect the electrical connector and secure the coil.

4. Clean or Replace Fuel Injector

• Remove the fuel injector from Cylinder 1 using appropriate tools.
• If cleaning, use a fuel injector cleaning kit to services the injector.
• If replacement is needed, install the new fuel injector ensuring correct orientation and sealing.
• Reattach any connectors and fuel lines securely.

5. Compression Test

• If misfire persists, perform a compression test on Cylinder 1.
• If compression is low, further disassembly of the engine may be required to address potential internal issues (valves, piston rings).