how to resolve the P0301 misfire code in my Toyota RAV4?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

• Remove the spark plug wire or ignition coil from cylinder 1.
• Use a spark plug socket to remove the old spark plug.
• Inspect the threads for damage and clean if necessary.
• Install a new spark plug (ensure correct gap as per manufacturer specifications).
• Reattach the ignition coil or spark plug wire securely.

3. Inspect and Replace Ignition Coil (if necessary)

• Disconnect the wiring harness from the ignition coil.
• Remove the bolts securing the ignition coil and lift it off.
• Install the new ignition coil in reverse order of removal and ensure it is seated properly.
• Reconnect the wiring harness.

4. Check and Clean Fuel Injector

• Remove the fuel injector from cylinder 1 (may require removal of the intake manifold).
• Inspect the injector for clogs or damage.
• Clean the injector using a fuel injector cleaner or replace it with a new one.
• Reinstall the injector, ensuring proper sealing and orientation.

5. Reassemble and Reconnect

• Reassemble any components removed during the repair.
• Reconnect the negative battery terminal.