how to fix the P0301 misfire code on my Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat 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, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1 by unscrewing it and disconnecting the electrical connector.
• Carefully remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear or damage. Replace if necessary.
  • Torque specification: Tighten the new spark plug to 13 lb-ft (18 Nm).
• Reinstall the ignition coil.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil with a multimeter for proper resistance.
• If defective, replace the ignition coil with a new one, ensuring proper connection and seating.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector for cylinder 1 by disconnecting the fuel line and electrical connector.
• Inspect the fuel injector for clogs or leaks. If necessary, clean it using a specialized fuel injector cleaner or replace it with a new one.
• Reinstall the fuel injector ensuring proper seating and connections.

5. Reassemble and Test

• Reconnect the battery terminal.
• Start the engine and let it idle. Observe for any irregularities in performance.
• Clear the error codes using the OBD-II scanner.