how to fix P0301 engine misfire code on Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, spark plug gap tool, compression tester, noid light, multimeter.
• Park the vehicle on a flat surface and secure it with wheel chocks.
• Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug in Cylinder 1

1. Locate the spark plug for cylinder 1 (usually in the front of the engine).
2. Remove the ignition coil by unscrewing it and gently pulling it out.
3. Use a spark plug socket to remove the old spark plug.
4. Inspect the new spark plug, ensuring the gap is set according to manufacturer specifications (typically 0.043 inches).
5. Install the new spark plug by hand, then torque it to the manufacturer’s specification (usually around 13-16 ft-lbs).
6. Reinstall the ignition coil and fasten it securely.

3. Replace Ignition Coil for Cylinder 1

1. If the ignition coil inspection showed damage, remove it as described above.
2. Install the new ignition coil onto the spark plug, ensuring it is seated correctly.
3. Reconnect the electrical connector to the ignition coil.

4. Inspect and Replace Fuel Injector (if necessary)

1. If the fuel injector was determined to be faulty, remove the fuel rail according to the service manual.
2. Disconnect the fuel lines and electrical connectors carefully.
3. Remove the faulty fuel injector and replace it with a new one, ensuring proper sealing.
4. Reassemble the fuel rail, reconnecting all components securely.

5. Final Checks

1. Reconnect the negative battery terminal.
2. Start the engine and let it idle for a few minutes to ensure smooth operation.
3. Conduct a test drive to confirm that the issues are resolved.