how to fix P0302 misfire code in Toyota Corolla E210 (2019-2024)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the old spark plug using a spark plug socket.
• Inspect the gap on the new spark plug and adjust to manufacturer specifications (typically around 0.043 inches).
• Apply dielectric grease to the threads of the new spark plug and install it, torquing to manufacturer specifications (usually around 13 ft-lbs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or swapping did not resolve the misfire, replace it with a new one.
• Tools Required: Socket set.
• Remove the faulty ignition coil as previously described.
• Install the new ignition coil and secure it with the retaining bolts. Reconnect the electrical connector.

4. Check and Replace Fuel Injector (if necessary)

• If the injector test indicated a failure, replace the fuel injector for cylinder 2.
• Tools Required: Fuel injector puller, socket set, ratchet.
• Depressurize the fuel system by removing the fuel pump fuse and starting the engine until it stalls.
• Disconnect the fuel lines and electrical connectors from the injector.
• Remove the faulty fuel injector and install the new one, ensuring proper seating and securing the connectors.

5. Final Assembly

• Reconnect the battery and ensure all connections are secure.
• Clear the P0302 code using an OBD-II scanner.