how to fix P0302 misfire code on my Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease
• Remove the ignition coil from cylinder 2 by unscrewing the mounting bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug and replace it with a new one, applying dielectric grease to the boot.
• Torque the spark plug to the manufacturer's specifications (typically 13-15 lb-ft for Toyota).

3. Replace Ignition Coil

• Tools Required: Socket set
• Inspect the ignition coil for cylinder 2; if damaged, replace it with a new unit.
• Install the new ignition coil by securing it with the mounting bolts and reconnecting the electrical connector.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaner, service manual (for replacement procedures)
• If the fuel injector is clogged, use a fuel injector cleaning solution following the manufacturer’s instructions. If still faulty, remove and replace the injector.
• Reinstall the fuel injector and ensure the O-rings are seated properly to prevent leaks.

5. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle for a few minutes to ensure there are no leaks or issues.