how to fix P0302 misfire in Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, ratchet, gap gauge.
• Remove the ignition coil from cylinder 2:
  1. Unplug the electrical connector from the ignition coil.
  2. Remove the bolt securing the ignition coil using a socket.
  3. Gently pull the ignition coil out of the spark plug well.
• Remove the old spark plug:
  1. Use a spark plug socket to unscrew the old spark plug.
  2. Inspect the spark plug for wear; clean the spark plug hole to remove debris.
• Install the new spark plug:
  1. Apply anti-seize compound to the threads of the new spark plug.
  2. Insert the new spark plug into the cylinder and tighten to the manufacturer's specified torque (typically around 13-15 lb-ft).

3. Replace Ignition Coil

• Tools Required: Socket set.
• Remove the old ignition coil:
  1. If not already removed, take off the ignition coil as detailed in step 2.
  2. Disconnect the wiring harness from the ignition coil.
• Install the new ignition coil:
  1. Connect the wiring harness to the new ignition coil.
  2. Secure the ignition coil to the cylinder head with the bolt and torque to specification.

4. Check Fuel Injector

• Tools Required: Multimeter or noid light.
• Inspect the fuel injector:
  1. Connect a multimeter to the injector terminals to check for resistance (specification typically around 12-16 ohms).
  2. If the injector is faulty, replace it with a new one.
• Reinstall any components removed for access.

5. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle for a few minutes.
• Check for any error codes using the OBD-II scanner.