how to diagnose the P0302 misfire code in my Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool down before beginning work.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Use a socket wrench to remove the bolts securing the coil.
  • Disconnect the electrical connector.
• Remove the spark plug from cylinder 2:
  • Use a spark plug socket and ratchet to unscrew the spark plug.
• Inspect the spark plug for wear or damage; replace if necessary:
  • Use a new spark plug that meets OEM specifications (e.g., NGK or Denso).
  • Torque the new spark plug to manufacturer specifications (typically around 13-15 ft-lbs).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil:
  • Use a multimeter to check the resistance of the coil.
• If the coil is faulty, replace it with a new one:
  • Install the new ignition coil and reconnect the electrical connector.
  • Secure it with the bolts removed earlier.

4. Inspect and Clean Fuel Injector

• If the ignition components are functioning, check the fuel injector for cylinder 2:
  • Remove the fuel injector connector and unscrew the injector from the rail.
• Clean the injector using an injector cleaner spray or replace it if necessary:
  • Ensure to use a new O-ring and torque the injector to the manufacturer’s specifications.

5. Reassemble and Reconnect

• Reinstall any components that were removed to access the spark plug and ignition coil.
• Reconnect the negative battery terminal.