how to fix P0302 misfire code on my Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather tools and materials.
• Disconnect the negative battery terminal.
• Allow the engine to cool down before proceeding with repairs.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
  • Remove the ignition coil cover if applicable.
  • Disconnect the electrical connector from the ignition coil in cylinder 2.
  • Remove the ignition coil by unscrewing it from the cylinder head.
  • Use a spark plug socket to remove the spark plug from cylinder 2.
  • Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
  • Install a new spark plug, ensuring it is gapped correctly according to specifications (typically 0.043 inches).
  • Tighten the spark plug to manufacturer’s torque specifications (usually around 13 lb-ft).

3. Replace Ignition Coil

• Tools Required: Socket set
  • If the spark plug is in good condition, inspect the ignition coil for cracks or damage.
  • If needed, replace the ignition coil with a new one. Install it by aligning it with the spark plug and pushing it down until it clicks into place.
  • Reconnect the electrical connector to the ignition coil.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if applicable)
  • If the injector is suspected to be faulty, remove it after releasing the fuel pressure.
  • Inspect for clogs and clean or replace the fuel injector as necessary.
  • Reinstall the fuel injector ensuring a proper seal.

5. Verify Engine Health

• If compression is low, further diagnostics are needed to determine if there are internal engine issues such as valve or piston damage.