how to fix P0302 misfire code in my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, compression tester, ratchet, torque wrench, and safety glasses.
• Safety Warnings: Disconnect the battery before working on electrical systems. Allow the engine to cool before working on components.

2. Replace Spark Plug (if necessary)

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil harness and remove the ignition coil from cylinder 2.
  3. Unscrew the spark plug using a spark plug socket.
  4. Inspect the spark plug for signs of fouling or damage; replace if necessary.
  5. Install the new spark plug and torque it to manufacturer's specifications (typically 13-15 ft-lbs).
  6. Reinstall the ignition coil and reconnect the harness.

3. Check and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil is faulty, remove it from cylinder 2.
  2. Install a new ignition coil, ensuring it's seated correctly.
  3. Reconnect the wiring harness and secure any clips.

4. Inspect and Clean or Replace Fuel Injector (if necessary)

• Sub-steps:
  1. Disconnect the fuel line and electrical connector from the fuel injector for cylinder 2.
  2. Remove the fuel injector from its rail.
  3. Clean the injector with a suitable cleaner or replace it if it is clogged or malfunctioning.
  4. Reinstall the injector, ensuring proper seating and reconnect the fuel line and electrical connector.

5. Perform Compression Test (if necessary)

• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Compare with manufacturer's specifications; if low, further diagnosis is needed for internal engine issues.