how to deal with P0302 code on my Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaner, vacuum gauge.
• Ensure the engine is cool before starting work. Disconnect the battery to avoid electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if necessary to access the spark plug.
  2. Use a socket set to carefully remove the spark plug from cylinder 2.
  3. Inspect the spark plug for signs of wear, cracks, or carbon buildup.
  4. If damaged, replace with a new spark plug that meets OEM specifications (typically NGK or Denso).
  5. Torque the new spark plug to the manufacturer's specified value (usually around 13 lb-ft).

3. Check and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the electrical connector from the ignition coil in cylinder 2.
  2. Remove the ignition coil using the appropriate socket.
  3. Test the ignition coil with a multimeter to ensure it is functioning correctly (primary and secondary resistance).
  4. If faulty, install a new ignition coil with the correct part specifications.
  5. Reconnect the electrical connector firmly.

4. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for several seconds to get a reading.
  4. Compare the reading to manufacturer specifications (usually 180-200 psi).
  5. If the reading is low, further investigate possible causes (e.g., valve issues, head gasket).

5. Inspect Fuel Injector

• Sub-steps:
  1. Disconnect the electrical connector from the fuel injector in cylinder 2.
  2. Remove the fuel rail if necessary to access the injector.
  3. Check for clogs; if dirty, clean with a fuel injector cleaner or replace with an OEM part.
  4. Reassemble the fuel rail and reconnect the fuel injector.