how do I fix P0302 code on my Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket.
• Sub-steps:
  1. Remove the engine cover (if applicable) by unscrewing any fasteners.
  2. Locate the ignition coil on cylinder 2 (refer to the owner's manual for location).
  3. Disconnect the electrical connector from the ignition coil.
  4. Remove the ignition coil by unscrewing the bolts holding it in place.
  5. Inspect the spark plug for wear or damage; replace if necessary:
     • Use a spark plug socket to remove the old spark plug.
     • Apply anti-seize compound to the threads of the new spark plug.
     • Torque the new spark plug to manufacturer specifications (typically around 13 lb-ft).
  6. Install the new ignition coil and reconnect the electrical connector.

3. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector removal tool, torque wrench.
• Sub-steps:
  1. Disconnect the fuel pump relay and run the engine until it stalls to relieve fuel pressure.
  2. Disconnect the electrical connector and fuel line from the fuel injector.
  3. Remove the fuel injector retaining clips and pull out the injector from the rail.
  4. Install the new injector with new O-rings, ensuring proper seating.
  5. Reconnect the fuel line and electrical connector securely.

4. Reassemble and Test

• Reinstall any components that were removed during the inspection.
• Reconnect the negative battery terminal.
• Start the engine and allow it to idle, checking for any irregularities.