how to resolve the check engine code P0302 in my Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface with the engine off and cooled down.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Ignition Coil

1. Remove the engine cover if necessary to access the ignition coil.
2. Disconnect the electrical connector from the ignition coil on cylinder 2.
3. Remove the ignition coil using a socket set (typically a 10mm socket).
4. Install the new ignition coil, ensuring it is seated properly.
5. Reconnect the electrical connector.

3. Replace Spark Plug

1. Remove the ignition coil from cylinder 2 to access the spark plug.
2. Use a spark plug socket to remove the old spark plug.
3. Inspect the spark plug for signs of damage and ensure the gap is set to manufacturer specifications (typically around 0.043 inches).
4. Install the new spark plug, tightening it to the specified torque (usually around 13 lb-ft).
5. Reinstall the ignition coil.

4. Check Fuel Injector Operation

1. Disconnect the fuel injector connector for cylinder 2.
2. Use a multimeter to check the resistance of the fuel injector; refer to specifications (typically around 12-16 ohms).
3. If the injector is faulty, remove it and replace it with a new one, ensuring the O-rings are properly lubricated before installation.
4. Reconnect the fuel injector and the electrical connector.