how to fix P0302 misfire code in Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety while working on the electrical components.

2. Inspect and Replace Spark Plug

1. Locate the spark plug for cylinder 2 (refer to the vehicle’s service manual for exact location).
2. Remove the ignition coil by disconnecting the electrical connector and unbolting it (typically requires a socket set).
3. Remove the spark plug using a spark plug socket and ratchet.
4. Inspect the old spark plug for signs of fouling, wear, or damage.
5. Install a new spark plug (ensure it is properly gapped according to manufacturer specifications).
6. Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

1. If the spark plug is in good condition, test the ignition coil for proper operation using a multimeter.
2. If the ignition coil is faulty, remove it and install a new ignition coil suitable for the vehicle model.
3. Reconnect any connectors and ensure everything is secured properly.

4. Check Fuel Injector

1. If the misfire persists, remove the fuel injector for cylinder 2.
2. Clean or replace the fuel injector if it is clogged or malfunctioning.
3. Reinstall the fuel injector, ensuring it is seated properly.

5. Verify Repair

1. Reconnect the negative battery terminal.
2. Start the engine and allow it to reach operating temperature.
3. Use the OBD-II scanner to check for any remaining codes and confirm that the P0302 code has cleared.