how to fix P0302 misfire code in Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Spark Plug

• Remove the Engine Cover: Use a socket set to take off the engine cover bolts.
• Accessing Spark Plug: Locate the spark plug in cylinder 2 (refer to the service manual for exact positioning).
• Remove Spark Plug: Use a spark plug socket and ratchet to unscrew the spark plug. Inspect for wear, carbon buildup, or damage.
• Install New Spark Plug: Apply anti-seize compound on the threads, and torque to manufacturer specifications (typically around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Remove Ignition Coil: Unscrew the bolts holding the ignition coil in place using a socket set, disconnect the electrical connector.
• Install New Ignition Coil: Position the new coil, reconnect the electrical connector, and secure it with bolts. Torque to manufacturer specifications.

4. Check Fuel Injector

• Remove Fuel Injector Connector: Unplug the connector from the fuel injector in cylinder 2.
• Test Fuel Injector: Use a multimeter to check for proper resistance (usually 12-16 ohms). If faulty, replace it.
• Install New Fuel Injector: If necessary, apply a small amount of engine oil to the O-ring and insert the new injector, ensuring it’s seated properly.

5. Final Steps

• Reconnect Battery: Reattach the negative battery terminal.
• Clear Codes: Use the OBD-II scanner to clear any stored codes.
• Test Drive: Start the engine and check for any further misfire codes.