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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety while working on the electrical systems.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil cover by loosening any screws or clips.
• Disconnect the ignition coil wiring harness for cylinder 2.
• Remove the ignition coil from cylinder 2 by unscrewing it.
• Remove the spark plug from cylinder 2 using the spark plug socket.
• Inspect the spark plug for wear or fouling. Replace it if damaged.
• Install the new spark plug and torque it to the manufacturer’s specification (usually around 13-15 lb-ft).
• Reinstall the ignition coil and connect the wiring harness.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or if the spark plug was not the issue, replace the ignition coil.
• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 2 as previously described.
• Install the new ignition coil and secure it with bolts, torquing to manufacturer specifications.
• Reconnect the ignition coil wiring harness.

4. Inspect and Clean Fuel Injector

• If the misfire persists, inspect the fuel injector for cylinder 2.
• Tools Required: Fuel injector removal tool (if necessary)
• Disconnect the fuel injector connector and remove the fuel rail (if applicable).
• Remove the fuel injector from cylinder 2.
• Clean the injector using a suitable cleaner or replace it if clogged or defective.
• Reinstall the fuel injector and reconnect the fuel rail and electrical connector.

5. Perform Final Checks

• Reconnect the negative battery terminal.
• Start the engine and observe for any misfire symptoms.
• Clear the P0302 code using the OBD-II scanner.