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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, gapping tool.
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the wiring harness.
• Remove the spark plug using a spark plug socket and inspect it for wear or fouling. Replace if necessary.
• Gap the new spark plug to manufacturer specifications and install it into cylinder 2.
• Torque the spark plug to the manufacturer’s recommended value (typically around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the wiring harness.

3. Inspect and Replace Ignition Coil

• If the ignition coil appears damaged or if the spark plug replacement does not resolve the issue:
• Remove the ignition coil from cylinder 2.
• Install a new ignition coil, ensuring it is seated properly.
• Reconnect the wiring harness.

4. Check Fuel Injector

• If the misfire persists, test the fuel injector for cylinder 2:
• Remove the injector connector and use a multimeter to check the resistance (should be within manufacturer specifications).
• If faulty, remove the fuel rail and replace the injector.
• Reinstall the fuel rail, ensuring all seals and O-rings are properly seated.