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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage.
• Replace with a new spark plug (ensure gap is set to manufacturer's specification).

3. Test and Replace Ignition Coil (if necessary)

• Using a multimeter, check the resistance of the ignition coil; compare with specifications in the service manual.
• If the ignition coil is faulty, remove it and install a new one.
• Reconnect the ignition coil to the spark plug.

4. Fuel Injector Inspection

• Disconnect the fuel injector connector for cylinder 2.
• Use a noid light to test for proper signal to the injector; if there is no signal, check wiring and the engine control module.
• If the injector is faulty, remove it using a fuel injector puller.
• Install a new fuel injector, ensuring proper seating and connection.

5. Final Checks

• Reconnect the battery terminal.
• Start the engine and monitor for any misfire codes or irregularities.