how to fix P0302 misfire code in Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the engine cover if applicable.
• Use a socket wrench to remove the spark plug from cylinder 2.
• Inspect the old spark plug for wear; replace if necessary.
• Install the new spark plug and torque to the manufacturer’s specification (typically around 13 lb-ft).
• Reinstall the engine cover if removed.

3. Replace Ignition Coil

• Tools Required: Socket set
• Locate the ignition coil for cylinder 2.
• Disconnect the electrical connector from the ignition coil.
• Remove the mounting bolts and take out the ignition coil.
• Install the new ignition coil and reattach the electrical connector.
• Ensure it is secured properly.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner (if cleaning), safety goggles
• Disconnect the fuel injector connector for cylinder 2.
• Remove the fuel rail and take out the injector for cylinder 2.
• Inspect the injector for clogs or damage; clean it or replace as necessary.
• Reinstall the injector and secure the fuel rail back in place.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0302 code from the system.