how to fix P0302 cylinder 2 misfire in Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool, and disconnect the negative battery terminal.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 2.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the old spark plug for wear or damage; replace if necessary.
• Install the new spark plug, torquing to 13 lb-ft (17.6 Nm).

3. Replace Ignition Coil

• Remove the ignition coil from cylinder 2.
• Install the new ignition coil, ensuring it is seated properly.
• Reconnect the electrical connector to the ignition coil.

4. Check and Replace Fuel Injector (if necessary)

• If the injector is faulty, remove the fuel rail retaining bolts and gently pull the fuel rail away.
• Disconnect the electrical connector from the injector and remove it from the rail.
• Install the new injector and ensure proper seating.
• Reattach the fuel rail and secure with retaining bolts.

5. Reconnect Battery and Clear Codes

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

Tools Required:

• OBD-II scanner
• Spark plug socket
• Ratchet and extensions
• Torque wrench
• Multimeter
• Stethoscope (optional)

Parts Required:

• Spark plug for cylinder 2
• Ignition coil for cylinder 2
• Fuel injector for cylinder 2 (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool before performing any repairs.