my Toyota Highlander Third Generation (2014-2019) has a check engine light with code P0302, what to...

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before beginning work.

2. Replace Spark Plug for Cylinder 2

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 2 by unbolting it and disconnecting the wiring harness.
• Remove the old spark plug using a spark plug socket and inspect for wear or fouling.
• Gap the new spark plug to manufacturer specifications and apply dielectric grease to the coil boot.
• Install the new spark plug by hand to avoid cross-threading, then torque to the manufacturer’s specification (usually around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the wiring harness.

3. Inspect and Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• If the ignition coil appears damaged, remove it and replace it with a new coil.
• Torque the ignition coil mounting bolts to manufacturer specifications (usually around 85-100 in-lbs).

4. Test Fuel Injector (if necessary)

• Tools Required: Fuel injector tester or multimeter.
• If the fuel injector is found faulty during diagnostics, remove and replace it.
• Ensure proper installation and reconnect the fuel lines, ensuring no leaks.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0302 code from the vehicle's computer.