what should I do if my Toyota Highlander Fourth Generation (2020-present) has a check engine light a...

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Remove the ignition coil for cylinder 2:
  • Unplug the electrical connector.
  • Remove the mounting bolts using a socket set.
  • Carefully pull the ignition coil out of the spark plug well.
• Remove the spark plug:
  • Use a spark plug socket to unscrew the spark plug from cylinder 2.
  • Inspect the spark plug for wear, carbon buildup, or damage.
• Replace the spark plug if necessary:
  • Install a new spark plug, ensuring it meets specifications (typically a gap of 0.043 inches).
  • Torque the spark plug to the manufacturer’s specification (usually around 13 ft-lbs).

3. Inspect and Replace Ignition Coil (if needed)

• Check the ignition coil for any visible damage or corrosion.
• If the ignition coil is faulty, replace it with a new part:
  • Install the new ignition coil onto the spark plug.
  • Reattach the mounting bolts and electrical connector.

4. Inspect Fuel Injector

• Remove the fuel injector for cylinder 2:
  • Disconnect the fuel line and electrical connector.
  • Unbolt the injector from the manifold.
• Check for clogs or damage:
  • Clean the injector with an appropriate cleaner or replace it if necessary.

5. Reassemble and Reconnect Battery

• Reassemble all components in reverse order.
• Reconnect the negative battery terminal.