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

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. Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  1. Unplug the electrical connector from the ignition coil.
  2. Remove the retaining bolts using a socket set.
  3. Carefully lift out the ignition coil.
• Remove the spark plug:
  1. Use a spark plug socket to unscrew and remove the spark plug.
  2. Inspect the old spark plug for wear or damage (replace if necessary).
• Install the new spark plug:
  1. Torque the spark plug to the manufacturer's specification (typically around 13-15 lb-ft).
  2. Reinstall the ignition coil and secure it with bolts.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil shows signs of damage:
  1. Remove the faulty coil as previously described.
  2. Install the new ignition coil in the same position.
  3. Reconnect the electrical connector securely.

4. Test Fuel Injector

• If the injector is suspected:
  1. Remove the fuel injector connector.
  2. Use a noid light to check for proper signal; replace the injector if no signal is detected.
  3. If replacing, remove the fuel rail to access the injector, ensuring to relieve fuel pressure first.

5. Compression Test

• If misfire persists:
  1. Perform a compression test on cylinder 2.
  2. If compression is low, further diagnostics may be required to check for internal engine issues (e.g., valve problems).