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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil from cylinder 2 by unbolting it and disconnecting the electrical connector.
  2. Remove the spark plug using a spark plug socket and ratchet.
  3. Inspect the spark plug for wear, cracks, or carbon buildup. Replace if damaged.
  4. Install a new spark plug, tightening it to a torque of 13 lb-ft (18 Nm).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is fine, inspect the ignition coil for cracks or damage.
  2. Replace the ignition coil if necessary by removing it from the cylinder head.
  3. Connect the new ignition coil and ensure it’s seated properly.

4. Check Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Use a noid light to check for proper signal to the injector. Replace if there is no signal.

5. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine to get a reading. A healthy cylinder should have a compression of 180 psi or higher. If low, further investigation into engine internals is needed.