how to resolve the P0302 error code on my Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Locate the spark plug for cylinder 2 (refer to vehicle service manual for exact location).
  3. Remove the ignition coil by unbolting and disconnecting the electrical connector.
  4. Unscrew the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for wear or damage; replace it with a new one if necessary (specify gap according to manufacturer specs).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is fine, check the ignition coil for faults.
  2. Remove the ignition coil and check for cracks or damage.
  3. Replace the ignition coil if found defective with a new one (ensure it matches OEM specifications).

4. Test and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Use a noid light to check for power to the fuel injector while cranking the engine.
  3. If no power is present, check the wiring harness and connectors leading to the injector.
  4. If power is present but injector is faulty, remove the injector using a fuel injector removal tool and replace it with a new one.

5. Address Any Compression Issues

• Sub-steps:
  1. If misfire persists, perform a compression test on cylinder 2.
  2. If compression is low, further investigation may be needed for internal engine issues (e.g., valve problems, piston rings).
  3. Repairs may include cylinder head gasket replacement or more extensive engine repairs as needed.