how to diagnose a P0302 code in my Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

1. Remove the ignition coil from cylinder 2 by unbolting and disconnecting the electrical connector.
2. Use a spark plug socket to remove the spark plug from cylinder 2.
3. Inspect the old spark plug for wear; replace it if it appears damaged or worn.
4. Apply anti-seize lubricant on the new spark plug threads and install it into cylinder 2, tightening to manufacturer specifications (typically around 13-15 lb-ft).
5. Reinstall the ignition coil over the new spark plug.

3. Inspect and Replace Ignition Coil (if necessary)

1. If the ignition coil was found to be faulty during testing, remove it from cylinder 2.
2. Install a new ignition coil, ensuring it fits securely.
3. Reconnect the electrical connector and secure with the bolt.

4. Check and Replace Fuel Injector (if necessary)

1. Disconnect the fuel supply line and electrical connector from the fuel injector of cylinder 2.
2. Remove the old fuel injector using an appropriate tool.
3. Install the new fuel injector, ensuring it is seated properly.
4. Reconnect the fuel supply line and electrical connector.

5. Verify Engine Timing (if applicable)

1. Remove timing cover if necessary to access timing components.
2. Align timing marks according to service manual specifications.
3. Adjust timing as needed to ensure proper alignment.