how to fix the check engine light P0302 in my Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Make sure the engine is cool before starting.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if present.
2. Locate the spark plug for cylinder 2 (consult the owner's manual for the exact location).
3. Use a socket set to remove the spark plug from cylinder 2.
4. Inspect the spark plug for wear or damage; replace it if necessary with a new spark plug that meets OEM specifications.
5. Torque the new spark plug to the manufacturer's specification (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

1. Unplug the electrical connector from the ignition coil for cylinder 2.
2. Remove the ignition coil by unbolting it (usually a couple of screws).
3. Inspect the ignition coil for cracks or signs of failure. Replace if damaged.
4. Install the new ignition coil and reconnect the electrical connector.
5. Ensure the coil is properly seated and secured.

4. Check Fuel Injector

1. Locate the fuel injector for cylinder 2 (follow the fuel rail).
2. Disconnect the fuel injector connector.
3. Use a multimeter to check for proper voltage and resistance; compare readings to specifications in the service manual.
4. If faulty, replace the injector with a new one.
5. Reconnect the fuel injector and ensure it's securely seated.

5. Reassemble and Test

1. Reattach the engine cover if it was removed.
2. Reconnect the battery.
3. Start the engine and allow it to idle for a few minutes.
4. Check for any remaining codes using the OBD-II scanner.