how to fix P0302 code on my Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before beginning work.

2. Replace Spark Plug

1. Remove the engine cover (if applicable) using a socket set.
2. Use a socket wrench to remove the spark plug from cylinder 2.
3. Inspect the old spark plug for wear; replace with a new one if necessary.
4. Torque the new spark plug to the manufacturer's specification (typically around 13-15 lb-ft).
5. Reattach the spark plug wire or ignition coil.

3. Inspect and Replace Ignition Coil

1. Disconnect the ignition coil connector from cylinder 2.
2. Remove the ignition coil using a socket set.
3. If a swap test was performed, replace the faulty coil with a new one for cylinder 2.
4. Reconnect the ignition coil connector and ensure a secure fit.

4. Test and Replace Fuel Injector (if needed)

1. Disconnect the fuel injector connector from cylinder 2.
2. Use a multimeter to check for proper voltage at the injector connector.
3. If there is no voltage, check the wiring; if the voltage is present but the injector is not functioning, replace the injector.
4. Install the new fuel injector and reconnect the connector.

5. Recheck Compression (if necessary)

1. Remove the spark plug from cylinder 2.
2. Insert a compression tester into the spark plug hole.
3. Crank the engine and record the compression reading; it should be within the manufacturer's specifications.
4. If compression is low, further investigation is needed for internal engine issues.