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

Solution

1. Preparation

• Gather necessary tools and parts.
• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaner, vacuum gauge.
• Parts Required: Spark plug, ignition coil, fuel injector (if faulty), gaskets (if removed).

2. Replace Spark Plug

1. Disconnect the negative battery terminal.
2. Remove the engine cover (if applicable) to access the spark plug.
3. Use a socket wrench to remove the spark plug from cylinder 2.
4. Inspect the old spark plug; replace with a new one if worn or fouled.
5. Torque the new spark plug to the manufacturer's specifications (typically around 13-15 ft-lbs).
6. Reattach the engine cover and reconnect the battery.

3. Inspect and Replace Ignition Coil

1. Remove the ignition coil from cylinder 2 by disconnecting the electrical connector.
2. Unscrew the coil retaining bolts and lift it out.
3. Install the new ignition coil, ensuring it is seated correctly.
4. Reconnect the electrical connector and secure the coil.

4. Clean or Replace Fuel Injector

1. If the injector is suspected to be faulty, remove the fuel rail to gain access to the injector.
2. Disconnect the fuel line (use caution to avoid fuel spray).
3. Remove the injector from the rail; inspect for clogs or damage.
4. Clean the injector with appropriate cleaner or replace it with a new one.
5. Reinstall the injector and fuel rail, ensuring all connections are secure.

5. Conduct Compression Test

1. Remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine a few times to obtain a reading.
4. Compare the reading to manufacturer specifications; if low, further investigation into internal engine components may be needed.