how to deal with P0302 code on Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery for safety.
• Ensure the engine is cool before starting any work.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug gap tool
• Remove the engine cover if applicable.
• Disconnect the electrical connector from the ignition coil on cylinder 2.
• Remove the ignition coil bolt using a socket and ratchet, then pull the coil out.
• Remove the spark plug using a spark plug socket and ratchet.
• Install the new spark plug, ensuring it is gapped correctly to the manufacturer's specifications (typically 0.043 inches for Toyota).
• Reinstall the ignition coil, tightening the bolt to the specified torque (usually around 80 in-lbs).
• Reconnect the electrical connector to the ignition coil.

3. Check and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector puller, socket set
• Disconnect the fuel injector electrical connector.
• Remove the retaining clips and the fuel rail bolts.
• Remove the fuel rail to access the fuel injector.
• Pull out the old fuel injector and replace it with a new one, lubricating the O-rings with clean engine oil.
• Reinstall the fuel rail and secure it with bolts.

4. Reassemble and Reconnect Battery

• Reconnect the negative terminal of the battery.
• Replace any engine covers that were removed.
• Start the engine and allow it to reach operating temperature.