how to fix the P0302 code on my Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 2 by unscrewing the bolts and disconnecting the electrical connector.
• Remove the spark plug using the spark plug socket and ratchet.
• Inspect the spark plug for wear or damage; replace if necessary.
• Install the new spark plug, tightening it to the manufacturer's specified torque (usually around 13-15 ft-lbs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if needed)

• Tools Required: Multimeter, socket set.
• With the ignition coil removed, test its resistance using a multimeter; compare the readings to the manufacturer's specifications.
• If the coil is out of specification, replace it with a new one.
• Reinstall the coil and ensure all connections are secure.

4. Inspect and Replace Fuel Injector (if needed)

• Tools Required: Fuel injector puller, socket set.
• Disconnect the fuel line at the injector rail and relieve fuel pressure.
• Remove the fuel injector retaining clips and pull the injector from the rail.
• Inspect the injector for clogs or leaks; replace if malfunctioning.
• Install the new injector, ensuring proper seating and secure the retaining clips.

5. Final Checks

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle, checking for smooth operation.
• Monitor for any reoccurring check engine light.