how to fix a misfire in my Toyota RAV4 XA40 (2013-2018) with code P0302

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover (if applicable).
• Use the socket wrench to remove the spark plug from cylinder 2.
• Inspect the old spark plug for signs of wear or fouling; replace if necessary.
• Apply a small amount of dielectric grease to the spark plug threads.
• Install the new spark plug and tighten to the manufacturer's specification (typically around 13-16 lb-ft).

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
• Disconnect the electrical connector from the ignition coil.
• Install the new ignition coil and reconnect the electrical connector.
• Secure the ignition coil with the retaining bolts to the specified torque.

4. Inspect and Test Fuel Injector

• Tools Required: Noid light or oscilloscope.
• Disconnect the fuel injector connector for cylinder 2.
• Connect the noid light to the fuel injector connector.
• Crank the engine and check if the noid light flashes, indicating the injector is receiving a signal.
• If not flashing, inspect the wiring and connectors for damage; repair or replace as necessary. If flashing, proceed to test the injector for proper flow.

5. Reassembly

• Reinstall any components removed during the process, including the engine cover.
• Reconnect the negative battery terminal.