how to fix P0301 misfire code in Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, gap gauge.
• Remove the ignition coil covering to access the spark plug.
• Remove the spark plug using the socket wrench.
• Inspect the spark plug for wear, carbon buildup, or damage; replace if necessary.
• Gap the new spark plug to specifications (typically 0.043 inches for Toyota).
• Install the new spark plug by hand initially, then tighten to the manufacturer's torque specification (usually around 13 lb-ft).

3. Check and Replace Ignition Coil

• Tools Required: Socket set, ratchet, torque wrench.
• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the ignition coil using the socket set.
• Inspect the ignition coil for cracks or signs of wear; replace if necessary.
• Install the new ignition coil by reversing the removal steps and tightening to the specified torque.

4. Test Fuel Injector

• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector from cylinder 1.
• Connect the noid light or multimeter to the injector connector to check for voltage while cranking the engine.
• If no voltage is present, check the wiring harness for damage; repair as necessary.
• If the injector is faulty, replace it by removing the fuel rail and installing a new injector.

5. Reassemble and Reconnect

• Reconnect any removed components, ensuring all connections are secure.
• Reconnect the negative battery terminal.