how to fix P0301 misfire code on my Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear or damage; replace it if necessary.
• Apply a small amount of dielectric grease to the spark plug threads and reinstall it, tightening to the manufacturer’s specified torque (typically around 13 ft-lbs).
• Reattach the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 1 if it was not already done.
• Test the ignition coil using a multimeter (check for primary and secondary resistance according to manufacturer specifications).
• If defective, replace the ignition coil with a new one.
• Reinstall the ignition coil and ensure all connections are secure.

4. Check and Replace Fuel Injector

• Tools Required: Fuel injector removal tool, socket set.
• Disconnect the fuel line and electrical connector from the fuel injector on cylinder 1.
• Remove the fuel injector using the appropriate tool.
• Test the injector for proper operation (you may need a fuel injector tester).
• If faulty, replace the fuel injector with a new one.
• Reinstall the injector and reconnect the fuel line and electrical connector.

5. Compression Test (if necessary)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 and connect the compression tester to the spark plug hole.
• Crank the engine for several revolutions to obtain a reading.
• Compare the compression reading to manufacturer specifications. If low, further engine diagnostics may be needed.