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

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil for cylinder 1 by unbolting it and disconnecting the electrical connector.
• Use the spark plug socket to remove the spark plug.
• Inspect the old spark plug for wear, and replace it with a new one. Torque the new spark plug to the manufacturer's specification (usually around 13-15 lb-ft).

3. Inspect/Replace Ignition Coil

• If the spark plug was fine, inspect the ignition coil for cylinder 1.
• Tools Required: Socket set.
• Remove the ignition coil as described previously.
• Test the ignition coil with a multimeter (check resistance as per manufacturer specs).
• If faulty, replace the ignition coil with a new one.

4. Test Fuel Injector

• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light to check for voltage; if there is no light, the injector may be faulty, or the wiring may be damaged.
• If the injector is faulty, replace it with a new one.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 and install the compression tester.
• Crank the engine and record the compression reading.
• Compare the reading to the manufacturer's specifications (usually around 150-200 psi).
• If low compression is detected, further investigation is needed for possible head gasket or valve issues.