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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 using a socket set.
• Unscrew the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear or damage. If necessary, replace it with a new one, ensuring it is gapped correctly.
• Reinstall the ignition coil and reconnect it.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil using a multimeter to check for proper resistance.
• If faulty, disconnect the wiring harness and remove the ignition coil from cylinder 1.
• Install a new ignition coil, ensuring it is securely seated and connected.

4. Test Fuel Injector

• Use a fuel injector tester to check the operation of the fuel injector for cylinder 1.
• If the injector is not functioning, remove it from the engine.
• Replace it with a new fuel injector and ensure it is properly seated.

5. Compression Test

• If the misfire persists, perform a compression test on cylinder 1.
• If compression is low, further diagnostics may be required to check for internal engine issues like valve problems or head gasket failure.