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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter (if testing ignition coil)

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 by unscrewing its bolts and gently pulling it out.
• Unplug the electrical connector from the ignition coil.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon deposits, or damage.
• Replace the spark plug with a new one, ensuring it is gapped correctly according to manufacturer specifications.
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if necessary)

• If the spark plug is in good condition, test the ignition coil using a multimeter to check for proper resistance.
• If out of specification, replace the ignition coil with a new one.
• Reinstall the ignition coil onto the spark plug and secure it with the bolts.

4. Inspect and Clean Fuel Injector

• If misfire persists, remove the fuel injector from cylinder 1.
• Use a fuel injector cleaner or ultrasonic cleaner to remove any clogs.
• Reinstall the fuel injector and ensure all connections are secure.

5. Perform Compression Test

• Insert the compression tester into the spark plug hole of cylinder 1.
• Crank the engine to take a reading; compare it to specifications.
• If compression is low, further diagnostic steps may be needed to identify internal engine issues.