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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and carefully pulling it out.
• Remove the spark plug using a spark plug socket. Inspect the plug for wear or fouling.
• If the spark plug is worn, replace it with a new one, ensuring it is gapped correctly (typically around 0.043 inches).
• Reinstall the ignition coil and secure it with bolts.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter
• Using a multimeter, test the ignition coil's primary and secondary windings for proper resistance according to manufacturer specifications.
• If the coil is faulty, replace it with a new one.
• Reinstall the ignition coil and secure it.

4. Perform Fuel Injector Cleaning or Replacement

• Tools Required: Fuel injector cleaner kit or new fuel injector
• If the injector is clogged, clean it using a fuel injector cleaning kit or replace it if necessary.
• Reconnect the fuel injector to the wiring harness and ensure it is seated properly.

5. Check for Vacuum Leaks

• Inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
• Replace any damaged hoses and ensure all connections are tight.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 code from the ECU.
• Start the engine and monitor for any reoccurrence of the code.