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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unscrewing the bolts and disconnecting the electrical connector.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of wear, carbon buildup, or damage. Replace it if necessary.
• Install the new spark plug, torquing it to the manufacturer's specification (typically around 13-15 lb-ft).
• Reinstall the ignition coil.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter.
• Test the ignition coil by measuring the resistance; refer to service manual specifications.
• If the resistance is out of specification, remove the faulty ignition coil and replace it with a new one.
• Reconnect the electrical connector and secure it back in place.

4. Inspect Fuel Injector

• Tools Required: Fuel pressure gauge, fuel line disconnect tool.
• Check fuel pressure at the fuel rail to ensure proper delivery.
• If the fuel injector is clogged or malfunctioning, remove it and clean or replace as necessary.

5. Check for Vacuum Leaks

• Inspect hoses and the intake manifold gasket for any cracks or disconnections.
• Use a smoke machine or carburetor cleaner to detect any vacuum leaks and repair as necessary.