why does my Toyota RAV4 XA40 (2013-2018) have a check engine light P0301

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and the engine is cool.
• Disconnect the battery to ensure safety.

2. Replace Spark Plug

• Remove the spark plug wire or ignition coil from cylinder 1.
• Use a spark plug socket to remove the old spark plug.
• Inspect the spark plug gap and conditions; replace if damaged or out of spec.
• Install the new spark plug, tightening it to the manufacturer’s specified torque (typically around 13-15 lb-ft).

3. Replace Ignition Coil

• If the ignition coil is suspected to be faulty, remove it from cylinder 1.
• Disconnect the electrical connector from the ignition coil.
• Remove the mounting bolts and take out the old ignition coil.
• Install the new ignition coil and securely tighten the bolts. Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector from cylinder 1 (this may require removing the fuel rail).
• Inspect the injector for clogs; clean if necessary using a fuel injector cleaner.
• Reinstall the fuel injector ensuring proper seating and connection.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to detect leaks around the intake manifold.
• Repair or replace any damaged hoses.