how to fix P0301 code in my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface, with the engine off and cooled down.
• Disconnect the negative battery terminal to prevent electrical shocks.

2. Inspect and Replace Spark Plug

• Remove the spark plug cover if applicable.
• 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.
• If damaged, replace with a new spark plug that meets OEM specifications (typically NGK or Denso).
• Torque the new spark plug to the manufacturer's specifications (usually around 13 lb-ft for most Toyota models).

3. Check and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil in cylinder 1.
• Remove the ignition coil using a socket to unscrew it from the cylinder head.
• Visually inspect the coil for cracks or other damage.
• If faulty, install a new ignition coil (ensure it’s compatible with your vehicle).
• Reconnect the electrical connector and ensure it clicks into place.

4. Inspect and Replace Fuel Injector

• Locate the fuel injector for cylinder 1.
• Disconnect the fuel injector connector.
• Remove any retaining clips and carefully pull out the fuel injector.
• Inspect the injector for clogs or leaks. Clean or replace it if necessary.
• Reinstall the injector, ensuring it is seated properly, and reconnect the electrical connector.

5. Compression Test

• Remove the spark plug from cylinder 1.
• Insert a compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications; if low, further investigation into engine internals may be needed.

6. Check for Vacuum Leaks

• Inspect the intake manifold and vacuum hoses visually for cracks or disconnections.
• Use a smoke machine or carb cleaner to identify leaks while the engine is running.
• Repair or replace any defective hoses or gaskets found during the inspection.