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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench, anti-seize compound.
• Remove the engine cover if applicable.
• Use the spark plug socket to remove the spark plug in cylinder 1.
• Inspect the spark plug for wear; replace it if necessary.
• Apply a small amount of anti-seize compound to the threads of the new spark plug.
• Install the new spark plug and tighten it to the manufacturer’s specified torque (typically around 13 lb-ft for most Toyota spark plugs).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, multimeter (optional).
• Remove the ignition coil connector for cylinder 1.
• Remove the bolts securing the ignition coil and gently pull it out.
• Inspect the coil for cracks or damage.
• If faulty, replace with a new ignition coil and reconnect the electrical connector.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaning kit or new injector.
• If cleaning, remove the fuel injector from cylinder 1 using the appropriate socket.
• Use a fuel injector cleaning kit to clean the injector according to the manufacturer's instructions.
• If replacing, install the new injector, ensuring it is seated properly.

5. Check Compression

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1 and install the compression gauge.
• Crank the engine several times to get a reading.
• Compare the compression reading to the manufacturer's specifications (typically 180-200 psi).
• If compression is low, further investigation into engine internals may be required.

6. Inspect for Vacuum Leaks

• Visually check vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a vacuum gauge to check for correct readings.
• Repair or replace any damaged hoses.