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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety during the repair.
• Allow the engine to cool completely before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts and gently pulling it out.
• Remove the spark plug using the spark plug socket. Inspect the old spark plug for signs of wear (e.g., carbon buildup, wear on the electrodes).
• Install the new spark plug, ensuring it meets manufacturer specifications. Use a torque wrench to tighten it to the specified torque (typically around 13-15 lb-ft).
• Apply dielectric grease to the terminal of the new spark plug.

3. Replace Ignition Coil

• Tools Required: Socket set.
• Install the new ignition coil onto the spark plug, ensuring it is seated properly.
• Reattach and tighten the mounting bolts for the ignition coil.
• Reconnect the electrical connector to the ignition coil.

4. Check Fuel Injector

• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector for cylinder 1.
• Connect the noid light or multimeter to the injector connector to test for voltage and pulse signal while cranking the engine.
• If the fuel injector is faulty, replace it with a new one. Ensure proper seating and connection.

5. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and observe for smooth operation and check if the check engine light remains off.