how to fix P0301 code in Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery negative terminal to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts and disconnecting the electrical connector.
• Use a spark plug socket to remove the old spark plug.
• Install the new spark plug by hand to avoid cross-threading, then torque to manufacturer's specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil securely.

3. Test Ignition Coil

• If previously swapped, check the operation of the ignition coil in the original cylinder.
• If necessary, replace the ignition coil for cylinder 1 with a new one.
• Reconnect the battery terminal.

4. Inspect and Replace Fuel Injector (if needed)

• Tools Required: Fuel injector puller or pliers, O-rings for fuel injector.
• Disconnect the fuel injector electrical connector.
• Remove the fuel rail (if applicable) to access the injector.
• Replace the fuel injector with a new one, ensuring new O-rings are used to prevent leaks.
• Reattach the fuel rail and reconnect electrical connectors.

5. Address Compression Issues

• If compression is low, further diagnostics may be required. Consider checking for valve issues or piston damage.
• If repairs are needed, follow manufacturer guidelines for cylinder head removal and inspection.