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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Use a socket wrench to remove the spark plug from cylinder 1.
• Inspect the old spark plug for wear or fouling; replace if necessary.
• Install a new spark plug (use OEM specifications for gap).
• Torque the spark plug to the manufacturer's specifications (usually around 13-20 lb-ft).

3. Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the ignition coil retaining bolts using a socket set.
• Carefully pull the ignition coil out of the spark plug tube.
• Install the new ignition coil, ensuring it is seated properly.
• Reattach the electrical connector and secure with bolts.

4. Test Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a multimeter to test the injector resistance (should match OEM specifications).
• If the injector is faulty, replace it with a new one.
• Reconnect the injector and any associated connectors.

5. Check for Vacuum Leaks

• Inspect the intake manifold gasket and vacuum hoses for any signs of wear or damage.
• Use a smoke test or carb cleaner to check for leaks while the engine is idling.
• Repair or replace any damaged components as necessary.