how to fix the P0301 code on my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1 by unbolting and disconnecting the electrical connector.
• Remove the old spark plug using the spark plug socket.
• Install the new spark plug and torque to the manufacturer's specification (typically around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil (if necessary)

• If the ignition coil was diagnosed as faulty, remove it as described in the previous step.
• Install the new ignition coil, ensuring it is seated properly.
• Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector from cylinder 1 by disconnecting the electrical connector and fuel line (ensure fuel pressure is relieved first).
• Use a fuel injector cleaner to clean the injector. If severely clogged, replace the injector with a new one.
• Reinstall the fuel injector, ensuring proper sealing and connection.

5. Check for Vacuum Leaks

• Inspect hoses connected to the intake manifold and throttle body for cracks or disconnections.
• Use carburetor cleaner to spray around suspected areas while the engine is running to identify leaks.

6. Compression Test (if necessary)

• Remove the spark plugs and connect a compression tester to cylinder 1.
• Crank the engine and record the compression reading; it should be within the manufacturer's specifications.
• If the compression is low, further investigation into the valve or piston condition is required.