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

Solution

1. Preparation

• Gather necessary tools and parts for the repair.
• Disconnect the battery to prevent electrical shock.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil cover (if applicable).
• Unscrew and remove the faulty spark plug from cylinder 1.
• Inspect the old spark plug for wear; replace with a new spark plug if necessary.
• Torque the new spark plug to the manufacturer’s specifications (usually around 13 lb-ft).
• Reinstall the ignition coil.

3. Inspect/Replace Ignition Coil

• Tools Required: Socket set.
• Remove the ignition coil from cylinder 1.
• Inspect the coil for cracks or damage; test it using a multimeter for proper resistance.
• If faulty, replace with a new ignition coil and reconnect.

4. Check/Replace Fuel Injector

• Tools Required: Fuel injector removal tool, socket set.
• Disconnect the fuel line and electrical connector from the fuel injector.
• Remove the fuel injector from its rail.
• Inspect the injector for clogs and test its operation using a fuel pressure tester.
• Replace the fuel injector if found defective.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester and crank the engine to obtain a reading.
• Compare the reading to manufacturer specifications; if low, further engine diagnostics may be needed.