how to fix the P0301 code in my Toyota Highlander XU70 (2020-Present)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary.
• Use a socket set to remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of wear or damage (e.g., carbon buildup, broken insulator).
• If necessary, replace the spark plug with a new one that meets OEM specifications.
• Torque the new spark plug to the manufacturer's recommended value (typically around 13 ft-lbs).

3. Inspect and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the ignition coil using a socket set.
• Inspect the ignition coil for cracks or signs of failure.
• If faulty, replace the ignition coil with a new one and ensure it is seated properly.
• Reconnect the electrical connector.

4. Inspect Fuel Injector

• Check the fuel injector for proper operation by removing it and inspecting the nozzle and electrical connector.
• Clean the fuel injector with an appropriate fuel injector cleaner if clogged.
• If necessary, replace the fuel injector with a new one and reconnect it properly.

5. Check for Vacuum Leaks

• Inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
• Replace any damaged vacuum hoses or connectors to ensure proper air intake.