how to fix the P0301 code in my Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil for cylinder 1 by unbolting it and unplugging the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for damage. If it’s fouled or worn, replace it with a new one.
  • Torque: Install the new spark plug to the manufacturer’s specified torque (usually around 13-15 lb-ft).
• Apply a small amount of dielectric grease to the tip of the spark plug before reinstalling.

3. Inspect and Replace Ignition Coil

• Use the same tools to inspect the ignition coil for cylinder 1.
• If damaged, replace the ignition coil with a new one.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Check and Clean Fuel Injector

• If the fuel injector is suspected to be faulty, use a fuel injector cleaner or replace it.
• To clean, remove the fuel injector, soak it in a cleaning solution, and then reinstall.
• If replacing, ensure that the new fuel injector matches the specifications of the original.

5. Compression Test (if necessary)

• If misfire persists, perform a compression test.
• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1.
• Insert the compression gauge into the spark plug hole and crank the engine to get the reading.
• Compare the reading with the specifications. Low compression indicates a more serious engine issue that may require further investigation.