how to fix a 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 with the engine turned off and cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

1. Remove the engine cover if necessary, using a socket set.
2. Remove the spark plug wire or ignition coil connector from cylinder 1.
3. Use a spark plug socket to unscrew and remove the spark plug from cylinder 1.
4. Inspect the spark plug for wear or damage; replace if necessary with OEM parts (typically NGK or Denso).
5. Apply anti-seize compound to the threads of the new spark plug.
6. Install the new spark plug and torque it to the manufacturer's specification (usually around 13-15 lb-ft).
7. Reconnect the ignition coil or spark plug wire.

3. Inspect and Replace Ignition Coil

1. Remove the ignition coil from cylinder 1 after disconnecting its electrical connector.
2. Inspect the coil for cracks or signs of wear. If faulty, replace with an OEM ignition coil.
3. Reinstall the new ignition coil and reconnect the electrical connector.

4. Check Fuel Injector (if necessary)

1. If misfire persists, remove the fuel injector from cylinder 1 with a socket set.
2. Inspect the injector for clogs or leaks. Clean or replace if necessary.
3. Reinstall the fuel injector and reconnect the fuel line.

5. Reconnect Battery

• Reconnect the battery once all repairs are completed.