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

Solution

1. Preparation

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

2. Inspect Ignition Components

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connector from cylinder 1.
  3. Remove the ignition coil bolt using a socket.
  4. Pull the ignition coil out and inspect for cracks or carbon tracking. Replace if damaged.
  5. Remove the spark plug using a spark plug socket and inspect for wear or fouling. Replace if necessary.
  6. Install a new spark plug with a gap set to the manufacturer's specifications (typically 0.044 inches for the Corolla).
  7. Reinstall the ignition coil and connector.

3. Check Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a noid light to check for signal at the injector connector while cranking the engine.
  3. If no signal, inspect wiring and connectors for damage.
  4. If the injector is faulty, remove it using an injector puller, clean the mounting area, and install a new injector.

4. Test and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections around the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify leaks.
  3. Replace any damaged hoses or gaskets.