how to resolve P0301 misfire code in my Toyota Corolla E210 (2019-2024)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary using a socket set.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil using a socket wrench.
• Extract the spark plug from cylinder 1 using a spark plug socket.
• Inspect the spark plug for wear or damage. Replace if necessary.
  • Tools Required: Spark plug socket, torque wrench.
  • Torque Value: 13 lb-ft (18 Nm) for spark plug installation.

3. Check and Replace Ignition Coil

• Visually inspect the ignition coil for cracks or signs of arcing.
• If the coil is faulty, install a new ignition coil.
• Reconnect the ignition coil connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel rail to access the fuel injector for cylinder 1.
• Disconnect the fuel injector electrical connector.
• Remove the fuel injector using a suitable puller.
• Inspect the injector for clogs; clean or replace as necessary.
• Reinstall the fuel injector and reconnect the electrical connector.

5. Check for Vacuum Leaks

• Inspect vacuum hoses and intake manifold gaskets for leaks.
• Use a smoke machine or carburetor cleaner to identify any leaks.
• Repair or replace damaged hoses or gaskets as needed.

6. Reassemble and Test

• Reinstall any components removed during the inspection.
• Reconnect the negative battery terminal.
• Start the engine and monitor for any misfire codes or check engine light reappearance.