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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shock.
• Allow the engine to cool before working on components.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1.
  • Tools Required: Socket set, ratchet
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage.
• If necessary, replace with a new spark plug that meets OEM specifications (typically NGK or Denso).
• Torque the new spark plug to the manufacturer’s specification (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil.
• If faulty, remove the ignition coil from cylinder 1.
  • Tools Required: Socket set
• Install a new ignition coil that meets OEM specifications.
• Reconnect the ignition coil connector.

4. Check and Clean Fuel Injector

• If the ignition components are functioning properly, check the fuel injector.
• Remove the fuel rail if necessary to access the injector.
  • Tools Required: Fuel line disconnect tool, socket set
• Test the injector for proper operation using a multimeter.
• If clogged, clean the injector with a fuel injector cleaning kit, or replace it with a new one.

5. Perform Compression Test

• If misfire persists, perform a compression test on cylinder 1.
• Follow manufacturer instructions for testing.
• If compression is low, further investigation into the engine’s internal components may be required.