how to fix the P0301 misfire code in my Toyota Camry Eighth Generation (2018-present)?

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil by unscrewing the retaining bolt and disconnecting the electrical connector.
  2. Use a spark plug socket to remove the spark plug from cylinder 1.
  3. Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary with OEM specifications (typically NGK or Denso).
  4. Gap the new spark plug according to the manufacturer’s specifications (usually around 0.043 inches).
  5. Install the new spark plug and torque it to the manufacturer’s specification (typically around 13 ft-lbs).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the ignition coil was found defective, replace it with a new OEM ignition coil.
  2. Reinstall the ignition coil onto the spark plug and secure it with the retaining bolt.
  3. Reconnect the electrical connector ensuring a snug fit.

4. Check and Replace Fuel Injector

• Sub-steps:
  1. Remove the fuel rail if the fuel injector for cylinder 1 is faulty.
  2. Disconnect the fuel line using a fuel line disconnect tool (ensure to relieve fuel pressure first).
  3. Replace the faulty fuel injector with a new one, ensuring that O-rings are lubricated with clean engine oil.
  4. Reinstall the fuel rail and reconnect the fuel line, ensuring all connections are secure.

5. Reassemble and Test

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Start the engine and let it idle to check for smooth operation.
  3. Monitor for any check engine lights or misfire codes using an OBD-II scanner.

Tools Required:

• OBD-II scanner
• Socket set (including spark plug socket)
• Torque wrench
• Noid light (for fuel injector testing)
• Multimeter
• Fuel line disconnect tool

Parts Required:

• Spark plug (OEM recommended)
• Ignition coil (OEM recommended)
• Fuel injector (OEM recommended if faulty)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow engine to cool before opening the hood to prevent burns.
• Relieve fuel system pressure before disconnecting fuel lines.