how to fix P0301 misfire code in my Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil:
  • Unplug the electrical connector.
  • Remove the mounting bolt and gently pull out the ignition coil.
• Remove and inspect the spark plug:
  • Use a spark plug socket to carefully unscrew the spark plug.
  • Inspect for damage or excessive wear.
• Install the new spark plug:
  • Apply anti-seize compound to the threads (if applicable).
  • Torque the spark plug to the manufacturer’s specification (typically around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil shows signs of failure, replace it:
  • Remove the old ignition coil as described above.
  • Install the new ignition coil in the same position.
  • Reconnect the electrical connector.

4. Check Fuel Injector

• If the spark plug and ignition coil are functioning properly, test the fuel injector:
  • Disconnect the fuel injector connector.
  • Use a multimeter to test for resistance; compare with manufacturer specs.
  • If faulty, replace the fuel injector.

5. Inspect for Vacuum Leaks

• Visually inspect all hoses and the intake manifold for signs of wear or disconnection.
• Use a smoke machine or carburetor cleaner to identify any vacuum leaks.