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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative terminal of the battery.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench, gap gauge
• Remove the ignition coil from cylinder 1:
  1. Disconnect the electrical connector from the ignition coil.
  2. Remove the bolts securing the coil and pull it out gently.
• Remove the spark plug:
  1. Using a spark plug socket, turn counterclockwise to remove the spark plug.
  2. Inspect the spark plug for wear or carbon buildup.
• Install a new spark plug:
  1. Set the gap according to manufacturer specifications (typically 0.043 inches).
  2. Install the new spark plug and torque to the specified value (typically 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set
• Check the ignition coil for damage:
  1. If the coil is damaged or shows signs of wear, replace it.
• Install the new ignition coil:
  1. Position the new coil over the spark plug and secure it with bolts.
  2. Reconnect the electrical connector to the ignition coil.

4. Check Fuel Injector

• Tools Required: Fuel injector cleaner, multimeter
• Test the fuel injector:
  1. Disconnect the fuel injector connector.
  2. Use a multimeter to check the resistance of the injector (should be within manufacturer specifications).
• If faulty, replace the fuel injector:
  1. Remove the fuel rail if necessary, and replace the injector.
  2. Reassemble the fuel rail and reconnect all wiring.

5. Clear Codes and Test

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0301 code.
• Start the engine and monitor for any reoccurrence of the misfire.