how to fix P0301 misfire in my Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Sub-steps:
  1. Remove the engine cover if equipped.
  2. Locate the spark plug of cylinder 1 (usually the front left of the engine).
  3. Disconnect the ignition coil connector.
  4. Remove the ignition coil using a socket.
  5. Unscrew the spark plug using a spark plug socket.
  6. Inspect the spark plug for wear; replace it with a new one if damaged (use OEM specifications).
  7. Install the new spark plug and torque it to the manufacturer’s specifications (typically around 13-15 lb-ft).
  8. Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter (optional), socket set
• Sub-steps:
  1. If the misfire persists, test the ignition coil using a multimeter for resistance (consult specifications).
  2. If out of range, replace the ignition coil with a new one.
  3. Reinstall the ignition coil and reconnect the connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (or replacement injector), safety goggles
• Sub-steps:
  1. Disconnect the fuel injector connector and remove it from cylinder 1.
  2. Use a fuel injector cleaning kit as per the manufacturer’s instructions to clean the injector.
  3. If cleaning does not resolve the issue, replace the injector with a new one.

5. Perform Compression Test (if necessary)

• Tools Required: Compression tester
• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine to take a reading; compare to manufacturer specifications.
  4. If compression is low, investigate potential internal engine problems.