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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
  2. Remove the spark plug using a spark plug socket and ratchet.
  3. Inspect the old spark plug for wear or damage.
  4. Install a new spark plug, ensuring the gap is set to manufacturer specifications (typically 0.043 inches).
  5. Torque the spark plug to the manufacturer's specifications (usually around 13 lb-ft).

3. Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil tests out of specification, replace it with a new coil.
  2. Install the new ignition coil onto the spark plug and secure it with the retaining bolts.
  3. Reconnect the electrical connector to the ignition coil.

4. Check for Vacuum Leaks

• Sub-steps:
  1. Inspect vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to detect leaks while the engine is running.
  3. Repair or replace any damaged hoses.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 code and check for any new codes.