how to fix my Toyota Camry XV50 (2012-2017) check engine light P0301

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the Engine Cover (if applicable):
  • Use a socket set to remove any bolts securing the cover.
• Remove the Spark Plug:
  • Use a spark plug socket and ratchet to carefully unscrew the spark plug from cylinder 1.
  • Inspect the spark plug for signs of wear, carbon buildup, or damage.
• Install New Spark Plug:
  • Use a torque wrench to tighten the new spark plug to the manufacturer’s specification (typically around 13-15 ft-lbs).
  • Reattach the spark plug wire or ignition coil.

3. Inspect and Replace Ignition Coil

• Remove the Ignition Coil:
  • Disconnect the electrical connector from the ignition coil.
  • Unscrew the ignition coil from the engine using a socket set.
• Install New Ignition Coil:
  • Position the new ignition coil in place and secure it with bolts to the manufacturer’s specification.
  • Reconnect the electrical connector.

4. Check Fuel Injector

• Inspect Fuel Injector:
  • Remove any components obstructing access to the fuel injector.
  • Check for proper connection and any signs of leaks.
• Test Fuel Injector Function:
  • Use a multimeter to check the resistance of the fuel injector; it should match specifications (typically 12-16 ohms).
• Replace If Necessary:
  • If the injector is faulty, remove it and install a new one, ensuring to use new O-rings.

5. Verify Repairs

• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.
• Clear the DTC using the OBD-II scanner and perform a test drive to confirm the issue is resolved.