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

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Sub-steps:
  1. Remove the ignition coil from cylinder 1 by unscrewing its retaining bolts.
  2. Pull the ignition coil off the spark plug.
  3. Use a spark plug socket to remove the old spark plug.
  4. Inspect the spark plug for signs of wear (e.g., carbon buildup).
  5. Install the new spark plug, tightening it to the manufacturer-recommended torque (typically around 13-15 ft-lbs).
  6. Reattach the ignition coil.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench
• Sub-steps:
  1. Remove the connector from the ignition coil.
  2. Unbolt the ignition coil from its mounting.
  3. Install the new ignition coil and secure it with bolts.
  4. Reconnect the ignition coil connector.

4. Test Fuel Injector

• Tools Required: Noid light, multimeter
• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Connect a noid light to the injector connector to check for signal while cranking the engine.
  3. If no signal is present, check wiring and ECM; replace the injector if it’s faulty.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• Sub-steps:
  1. Visually inspect all hoses and the intake manifold for cracks or disconnections.
  2. Use a smoke machine to introduce smoke into the intake system; watch for leaks.
  3. Repair or replace any damaged hoses or gaskets.