how to fix P0301 code in Toyota Camry XV40 (2007-2011)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before working.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil from cylinder 1 by unscrewing the retaining bolt and gently pulling it out.
  2. Remove the spark plug using a spark plug socket and ratchet.
  3. Inspect the spark plug for signs of wear, deposits, or damage. Replace if necessary.
  4. Install the new spark plug, torque to the manufacturer's specification (typically around 13 ft-lbs).
  5. Reinstall the ignition coil and secure it with the retaining bolt.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is in good condition, test or replace the ignition coil.
  2. Disconnect the electrical connector from the ignition coil.
  3. Remove the ignition coil from the engine by unscrewing the bolts.
  4. Install the new ignition coil and torque the retaining bolts to the specified value.
  5. Reconnect the electrical connector to the coil.

4. Check Fuel Injector

• Sub-steps:
  1. Locate the fuel injector for cylinder 1 and disconnect the electrical connector.
  2. Remove the injector from the fuel rail by unscrewing it carefully.
  3. Inspect the injector for clogs or damage. Clean or replace if necessary.
  4. Reinstall the injector into the fuel rail ensuring a proper seal.

5. Address Vacuum Leaks

• Sub-steps:
  1. Inspect vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carb cleaner to detect any vacuum leaks.
  3. Replace any damaged hoses or gaskets as needed.