how to fix the P0301 code in my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the engine is cool before beginning work.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil for cylinder 1:
  • Unplug the electrical connector.
  • Remove the retaining bolts using a socket set.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug.
• Inspect the spark plug for damage or excessive wear. If it appears faulty, replace it with a new spark plug (use OEM specifications).
• Reinstall the new spark plug and torque it to the manufacturer's specifications (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Check the ignition coil for cracks or signs of wear.
• If necessary, replace the ignition coil:
  • Install a new ignition coil by reversing the removal steps.
  • Torque the retaining bolts to the specified value (usually around 7-10 lb-ft).

4. Check Fuel Injector

• If the ignition coil and spark plug are fine, test the fuel injector:
  • Disconnect the fuel injector connector.
  • Use a fuel injector tester to ensure it operates correctly.
• Replace the fuel injector if it fails the test, following the same removal and installation procedures as the ignition coil.

5. Compression Test (if needed)

• If issues persist, perform a compression test:
  • Remove the spark plug from cylinder 1.
  • Insert the compression gauge into the spark plug hole.
  • Crank the engine and record the compression reading.
• If the compression is below specifications (typically around 120-180 psi), further inspection of the engine internals may be required.