how to fix P0301 code on Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Spark Plug

• Remove the ignition coil cover (if applicable).
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from cylinder 1 (using a socket set).
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear and replace with a new one if necessary (gapping as per manufacturer specifications).

3. Check and Replace Ignition Coil (if needed)

• Verify the ignition coil's resistance using a multimeter; compare to specifications.
• If faulty, install a new ignition coil onto cylinder 1:
  • Position the new ignition coil in place.
  • Reconnect the electrical connector.
  • Reinstall any covers removed during access.

4. Examine and Replace Fuel Injector (if necessary)

• Disconnect the fuel injector connector.
• Remove the fuel rail (if needed) to access the injector.
• Test the injector for proper operation using a fuel pressure gauge or by checking the resistance.
• Replace the injector if it fails the test:
  • Install the new fuel injector and reattach the fuel rail.
  • Reconnect the fuel injector connector.

5. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and let it idle.
• Check for any error codes using the OBD-II scanner; ensure no new codes appear.