how to fix P0301 code in my Toyota Camry XV70 (2018-2024)

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, multimeter, compression tester, and torque wrench.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Replace Spark Plug

• Sub-steps:
  1. Disconnect the negative battery terminal to prevent electrical shock.
  2. Remove the engine cover (if applicable) by unscrewing bolts with a socket set.
  3. Remove the ignition coil from cylinder 1 by unscrewing it and disconnecting the electrical connector.
  4. Remove the spark plug using a spark plug socket and ratchet.
  5. Inspect the old spark plug for signs of wear (such as excessive carbon buildup or damage).
  6. Install the new spark plug, ensuring it is gapped correctly to the manufacturer’s specifications (typically around 0.043 inches for the Camry).
  7. Torque the spark plug to the manufacturer’s specified torque value (around 13 ft-lbs).
  8. Reattach the ignition coil and the engine cover.

3. Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil tested faulty, remove it from cylinder 1 as previously described.
  2. Install the new ignition coil in the same position.
  3. Reconnect the electrical connector and ensure it clicks into place.

4. Clean or Replace Fuel Injector (if necessary)

• Sub-steps:
  1. If the fuel injector is suspected to be faulty, disconnect the fuel line (use safety glasses and rags to catch any fuel).
  2. Remove the fuel injector by unscrewing the retaining clips or bolts.
  3. Clean the injector with a suitable cleaner or replace it with a new injector.
  4. Reinstall the injector, ensuring it is seated properly and reconnect the fuel line.

5. Perform Compression Test (if necessary)

• Sub-steps:
  1. Remove the spark plug from cylinder 1 (as previously done).
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and read the compression gauge.
  4. If compression is below specifications, further engine repairs may be needed.