how to fix P0301 code in Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter.
• Ensure the vehicle is on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Unscrew the retaining bolts using a socket set.
  • Gently pull the coil out, ensuring no damage to the connector.
• Remove the spark plug:
  • Use a spark plug socket to carefully unscrew the spark plug from cylinder 1.
  • Inspect the spark plug for wear, carbon buildup, or damage.
• Replace the spark plug if necessary:
  • Use a new spark plug with the correct gap (as per manufacturer specifications).
  • Torque the new spark plug to the manufacturer's specification (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Check the ignition coil for cylinder 1:
  • Use a multimeter to test the primary and secondary resistance of the ignition coil.
• If faulty, replace the ignition coil:
  • Install the new ignition coil by reversing the removal steps.
  • Ensure the electrical connector is securely attached.

4. Check and Replace Fuel Injector

• Inspect the fuel injector for cylinder 1:
  • Disconnect the electrical connector and fuel line (using safety precautions to avoid fuel spray).
• Test the fuel injector's resistance with a multimeter.
• Replace the fuel injector if it fails the test:
  • Install the new injector and reconnect the fuel line and electrical connector.

5. Verify Engine Compression

• Perform a compression test on cylinder 1:
  • Remove the spark plug and insert the compression tester.
  • Crank the engine and record the compression reading.
• If the reading is below specifications, further investigation is required for internal engine issues.