how to fix P0303 code in my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from cylinder 3.
  3. Remove the ignition coil by unscrewing it.
  4. Extract the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
  6. Install a new spark plug, tightening to the manufacturer-recommended torque (typically around 13-15 lb-ft).

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Use a multimeter to check the ignition coil’s resistance (consult specifications for the correct values).
  2. If the coil is defective, replace it with a new one.
  3. Reconnect the ignition coil to the spark plug and the electrical connector.

4. Inspect and Replace Fuel Injector (if necessary)

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 3.
  2. Remove the fuel rail bolts and carefully lift the rail to access the injector.
  3. Remove the old fuel injector and replace it with a new one, ensuring proper O-ring seating.
  4. Reinstall the fuel rail and reconnect the injector and fuel lines.

5. Reconnect Battery and Test

• Sub-steps:
  1. Reconnect the vehicle's battery.
  2. Start the engine and let it idle to ensure the check engine light is off.
  3. Take the vehicle for a test drive to confirm the repair.