how to fix P0174 code in Tesla Model S Plaid/Refresh (2021-present)?

Learn how to diagnose and fix P0174 engine lean condition in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery for safety.
• Ensure the vehicle is parked on a flat surface with the engine off and cool.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to check for vacuum leaks around the intake manifold and hoses.
  3. Replace any damaged hoses or gaskets as needed.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor in the intake air duct.
  2. Disconnect the electrical connector and remove the sensor from the duct.
  3. Spray the sensor with MAF cleaner and allow it to dry completely before reinstallation.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel System Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and attach the fuel pressure gauge to the service port.
  2. Turn the ignition to the "ON" position without starting the engine to check the pressure.
  3. Compare the reading to the manufacturer specifications; replace the fuel pump if the pressure is low.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Inspect each injector for clogs or damage.
  3. Clean the injectors using an ultrasonic cleaner or replace them if they are faulty.
  4. Reinstall the fuel rail with injectors and ensure all connections are secure.

6. Verify Oxygen Sensor Functionality

• Tools Required: Multimeter or OBD-II scanner
• Sub-steps:
  1. Check the signal voltage of the oxygen sensor using a multimeter while the engine is running.
  2. Replace the oxygen sensor if it does not operate within the specified voltage range.