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

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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Repair Air Intake System

1. Visual Inspection:
   • Check the entire air intake duct for signs of damage or loose fittings.
2. Tighten Connections:
   • Ensure that all clamps and fittings are secure.
3. Replace Damaged Components:
   • If any cracks or leaks are found in the intake manifold or duct, replace the affected parts.

3. Check and Clean MAF Sensor

1. Access MAF Sensor:
   • Locate the MAF sensor in the air intake system.
2. Remove MAF Sensor:
   • Detach the electrical connector and unscrew the sensor from the intake.
3. Clean MAF Sensor:
   • Use MAF sensor cleaner to spray and clean the sensor element. Avoid touching the sensor with fingers.
4. Reinstall MAF Sensor:
   • Secure the sensor back in place and reconnect the electrical connector.

4. Inspect Fuel System

1. Check Fuel Pressure:
   • Connect a fuel pressure gauge to the fuel rail and turn the ignition to the ‘ON’ position without starting the engine. Ensure the fuel pressure meets manufacturer specifications.
2. Replace Fuel Filter:
   • If fuel pressure is low, consider replacing the fuel filter if applicable.
3. Test Fuel Injectors:
   • If necessary, replace any faulty injectors identified during the balance test.

5. Final Checks

1. Reconnect Battery:
   • Reconnect the negative battery terminal.
2. Clear Codes:
   • Use the OBD-II scanner to clear the P0174 code from the ECM.
3. Test Drive:
   • Drive the vehicle under various conditions to ensure the issue is resolved.