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

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

Solution

1. Preparation

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

2. Inspect the Air Intake System

• Tools Required: Socket set, flashlight.
• Instructions:
  1. Visually inspect the entire air intake path from the air filter to the intake manifold.
  2. Check for any cracks or loose fittings in hoses and connections.
  3. Tighten any loose clamps or replace damaged hoses as necessary.

3. Check the MAF Sensor

• Tools Required: MAF cleaner, screwdriver.
• Instructions:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector.
  3. Remove the sensor using the screwdriver.
  4. Clean the sensor using MAF cleaner; do not touch the sensor elements.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Instructions:
  1. Locate the fuel rail and connect the fuel pressure gauge per the manufacturer's specifications.
  2. Turn the ignition to the "ON" position without starting the engine to check the pressure.
  3. Compare the reading to the vehicle’s specifications; if low, inspect the fuel pump and filter.

5. Inspect Fuel Injectors

• Tools Required: Multimeter, injector cleaner.
• Instructions:
  1. Disconnect the fuel injector connectors.
  2. Use the multimeter to test the resistance of each injector; replace any that are out of specification.
  3. If injectors are clogged, consider using an injector cleaner or replacing them.

6. Reassemble Components

• Tools Required: Torque wrench, socket set.
• Instructions:
  1. Reconnect any components that were removed or disconnected during inspection.
  2. Ensure all electrical connectors and hoses are securely attached.
  3. Reconnect the negative battery terminal.