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 tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
• Disconnect the negative terminal of the battery to ensure safety during repairs.

2. Inspect and Repair Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Check all intake hoses for cracks or loose connections.
• Tighten any loose clamps and replace any damaged hoses.
• If a significant leak is found, replace the affected components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver
• Locate the MAF sensor in the intake system.
• Disconnect the electrical connector and unscrew the sensor from its housing.
• Clean the sensor with MAF cleaner and allow it to dry completely.
• Reinstall the sensor, ensuring it is securely fastened, and reconnect the electrical connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, safety goggles
• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and check the fuel pressure reading against the manufacturer’s specifications.
• If the pressure is low, check the fuel pump and filter for obstructions and replace as necessary.

5. Inspect Vacuum Lines

• Tools Required: Visual inspection tools
• Visually inspect all vacuum lines connected to the intake manifold.
• Replace any lines that show signs of wear, cracking, or disconnection.