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 needed for the repair.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the battery to prevent any electrical issues.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, screwdriver.
• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a vacuum gauge to test for leaks; if any are found, replace the affected hoses.
• Ensure all clamps are tight and secure.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, torx screwdriver.
• Remove the MAF sensor from the intake duct.
• Use MAF cleaner to spray and clean the sensor elements; allow it to dry completely.
• Reinstall the MAF sensor securely.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge, appropriate adapters.
• Connect the fuel pressure gauge to the fuel rail according to manufacturer specifications.
• Start the engine and monitor the fuel pressure; it should be within the specified range for the vehicle.
• If the pressure is low, check the fuel pump and filter for issues.

5. Inspect Throttle Body

• Tools Required: Throttle body cleaner, socket set.
• Remove the throttle body from the intake manifold.
• Clean the throttle body with throttle body cleaner to remove carbon buildup.
• Reinstall the throttle body and ensure all bolts are torqued to the specified values.