how to fix P0174 code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0174 engine lean condition in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on the electrical systems.

2. Inspect and Repair Intake System

• Tools Required: Vacuum gauge, socket set, torque wrench
• Sub-steps:
  1. Visually inspect all intake hoses for cracks or wear.
  2. If cracks are found, replace the affected hoses.
  3. Tighten all hose clamps to specifications to ensure a solid connection.
  4. Inspect the intake manifold gasket for signs of wear or damage; replace if necessary.

3. Clean MAF Sensor

• Tools Required: MAF sensor cleaner, soft cloth
• Sub-steps:
  1. Locate the MAF sensor in the intake system.
  2. Carefully remove the MAF sensor from the intake.
  3. Spray the MAF sensor with the dedicated cleaner and allow it to dry completely.
  4. Reinstall the MAF sensor ensuring a snug fit.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail pressure test port.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition to the 'on' position (do not start the vehicle) and check for the specified pressure (refer to specifications).
  4. If the pressure is low, test the fuel pump and fuel filter for restrictions or failures.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0174 code and any other related codes.