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 tools and parts needed for the repair.
• Disconnect the vehicle's 12V battery to ensure safety.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify any leaks.
  3. Replace any damaged hoses or seals.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector and remove the MAF sensor from the housing.
  3. Clean the MAF sensor with MAF cleaner spray. Allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Sub-steps:
  1. Locate the fuel rail and attach a fuel pressure gauge.
  2. Turn the ignition to the "ON" position (do not start the engine) to check for initial pressure.
  3. Start the engine and observe the fuel pressure readings. Compare with manufacturer specifications (typically 50-60 psi).
  4. If pressure is low, consider replacing the fuel pump or checking for a clogged fuel filter.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the engine cover to access the fuel injectors.
  2. Inspect the injectors for any signs of leaks or clogging.
  3. If necessary, use an injector cleaner or replace faulty injectors.