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

Learn how to diagnose and fix P0174 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.
• Allow the vehicle to cool down if the engine was running.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the intake hoses and connections for cracks or loose fittings.
  2. If any damage is found, replace the hoses or tighten connections as necessary.
  3. Clean the throttle body using throttle body cleaner and a soft cloth.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Carefully disconnect the electrical connector.
  3. Remove the MAF sensor using a Torx screwdriver.
  4. Clean the MAF sensor with MAF cleaner spray and let it dry completely before reinstalling.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (without starting the engine) and check the pressure.
  3. Compare the reading to the manufacturer's specifications (generally around 50-60 psi).
  4. If pressure is low, inspect the fuel pump and filter for clogs or failure.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  1. Remove the engine cover to access the fuel injectors.
  2. Check the wiring harnesses for damage and ensure all connectors are secure.
  3. Perform an injector balance test using a specialized tool or method as per manufacturer guidelines.
  4. Replace any faulty injectors identified during testing.