how do I fix the P0171 code in my Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0171 engine running too lean 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 negative battery terminal to ensure safety while working on electrical components.

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 check for leaks around the intake manifold and vacuum lines.
  3. If a leak is found, replace the damaged hose or gasket as necessary.

3. Fuel System Inspection

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Start the vehicle and check that fuel pressure is within the manufacturer's specifications (typically around 50-60 psi for many models).
  3. If pressure is low, inspect the fuel pump and replace it if necessary.

4. Mass Air Flow (MAF) Sensor Testing

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and clean the sensor with MAF cleaner.
  3. Reconnect and test voltage output using a multimeter while the engine runs; compare readings to manufacturer specifications.
  4. Replace the MAF sensor if readings are outside of normal range.

5. Fuel Injector Cleaning/Replacement

• Sub-steps:
  1. Disconnect the fuel injectors from the fuel rail.
  2. Use a fuel injector cleaning kit to clean the injectors or replace them if they are clogged or malfunctioning.
  3. Reinstall the cleaned or new injectors, ensuring proper seating and connection.