how to fix P0171 lean code in Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.
• Allow the engine to cool before beginning work.

2. Inspect and Replace Air Intake Components

• Inspect the air intake: Check the intake hose and connections for cracks, loose fittings, or leaks. Replace if damaged.
• Replace the air filter: If dirty or clogged, replace the air filter with a manufacturer-approved part.

3. Fuel System Inspection

• Check fuel pressure: Use a fuel pressure gauge to measure pressure at the fuel rail. It should match manufacturer specifications (typically around 50-60 psi for most systems). If low, proceed to the next step.
• Inspect fuel pump and filter: If fuel pressure is low, test the fuel pump and replace the fuel filter. Ensure all connections are secure and leak-free.

4. MAF Sensor Cleaning or Replacement

• Remove the MAF sensor: Disconnect the electrical connector and carefully unscrew it from the intake manifold.
• Clean the MAF sensor: Use MAF sensor cleaner spray to clean the sensor element. Allow it to dry completely before reinstalling.
• Replace if necessary: If cleaning does not yield improvement, replace the MAF sensor with a new unit.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code and any other related codes.