how to fix P0171 code in Tesla Model 3 Highland (2024-present) and what does it mean?

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the negative terminal of the battery.
• Allow the engine to cool down before proceeding.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, flashlight.
• Remove the engine cover if applicable.
• Inspect all air intake hoses and connections for cracks or loose fittings.
• Tighten any loose clamps and replace any damaged hoses.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner spray, soft cloth.
• Locate the MAF sensor in the air intake duct.
• Disconnect the electrical connector and unscrew the sensor.
• Clean the sensor with MAF cleaner and allow it to dry, or replace it if damaged.
• Reinstall the sensor and reconnect the electrical harness.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail and attach the fuel pressure gauge.
• Start the engine and observe the pressure reading; it should match the specifications (usually around 50-60 PSI for many vehicles).
• If the pressure is low, inspect the fuel pump and filter for issues, and replace them if necessary.

5. Inspect and Repair Vacuum Lines

• Tools Required: Inspection mirror, flashlight.
• Visually inspect all vacuum lines connected to the intake manifold for wear or damage.
• Replace any cracked or disconnected lines.