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

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, vacuum gauge, smoke machine (optional)
• Visually inspect the air intake ducting for cracks or loose connections.
• If cracks are found, replace the damaged ducting or re-secure loose connections.
• Check all vacuum hoses for leaks; replace any damaged hoses.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner (or isopropyl alcohol), soft cloth
• Carefully disconnect the MAF sensor connector.
• Remove the MAF sensor from the intake system.
• Spray MAF cleaner onto the sensor element and allow it to dry completely.
• Reinstall the MAF sensor and reconnect the wiring harness.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and attach the fuel pressure gauge.
• Turn the ignition to the "On" position without starting the engine to check for fuel pressure.
• Compare the reading with manufacturer specifications; if the pressure is low, consider replacing the fuel pump.

5. Test Fuel Injectors

• Tools Required: Noid light or multimeter
• Disconnect the fuel injectors and connect the noid light to the injector harness.
• Crank the engine and check if the light flashes, indicating injector pulse.
• If no pulse is detected, further diagnose the injector circuit or replace the injectors if they are faulty.