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

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the vehicle to cool down if the engine was recently running.

2. Inspect and Repair Air Intake System

• Tools Required: Vacuum gauge, hose clamps, screwdriver
• Inspect the entire air intake system for cracks or loose connections.
• Use a vacuum gauge to check for vacuum leaks; replace damaged hoses or tighten loose connections.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner (or appropriate cleaner), Torx screwdriver
• Remove the MAF sensor from the air intake duct.
• Spray the MAF sensor with the cleaner, ensuring not to touch the sensor elements.
• Allow it to dry completely before reinstalling.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge, wrench set
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (do not start the engine) and check the fuel pressure.
• If the pressure is below specifications, check the fuel pump and fuel filter for issues; replace as necessary.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaner, wrench set
• Remove the fuel injectors and visually inspect for dirt or clogs.
• Use an injector cleaning kit to clean the injectors or replace them if they are faulty.

6. Check Engine Coolant Temperature Sensor

• Tools Required: Multimeter
• Disconnect the sensor connector and use a multimeter to test its resistance.
• If the readings are outside manufacturer's specifications, replace the coolant temperature sensor.