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

Solution

1. Preparation

• Gather tools and required parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery negative terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, flashlight, hose clamp pliers
• Inspect all vacuum hoses connected to the intake manifold and throttle body for cracks or disconnections.
• Use a vacuum gauge to check for leaks in the intake manifold.
• Replace any damaged hoses or gaskets as necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner or isopropyl alcohol, soft brush
• Disconnect the MAF sensor connector.
• Remove the MAF sensor from the intake duct.
• Clean the sensor element with MAF sensor cleaner or isopropyl alcohol and a soft brush.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect Fuel System

• Tools Required: Fuel pressure gauge, basic hand tools
• Connect a fuel pressure gauge to the fuel rail.
• Start the engine and check the fuel pressure against manufacturer specifications.
• If pressure is low, inspect the fuel pump and filter for clogs or failures.
• Replace the fuel filter if it is dirty, and test the fuel pump operation.

5. Test and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner kit or ultrasonic cleaner
• Remove fuel injectors from the engine.
• Clean the injectors using a fuel injector cleaning kit or an ultrasonic cleaner.
• Reinstall the injectors ensuring proper sealing.