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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before proceeding with work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum pressure gauge, smoke machine (if available)
• Use a vacuum pressure gauge to check for leaks in the intake system.
• If leaks are detected, replace damaged hoses or gaskets.
• If available, use a smoke machine to identify hard-to-find leaks.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or electrical cleaner
• Remove the MAF sensor from the intake duct.
• Spray MAF cleaner on the sensor elements and allow it to dry completely before reinstallation.
• Reinstall the MAF sensor, ensuring it is securely fastened.

4. Test Fuel System Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition to the "ON" position without starting the engine to check the fuel pressure.
• Ensure the pressure meets the manufacturer's specifications (usually around 43-47 psi for most vehicles).
• If pressure is low, consider replacing the fuel pump or checking the fuel filter.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit (optional), multimeter
• Disconnect the fuel injector connectors.
• Use a multimeter to check the resistance of each injector; replace any that are out of specification.
• If necessary, use an injector cleaning kit to clean clogged injectors.

6. Clean Throttle Body

• Tools Required: Throttle body cleaner
• Remove the air intake hose to gain access to the throttle body.
• Use throttle body cleaner and a soft brush to clean the interior surfaces of the throttle body.
• Reinstall the air intake hose securely.