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

Solution

1. Preparation

• Gather all tools and parts required for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect Air Intake System

• Remove the engine cover (if applicable) using a socket set.
• Visually inspect the air filter for dirt and replace if necessary.
• Check intake hoses for cracks or loose connections; replace any damaged hoses.

3. Check Fuel System

• Use a fuel pressure gauge to measure fuel pressure at the rail.
• If pressure is low, inspect the fuel pump and replace if defective.
• Check the fuel filter and replace if clogged.

4. Clean and Test Mass Airflow Sensor

• Locate the MAF sensor in the air intake pathway.
• Disconnect the MAF electrical connector.
• Remove the MAF sensor using a Torx screwdriver.
• Clean the MAF sensor with MAF cleaner spray and allow it to dry completely.
• Reinstall the MAF sensor and reconnect the electrical connector.

5. Inspect Engine Vacuum System

• Check all vacuum hoses for damage or disconnection.
• Use a smoke machine to detect any vacuum leaks.
• Replace any damaged or leaking hoses.

6. Verify Fuel Injector Operation

• Use a multimeter to test the resistance of the fuel injectors.
• If any injector is out of specification, replace it with a new one.
• Reinstall all components in reverse order of removal.