how to resolve the P0171 code on my Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Repair Air Intake System

• Tools Required: Visual inspection tools
• Check all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Replace any damaged hoses.
• Inspect the intake manifold for leaks using a smoke machine or similar tool. Repair any identified leaks.

3. Test and Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the intake.
• Clean the sensor with MAF sensor cleaner and allow it to dry completely.
• Reinstall the sensor and reconnect the electrical connector.

4. Fuel System Inspection

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail schrader valve.
• Start the engine and monitor fuel pressure; it should meet manufacturer specifications (typically 50-60 psi for most systems).
• If pressure is low, inspect the fuel pump and fuel filter for issues. Replace as necessary.

5. Check Fuel Injectors

• Tools Required: Injector cleaning kit
• Remove the fuel injectors using appropriate tools.
• Clean the injectors with an injector cleaning kit or replace them if they are clogged or faulty.
• Reinstall the injectors ensuring proper sealing.

6. Clear Codes and Test Drive

• Use an OBD-II scanner to clear the P0171 code.
• Test drive the vehicle to ensure proper operation and monitor for any reoccurrence of the code.