how to fix P0171 code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0171 engine lean condition in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to avoid electrical shock.

2. Inspect and Repair Air Intake System

• Step 1: Visually inspect the entire air intake system from the air filter to the throttle body for cracks, loose connections, or leaks.
• Step 2: Replace any damaged hoses or components as needed.
• Step 3: Reconnect all fittings securely.

3. Clean or Replace MAF Sensor

• Step 1: Locate the MAF sensor in the air intake duct.
• Step 2: Carefully disconnect the electrical connector.
• Step 3: Remove the sensor using the appropriate socket (typically Torx).
• Step 4: Clean the sensor with MAF sensor cleaner; do not touch the sensing element.
• Step 5: If damaged, replace with a new MAF sensor.
• Step 6: Reinstall the sensor and reconnect the electrical connector.

4. Check and Adjust Fuel System

• Step 1: Attach a fuel pressure gauge to the fuel rail's service port.
• Step 2: Turn the ignition to the ON position (do not start the engine) and check the pressure reading.
• Step 3: If the pressure is below specifications (consult service manual), check for a clogged fuel filter or failing fuel pump.
• Step 4: Replace any defective components.

5. Inspect Vacuum Lines

• Step 1: Visually inspect all vacuum lines connected to the intake manifold.
• Step 2: Replace any cracked or damaged vacuum hoses.
• Step 3: Ensure all connections are secure and leak-free.