how to fix P0171 code in Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather necessary tools and parts. Ensure the vehicle is parked on a level surface with the parking brake engaged.
• Tools Required: OBD-II scanner, screwdriver set, vacuum gauge, fuel pressure gauge, multimeter, basic hand tools.
• Safety Warnings: Disconnect the battery before working on electrical components.

2. Repair Vacuum Leaks

• Step 1: Locate vacuum hoses connected to the intake manifold.
• Step 2: Inspect each hose for cracks, breaks, or disconnections.
• Step 3: Replace any damaged hoses with OEM parts.
• Step 4: Reattach all hoses securely and ensure there are no loose connections.

3. Clean or Replace MAF Sensor

• Step 1: Disconnect the MAF sensor connector.
• Step 2: Remove the MAF sensor from the intake.
• Step 3: Clean the MAF sensor using a specialized MAF cleaner. Do not touch the sensor element with your fingers.
• Step 4: Reinstall the MAF sensor and reconnect the electrical connector. If the sensor is faulty, replace it with a new one.

4. Inspect and Replace Fuel Filter

• Step 1: Locate the fuel filter in the fuel line.
• Step 2: Use the fuel pressure gauge to relieve pressure in the fuel system.
• Step 3: Disconnect the fuel lines from the filter using appropriate tools.
• Step 4: Replace the old fuel filter with a new OEM filter and reconnect the fuel lines securely.

5. Verify Fuel Pressure

• Step 1: Connect the fuel pressure gauge to the fuel rail.
• Step 2: Turn the ignition to the "ON" position (do not start the engine) and check pressure readings against manufacturer specifications.
• Step 3: If pressure is low, inspect the fuel pump and replace if necessary.