how can I solve the P0171 code issue in my Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before working on the intake or fuel system.

2. Inspect for Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold and throttle body.
• Use a smoke machine or carburetor cleaner to identify leaks. If the idle changes or the smoke is drawn in, repair the leaks.
• Replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Disconnect the MAF sensor connector and remove it from the air intake duct.
• Use MAF sensor cleaner to clean the sensor element carefully. Allow it to dry completely before reinstalling.
• If cleaning does not resolve the issue, replace the MAF sensor with a new part.

4. Check Fuel Delivery

• Locate the fuel pump relay and fuse; ensure they are functioning properly.
• Use a fuel pressure gauge to check fuel pressure at the fuel rail. It should meet manufacturer specifications (usually around 50-60 psi).
• If the pressure is low, replace the fuel filter and check the pump for proper operation.

5. Oxygen Sensor Testing

• Inspect the oxygen sensor wiring for any signs of wear or damage.
• Use a multimeter to test the oxygen sensor's voltage signal; it should fluctuate between 0.1 to 0.9 volts.
• If the sensor is faulty, replace it with a new one.