my Tesla Outback has a check engine light and code P0171, what does it mean?

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface.
• Disconnect the negative terminal of the battery for safety.

2. Inspect and Repair Air Intake System

• Sub-steps:

  • Visually inspect the air intake hose for cracks or loose fittings.
  • Replace any damaged hoses or clamps.
  • Clean the MAF sensor with MAF cleaner (do not touch the sensor element).

• Tools Required:

  • Screwdriver set
  • MAF cleaner

3. Check Fuel System

• Sub-steps:

  • Disconnect the fuel pump relay and use a fuel pressure gauge to check the fuel pressure at the rail.
  • Replace fuel filter if pressure is below specifications (refer to manufacturer's specifications).
  • If pressure is low, replace the fuel pump.

• Tools Required:

  • Fuel pressure gauge
  • Replacement fuel filter (if needed)
  • Socket set

4. Inspect Vacuum Lines

• Sub-steps:

  • Visually inspect all vacuum lines for wear, cracks, or disconnections.
  • Replace any damaged lines as necessary.

• Tools Required:

  • Pliers
  • Replacement vacuum hoses (if needed)

5. Reconnect Battery and Clear Codes

• Sub-steps:

  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the P0171 code and any other stored codes.

• Tools Required:

  • OBD-II scanner