FAULTBASE
Error CodesASKCars
© 2025 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
Home/Cars/Tesla/Model S/Plaid/Refresh (2021-present)/how to fix P0171 lean code in Tesla Model S Plaid/Refresh (2021-present)

how to fix P0171 lean code in Tesla Model S Plaid/Refresh (2021-present)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes
Severity: highDifficulty: mediumError Code: P01712-4 hours
3 min read
586 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0171 fuel system issue in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0171
Affected Component
Fuel System
Estimated Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before performing any repairs.

Symptoms

  • •Check engine light illuminated
  • •Poor fuel economy
  • •Engine stalling or hesitation during acceleration
  • •Rough engine idle
  • •Increase in engine temperature

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0171 and check for additional codes.
  2. 2Inspect the air intake system for any signs of leaks or damage, particularly around the intake manifold and vacuum hoses.
  3. 3Check fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
  4. 4Test MAF (Mass Air Flow) sensor functionality with a multimeter or scan tool.
  5. 5Inspect the fuel injectors for clogs or malfunctions by performing a visual inspection and a resistance test.
  6. 6Examine the engine coolant temperature sensor for proper operation, as incorrect readings can affect fuel mixture.

Solution

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

  • Tools Required: Socket set, vacuum gauge.
  • Inspect the intake manifold and vacuum hoses for any visible cracks or disconnections.
  • Use a vacuum gauge to check for leaks; if any are found, replace damaged hoses.

3. Clean or Replace MAF Sensor

  • Tools Required: Torx screwdriver, MAF cleaner.
  • Carefully remove the MAF sensor using a Torx screwdriver.
  • Spray MAF cleaner on the sensor elements and let it dry. Do not touch the sensor elements with your fingers.
  • Reinstall the MAF sensor, ensuring it is seated properly.

4. Check and Adjust Fuel Pressure

  • Tools Required: Fuel pressure gauge.
  • Connect the fuel pressure gauge to the fuel rail test port.
  • Start the engine and observe the pressure reading. If it is below specifications, check the fuel pump and filter.
  • If faulty, replace the fuel pump or filter as necessary.

5. Inspect and Clean Fuel Injectors

  • Tools Required: Injector cleaning kit or ultrasonic cleaner.
  • Remove the fuel injectors from the rail.
  • Clean the injectors using an injector cleaning kit or ultrasonic cleaner based on the manufacturer's recommendations.
  • Reinstall the cleaned injectors and ensure they are properly seated.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Vacuum gauge
  • •Socket set
  • •Torx screwdriver
  • •Fuel pressure gauge
  • •Injector cleaning kit or ultrasonic cleaner
  • •MAF cleaner

Parts Required

  • •Fuel filter (if replacement is necessary)
  • •Fuel pump (if replacement is necessary)
  • •Vacuum hoses (if damaged)

Additional Information

Error Code
P0171
Affected Component
Fuel System
Estimated Time
2-4 hours
Difficulty
medium
Severity
high
Tools Required
7 items
Parts Required
3 items

Related Faults

  1. why does my Tesla Model S Plaid/Refresh (2021-present) feel like it's dragging while driving?

    Learn how to diagnose and fix dragging issues in your Tesla Model S Plaid. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

    Brakes5 symptoms

  2. my Tesla Model S Plaid/Refresh (2021-present) won't shift into gear when I try to drive

    Learn how to diagnose and fix transmission issues in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

    Transmission5 symptoms

  3. why is my Tesla Model S Plaid/Refresh (2021-present) battery gauge fluctuating

    Learn how to diagnose and fix fluctuating battery gauge issues in Tesla Model S Plaid (2021-present). Step-by-step guide with diagnostic procedures and repair instructions.

    Electrical5 symptoms

  4. my Tesla Model S Plaid/Refresh (2021-present) won't start, just clicks, what should I do?

    Learn how to diagnose and fix the no-start issue in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

    Electrical5 symptoms

  5. why does my Tesla Model S have a knocking sound when I start it

    Learn how to diagnose and fix a knocking sound during startup in Tesla Model S. Step-by-step guide with diagnostic procedures and repair instructions.

    Electrical5 symptoms

  6. why is my Tesla Model S Plaid/Refresh (2021-present) having issues with the torque converter

    Fix torque converter issues in Tesla Model S Plaid (2021-present) with our detailed guide. Includes symptoms, diagnostics, tools, and repair steps.

    Transmission5 symptoms

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation