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 code in Tesla Model S Original (2012-2020)

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

Tesla Model S Plaid/Refresh (2021-present)

Error Codes
Severity: highDifficulty: mediumError Code: P01712-4 hours
3 min read
598 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 engine too lean condition in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0171
Affected Component
Engine
Estimated Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical components.
  • ⚠Allow the engine to cool before opening the intake or fuel system components.

Symptoms

  • •Check engine light illuminated
  • •Poor acceleration or performance
  • •Rough idle
  • •Decreased fuel economy
  • •Unusual engine noises (e.g., hissing or whistling)
  • •Increased emissions

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm the P0171 code and check for any additional codes.
  2. 2Inspect the air intake system visually for any signs of leaks or damage, including the air filter and intake manifold.
  3. 3Check fuel trims using a diagnostic tool to verify the fuel mixture and see if it correlates with the P0171 code.
  4. 4Inspect the fuel system, including the fuel pump and fuel pressure regulator, for proper operation and fuel delivery.
  5. 5Test the mass air flow (MAF) sensor to ensure it is functioning correctly and providing accurate readings.
  6. 6Examine vacuum hoses for any cracks, leaks, or disconnections that may be affecting air intake.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the vehicle's battery to prevent electrical shorts.
  • Ensure the engine is cool before starting work.

2. Inspect and Replace the Air Filter

  • Remove the air filter cover by unscrewing the retaining screws.
  • Take out the old air filter and inspect it for dirt and blockages.
  • Install a new air filter that meets OEM specifications.
  • Reattach the air filter cover and secure it with screws.

3. Check and Repair Vacuum Leaks

  • Visually inspect all vacuum hoses connected to the intake manifold.
  • Replace any damaged or cracked hoses with new ones.
  • Use a smoke machine or carburetor cleaner around potential leak areas to identify leaks.

4. Test and Clean the MAF Sensor

  • Disconnect the electrical connector from the MAF sensor.
  • Remove the MAF sensor from its housing using a Torx screwdriver.
  • Clean the sensor using MAF cleaner spray; do not touch the sensor with your fingers.
  • Reinstall the MAF sensor and reconnect the electrical connector.

5. Inspect and Test Fuel System

  • Check the fuel pump operation by listening for the pump when the ignition is turned to the ON position.
  • Measure the fuel pressure at the fuel rail with a fuel pressure gauge; it should be within specified range (typically around 50-60 psi).
  • Replace the fuel pump or fuel pressure regulator if pressures are incorrect.

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
  • •Socket set
  • •Torx screwdriver
  • •Fuel pressure gauge
  • •MAF cleaner spray
  • •Screwdrivers
  • •Multimeter

Parts Required

  • •New air filter
  • •Replacement vacuum hoses (if damaged)
  • •MAF sensor cleaner
  • •Fuel pump (if faulty)
  • •Fuel pressure regulator (if faulty)

Additional Information

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

Related Faults

  1. my Tesla Model S Plaid/Refresh (2021-present) won’t charge what should I check

    Learn how to diagnose and fix charging issues in Tesla Model S Plaid. Step-by-step guide with symptoms, diagnostic steps, and solutions.

    Electrical6 symptoms

  2. how do I fix the transmission slipping in my Tesla Model S Plaid/Refresh (2021-present)?

    Learn how to diagnose and fix transmission slipping in Tesla Model S Plaid (2021-present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

    Transmission5 symptoms

  3. 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

  4. why does my Tesla Model S Plaid/Refresh (2021-present) have difficulty shifting gears

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

    Transmission6 symptoms

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

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

    Electrical5 symptoms

  6. why is my Tesla Model S Plaid/Refresh (2021-present) battery range decreasing quickly

    Learn how to diagnose and fix rapid battery range decrease in Tesla Model S Plaid (2021-present). Step-by-step guide with diagnostic procedures and solutions.

    Electrical5 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