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Home/Cars/Tesla/Model S/Plaid/Refresh (2021-present)/how to fix P0171 code on Tesla Model S Original (2012-2020)

how to fix P0171 code on 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
521 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 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 systems.
  • ⚠Allow the engine to cool before inspecting or working on it.

Symptoms

  • •Check engine light illuminated
  • •Decreased engine performance
  • •Rough idle or stalling
  • •Poor fuel economy
  • •Increased emissions

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm the P0171 code and check for additional codes.
  2. 2Inspect the engine vacuum system for leaks, particularly around hoses and intake manifold gaskets.
  3. 3Verify the operation of the mass airflow (MAF) sensor by checking its readings against specifications.
  4. 4Check fuel pressure using a fuel pressure gauge to ensure the fuel pump is delivering adequate pressure.
  5. 5Examine the fuel injectors for proper operation and signs of blockage or leaks.
  6. 6Inspect the air filter for cleanliness and proper installation, as a clogged filter can affect airflow.

Solution

Solution

1. Preparation

  • Gather all necessary tools and parts.
  • Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Vacuum Leaks

  • Sub-steps:
    • Visually inspect all vacuum hoses and connections for cracks or disconnections.
    • Use a smoke machine to identify hard-to-find leaks.
    • Replace any damaged hoses or gaskets as needed.

3. MAF Sensor Cleaning or Replacement

  • Sub-steps:
    • Remove the MAF sensor from the air intake duct.
    • Use MAF sensor cleaner to spray the sensor elements; do not touch them with any tools or fingers.
    • Allow the sensor to dry completely before reinstalling.
    • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Fuel System Inspection

  • Sub-steps:
    • Connect a fuel pressure gauge to the fuel rail.
    • Turn the ignition to the "ON" position without starting the engine to check the fuel pressure reading.
    • If pressure is below specifications, inspect the fuel pump and filter for blockages and replace if necessary.

5. Fuel Injector Service

  • Sub-steps:
    • Remove the fuel injectors from the engine.
    • Inspect for clogs and clean them using an ultrasonic cleaner or replace them if necessary.
    • Reinstall the cleaned or new fuel injectors with new O-rings.

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
  • •Smoke machine
  • •Multimeter
  • •Fuel pressure gauge
  • •Basic hand tools (sockets, wrenches, etc.)

Parts Required

  • •Vacuum hoses (if damaged)
  • •MAF sensor (if faulty)
  • •Fuel filter (if needed)
  • •Fuel injectors (if needed)

Additional Information

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

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