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Home/Cars/Tesla/Model 3/Highland (2024-present)/how to fix the P0171 code in a Tesla Model 3 Highland (2024-present)

how to fix the P0171 code in a Tesla Model 3 Highland (2024-present)

Tesla Model 3 Highland (2024-present)

Severity: highDifficulty: mediumError Code: P01712-4 hours
3 min read
576 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 lean air-fuel mixture issue in Tesla Model 3 Highland. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0171
Component
Engine
Repair Time
2-4 hours

Safety Warnings

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

Symptoms

  • •Check engine light illuminated
  • •Decreased engine performance
  • •Rough idle
  • •Poor fuel economy
  • •Engine stalling during acceleration

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm the P0171 code.
  2. 2Inspect the air intake system for any visible leaks or cracks, especially around the intake manifold and vacuum hoses.
  3. 3Check the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
  4. 4Inspect the mass air flow (MAF) sensor for dirt or damage, and clean or replace as necessary.
  5. 5Verify the operation of the fuel injectors using a noid light or multimeter to check for proper voltage and signal.
  6. 6Examine the engine's vacuum system for leaks, using a smoke test if necessary.

Solution

Solution

1. Preparation

  • Gather tools and parts needed.
  • Disconnect the negative terminal of the battery to prevent electrical shorts.
  • Ensure the engine is cool before starting work.

2. Inspect and Repair Air Intake System

  • Tools Required: Screwdriver set, vacuum gauge, smoke machine (optional)
  • Visually inspect the air intake ducting for cracks or loose connections.
  • If cracks are found, replace the damaged ducting or re-secure loose connections.
  • Check all vacuum hoses for leaks; replace any damaged hoses.

3. Clean or Replace MAF Sensor

  • Tools Required: MAF cleaner (or isopropyl alcohol), soft cloth
  • Carefully disconnect the MAF sensor connector.
  • Remove the MAF sensor from the intake system.
  • Spray MAF cleaner onto the sensor element and allow it to dry completely.
  • Reinstall the MAF sensor and reconnect the wiring harness.

4. Check Fuel Pressure

  • Tools Required: Fuel pressure gauge
  • Locate the fuel rail and attach the fuel pressure gauge.
  • Turn the ignition to the "On" position without starting the engine to check for fuel pressure.
  • Compare the reading with manufacturer specifications; if the pressure is low, consider replacing the fuel pump.

5. Test Fuel Injectors

  • Tools Required: Noid light or multimeter
  • Disconnect the fuel injectors and connect the noid light to the injector harness.
  • Crank the engine and check if the light flashes, indicating injector pulse.
  • If no pulse is detected, further diagnose the injector circuit or replace the injectors if they are faulty.

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
  • Fuel pressure gauge
  • Screwdriver set
  • MAF cleaner
  • Noid light
  • Multimeter
  • Vacuum gauge
  • Smoke machine

Parts Required

  • MAF sensor (if cleaning does not resolve the issue)
  • Fuel pump (if fuel pressure is low)
  • Vacuum hoses (if any are damaged)

Additional Information

Error CodeP0171
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

8 items

Parts

3 items

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