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Home/Cars/Tesla/Model S/Plaid/Refresh (2021-present)/how to fix P0174 code in Tesla Model S Plaid/Refresh (2021-present)

how to fix P0174 code in Tesla Model S Plaid/Refresh (2021-present)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes
Severity: highDifficulty: mediumError Code: P01742-4 hours
3 min read
530 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 P0174 lean condition in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0174
Affected Component
Engine
Estimated Time
2-4 hours

Safety Warnings

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

Symptoms

  • •Check engine light illuminated
  • •Poor acceleration or engine performance
  • •Rough idle or stalling
  • •Increased fuel consumption
  • •Occasional backfiring or popping sounds
  • •Engine running hotter than normal

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0174 and check for additional codes.
  2. 2Inspect the air intake system for leaks, including hoses and gaskets.
  3. 3Check the fuel pressure using a fuel pressure gauge to ensure it meets specifications.
  4. 4Inspect and clean the mass air flow (MAF) sensor.
  5. 5Verify the operation of the fuel injectors using a multimeter.
  6. 6Check for vacuum leaks around the intake manifold and vacuum hoses.

Solution

Solution

1. Preparation

  • Gather tools and parts required for the repair.
  • Disconnect the negative terminal of the battery to ensure safety.
  • Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

  • Inspect for Leaks:
    • Visually inspect all air intake hoses and connections for cracks or loose fittings.
    • Replace any damaged hoses with OEM parts.
  • Clean MAF Sensor:
    • Remove the MAF sensor from the air intake duct.
    • Use MAF cleaner spray to clean the sensor elements. Allow it to dry completely before reinstalling.

3. Check and Adjust Fuel System

  • Test Fuel Pressure:
    • Connect a fuel pressure gauge to the fuel rail.
    • Turn the ignition on without starting the engine and check the pressure; it should be within manufacturer specifications (typically around 50-60 psi).
    • If the pressure is low, inspect the fuel pump and fuel filter for issues.
  • Inspect Fuel Injectors:
    • Use a multimeter to check the electrical resistance of each injector (should be around 12-16 ohms).
    • Replace any faulty injectors with new units.

4. Verify and Reassemble

  • After repairs, reassemble any components that were removed.
  • Reconnect the battery terminal.

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
  • •Multimeter
  • •Socket set
  • •Torque wrench
  • •MAF cleaner spray

Parts Required

  • •Replacement air intake hoses (if damaged)
  • •Fuel filter (if necessary)
  • •Fuel injectors (if faulty)

Additional Information

Error Code
P0174
Affected Component
Engine
Estimated Time
2-4 hours
Difficulty
medium
Severity
high
Tools Required
6 items
Parts Required
3 items

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