FAULTBASE
NEWSASKCars
© 2025 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
Home/Cars/BMW/X3/F25 (2011-2018)/how to fix P0174 code on BMW X3 F25 (2011-2018)

how to fix P0174 code on BMW X3 F25 (2011-2018)

BMW X3 F25 (2011-2018)

Severity: mediumDifficulty: mediumError Code: P01742-4 hours
3 min read
584 words

Problem Statement

## Problem Statement The vehicle is displaying a P0174 code, indicating a lean condition in bank 2 of the engine on a BMW X3 F25 (2011-2018).

Error Code
P0174
Repair Time
2-4 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Disconnect the battery before working on electrical components.
  • ⚠Allow the engine to cool before inspecting the intake system.

Symptoms

  • •Check engine light illuminated
  • •Rough idle when the engine is cold
  • •Decreased engine performance or acceleration
  • •Poor fuel economy
  • •Engine misfires under load
  • •Increased emissions

Diagnostic Steps

  1. 1Scan the vehicle's OBD-II system for error codes to confirm P0174 and check for any additional codes.
  2. 2Inspect the Mass Air Flow (MAF) sensor for dirt or damage, and clean or replace if necessary.
  3. 3Check for vacuum leaks in hoses and intake manifold using a smoke tester or visual inspection.
  4. 4Inspect the fuel system for low fuel pressure, including checking the fuel pump and fuel filter.
  5. 5Verify that the oxygen sensors are functioning correctly by checking their voltage readings.
  6. 6Examine the intake air ducts and throttle body for obstructions or leaks.

Solution

Solution

1. Preparation

  • Gather all necessary tools and parts.
  • Disconnect the negative battery terminal to prevent electrical shorts.
  • Ensure the vehicle is on a level surface with the parking brake engaged.

2. Inspect and Clean MAF Sensor

  1. Remove the MAF sensor from the air intake duct.
  2. Use MAF sensor cleaner to spray the sensing element, avoiding contact with other components.
  3. Allow the MAF sensor to dry completely before reinstalling it.
  4. Reconnect the MAF sensor and ensure it is seated properly.

3. Check and Repair Vacuum Leaks

  1. Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine to identify any hidden leaks in the intake manifold or vacuum lines.
  3. Replace any damaged hoses and ensure all connections are tight.

4. Test Fuel Pressure

  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect a fuel pressure gauge to the test port.
  3. Turn the ignition to the "ON" position (without starting) and check the pressure reading against the manufacturer's specifications.
  4. If the pressure is low, inspect the fuel pump and fuel filter for issues and replace as necessary.

5. Inspect Oxygen Sensors

  1. Locate the upstream and downstream oxygen sensors on bank 2.
  2. Use a multimeter to measure the voltage output of the sensors while the engine is running (the voltage should fluctuate between 0.1V and 0.9V).
  3. Replace any faulty oxygen sensors.

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
  • Multimeter
  • Fuel pressure gauge
  • MAF sensor cleaner
  • Basic hand tools (sockets, wrenches, screwdrivers)
  • Smoke machine (for leak testing)

Parts Required

  • Mass Air Flow (MAF) sensor (if damaged)
  • Vacuum hoses (if cracked)
  • Oxygen sensors (if faulty)
  • Fuel filter (if clogged)

Additional Information

Error CodeP0174
Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

6 items

Parts

4 items

Related Faults

Discover similar issues

  1. my BMW X3 F25 (2011-2018) has no power to the rear wheels when accelerating

    ## Problem Statement The BMW X3 F25 (2011-2018) is experiencing a loss of power to the rear wheels during acceleration, indicating a potential issue w...

    Symptoms
    • •No power to the rear wheels during acceleration
    • •Possible warning lights illuminated on the dashboard
    • +{count} more

  2. how to replace the fuel pump in my BMW X3 F25 (2011-2018)

    ## Problem Statement The fuel pump in a BMW X3 F25 (2011-2018) may fail, resulting in poor fuel delivery, engine stalling, or failure to start. This r...

    Symptoms
    • •Engine cranks but does not start
    • •Loss of power during acceleration
    • +{count} more

  3. why does my BMW X3 F25 (2011-2018) battery die overnight

    ## Problem Statement The battery of a BMW X3 F25 (2011-2018) is dying overnight, indicating a potential electrical drain or malfunction in the chargin...

    Symptoms
    • •Battery warning light illuminated on the dashboard
    • •Difficulty starting the engine in the morning
    • +{count} more

  4. my BMW X3 F25 (2011-2018) steering feels loose is this a common issue

    ## Problem Statement The steering on a 2011-2018 BMW X3 F25 feels loose, indicating a potential issue with the steering system or suspension component...

    Symptoms
    • •Loose steering feel
    • •Increased steering play
    • +{count} more

  5. why does my BMW X3 F25 (2011-2018) have a rough idle when cold

    ## Problem Statement The BMW X3 F25 (2011-2018) is experiencing a rough idle when the engine is cold, which may indicate issues related to fuel delive...

    Symptoms
    • •Rough engine idle when cold
    • •Engine stalling shortly after startup
    • +{count} more

  6. my BMW X3 F25 (2011-2018) has a rough start when cold what could be causing this

    ## Problem Statement The BMW X3 F25 (2011-2018) is experiencing a rough start when cold, indicating potential issues within the engine or fuel deliver...

    Symptoms
    • •Engine hesitates before starting
    • •Rough idle upon startup
    • +{count} more

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