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Home/Cars/BMW/5 Series/F10/F11 (2010-2017)/how to fix P0171 code on my BMW 5 Series F10/F11 (2010-2017)

how to fix P0171 code on my BMW 5 Series F10/F11 (2010-2017)

BMW 5 Series F10/F11 (2010-2017)

Severity: mediumDifficulty: mediumError Code: P01712-4 hours
3 min read
542 words

Problem Statement

## Problem Statement The P0171 code indicates a "System Too Lean (Bank 1)" condition in a BMW 5 Series F10/F11 (2010-2017), which suggests that there is insufficient fuel in the air-fuel mixture for o

Error Code
P0171
Repair Time
2-4 hours

Safety Warnings

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

Symptoms

  • •Check engine light illuminated
  • •Rough idle or stalling
  • •Decreased engine performance
  • •Poor fuel economy
  • •Increased engine noise
  • •Fuel odor from exhaust

Diagnostic Steps

  1. 1Scan the vehicle's OBD-II system for error codes and freeze frame data.
  2. 2Inspect the air intake system for leaks, including hoses and clamps.
  3. 3Check the mass air flow (MAF) sensor for proper operation and contamination.
  4. 4Inspect fuel system components, including the fuel filter and fuel pump pressure.
  5. 5Test the oxygen sensor functionality using a multimeter.
  6. 6Examine the vacuum lines for cracks or loose connections.

Solution

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

  • Tools Required: Socket set, screwdrivers
  • Inspect the air intake hoses for cracks or looseness. Replace any damaged hoses.
  • Ensure that the MAF sensor is clean. Remove the sensor and clean it with MAF cleaner. Do not touch the sensor element.
  • Reinstall the MAF sensor securely.

3. Fuel System Check

  • Tools Required: Fuel pressure gauge
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure. Compare to specifications in the service manual.
  • If the pressure is low, check the fuel pump operation and replace the fuel filter if clogged.

4. Oxygen Sensor Inspection

  • Tools Required: Multimeter
  • Locate the oxygen sensor(s) and disconnect the electrical connector.
  • Use a multimeter to check the voltage output of the sensor while the engine is running. It should fluctuate between 0.1 to 0.9 volts.
  • Replace any faulty oxygen sensors.

5. Reassembly and Final Checks

  • Reconnect any components that were removed during the inspection.
  • Reconnect the negative battery terminal.
  • Clear the error codes using an OBD-II scanner.

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

  • Inspect the air intake hoses for cracks or looseness. Replace any damaged hoses.
  • Reinstall the MAF sensor securely.

Parts Required

  • Air intake hoses (if damaged)
  • MAF sensor cleaner
  • Fuel filter (if clogged)
  • Oxygen sensor (if faulty)

Additional Information

Error CodeP0171
Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

2 items

Parts

4 items

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