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Home/Cars/BMW/5 Series/F10/F11 (2010-2017)/why does my BMW 5 Series F10/F11 (2010-2017) check engine light come on after filling gas

why does my BMW 5 Series F10/F11 (2010-2017) check engine light come on after filling gas

BMW 5 Series F10/F11 (2010-2017)

Severity: mediumDifficulty: medium2-4 hours
3 min read
483 words

Problem Statement

## Problem Statement The check engine light on a BMW 5 Series F10/F11 (2010-2017) illuminates after refueling, indicating a potential issue with the fuel system or emission controls.

Repair Time
2-4 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before opening any components related to the fuel system.

Symptoms

  • •Check engine light illuminated
  • •Possible rough idle after refueling
  • •Fuel odor near the vehicle
  • •Decreased fuel economy
  • •Engine stalling shortly after refueling

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to identify specific trouble codes.
  2. 2Inspect the fuel cap for proper sealing and any signs of damage.
  3. 3Check for fuel leaks around the fuel tank, lines, and injectors.
  4. 4Examine the EVAP system components, including the purge valve and charcoal canister, for functionality.
  5. 5Verify the operation of the mass airflow sensor (MAF) and oxygen sensors (O2).
  6. 6Test the fuel pressure and monitor for any irregularities.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Ensure the vehicle is parked on a flat surface and the engine is cool.
  • Disconnect the battery to avoid electrical shorts.

2. Inspect and Replace the Fuel Cap

  • Remove the fuel cap and inspect for cracks or wear.
  • Clean the sealing surfaces on the fuel neck.
  • Replace the fuel cap with a new OEM part if damaged.
  • Reinstall the fuel cap securely.

3. Check and Repair EVAP System

  • Access the EVAP system components, including the purge valve and charcoal canister.
  • Inspect for cracks, blockages, or leaks in the EVAP hoses.
  • Replace any faulty components with new OEM parts.
  • Ensure all connections are tight and secure.

4. Test and Replace Faulty Sensors

  • Use a multimeter to test the mass airflow sensor (MAF) and oxygen sensors (O2) for proper operation.
  • Replace any sensors that are out of spec based on manufacturer specifications.

5. Clear Error Codes

  • Reconnect the battery after completing repairs.
  • Use the OBD-II scanner to clear any stored error codes.
  • Start the engine and monitor for the check engine light.

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
  • Socket set
  • Multimeter
  • Torque wrench

Parts Required

  • Fuel cap (if damaged)
  • EVAP purge valve (if faulty)
  • Charcoal canister (if damaged)
  • MAF sensor (if faulty)
  • O2 sensors (if faulty)

Additional Information

Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

4 items

Parts

5 items

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