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BMW

BMW Lower Engine Cover Undertray Splash Guard (Center/Centre Left) – Genuine OEM 51757241831 – Fits F20 F21 F22 F23 F30 F31 F34 F32 F33 F36, F80 M3, F87 M2 – 1/2/3/4 Series Underbody Panel Belly Pan Under Car Cover

BMW Lower Engine Cover Undertray Splash Guard (Center/Centre Left) – Genuine OEM 51757241831 – Fits F20 F21 F22 F23 F30 F31 F34 F32 F33 F36, F80 M3, F87 M2 – 1/2/3/4 Series Underbody Panel Belly Pan Under Car Cover

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BMW Centre Left Lower Engine Cover - OEM Floor Panel - Part Number 51757241831

Put the underside of your BMW back to how the factory intended with this genuine centre-left lower engine cover. Part number 51757241831 is the original BMW aerodynamic floor panel that tidies airflow, cuts road noise and protects vulnerable lines and components from dirt and spray. Ideal if your existing lower cover is cracked, missing or rattling, this centre-left floor liner is a direct-fit replacement across a wide range of F Series models including F20, F21, F22, F23, F30, F31, F34, F32, F33, F36, plus F80 M3 and F87 M2.

We have installed this part on multiple customer cars and our own builds, and the results are immediate: cleaner under-car airflow, fewer vibrations, a quieter cabin and proper shielding for brake and coolant lines. Customers consistently praise the fit and finish, the simple bolt-on install and the OEM quality you only get from a genuine BMW component.

  • Genuine BMW part for precise fit, correct mounting points and long-term durability
  • Replaces broken or missing lower engine cover to restore factory aero performance
  • Reduces wind noise and helps prevent underbody rattles and vibration
  • Shields the chassis underside from road grime, stones and water spray
  • Direct replacement centre-left floor shield for BMW F Series platforms

Fitment overview

Suits a broad range of BMW F Series applications: 1 Series F20 and F21, 2 Series F22 and F23, 3 Series F30, F31 and F34, 4 Series F32, F33 and F36, as well as F80 M3 and F87 M2. Popular models include 118d, 120d, 125i, M135i, M140i, 220d, 228i, 230i, M235i, M240i, 316d, 318d, 320d, 328i, 330i, 340i, 418d, 420d, 428i, 430i, 435d, 440i including xDrive variants where listed.

1 Series

  • 1' F20 (07/2010 to 02/2015)
    • 120d
  • 1' F20 LCI (05/2014 to 06/2019)
    • 118d, 118i, 120dx, 125d, 125i, M135ix, M140i, M140ix
  • 1' F21 LCI (05/2014 to 06/2019)
    • 120dx, 125d

2 Series

  • 2' F22 (10/2012 to 06/2017)
    • 220dx, 220i, 225d, 228i, 228ix, M235i, M235ix, M240i, M240ix
  • 2' F22 LCI (09/2016 to 12/2019)
    • 220dx, 220i, 225d, 230i, 230ix, M240i, M240ix
  • 2' F23 (04/2014 to 06/2015)
    • 228i, 228ix
  • 2' F23 LCI (09/2016 to 12/2019)
    • 218i, 220d, 220i, 225d, 230i, 230ix, M240i, M240ix

3 Series

  • 3' F30 (02/2011 to 07/2015)
    • 316d, 318d, 318dx, 320d, 320d ed, 320dx, 320i, 320ix, 325d, 328d, 328dx, 328i, 328ix, 330d, 330dx, 335i, 335ix, Hybrid 3
  • 3' F30 LCI (09/2014 to 10/2018)
    • 316d, 318d, 318i, 320d, 320d ed, 320dx, 320i, 320ix, 325d, 328d, 328dx, 328i, 328ix, 330d, 330dx, 330i, 330ix, 335dx, 340i, 340ix
  • 3' F31 (07/2011 to 07/2015)
    • 316d, 318d, 318dx, 320d, 320d ed, 320dx, 320i, 320ix, 325d, 328dx, 328i, 328ix, 330d, 330dx, 335dx, 335i, 335ix
  • 3' F31 LCI (09/2014 to 06/2019)
    • 316d, 318d, 318i, 320d, 320d ed, 320dx, 320i, 320ix, 325d, 330d, 330dx, 330i, 330ix, 335dx, 340i, 340ix
  • 3' F34 GT (07/2012 to 06/2016)
    • 318d, 320d, 320dx, 320i, 320ix, 325d, 328i, 328ix, 330d, 330dx, 335i, 335ix
  • 3' F34 GT LCI (09/2015 to 12/2019)
    • 318d, 320d, 320dx, 320i, 320ix, 325d, 330d, 330dx, 330i, 330ix, 335dx, 340i, 340ix

4 Series

  • 4' F32 (11/2012 to 02/2017)
  • 4' F32 LCI (05/2016 to 12/2019)
  • 4' F33 (03/2013 to 02/2017)
  • 4' F33 LCI (05/2016 to 12/2019)
  • 4' F36 Gran Coupe (07/2013 to 03/2017)
    • 418d, 418i, 420d, 420dx, 420i, 420ix, 428i, 428ix, 430d, 430dx, 430i, 430ix, 435dx, 435i, 435ix, 440i, 440ix
  • 4' F36 Gran Coupe LCI (05/2016 to 12/2019)

Not sure if this is the correct lower cover for your chassis. We offer a free compatibility check before dispatch. Add your UK registration or the last 7 of your VIN at checkout and we will confirm the match.

Installation and support

Professional fitting available at MJ Modifications in Warwickshire. For a fitting quote or technical advice, email info@mjmodifications.co.uk.

Part details

  • Part number: 51757241831
  • Manufacturer: BMW
  • Warranty: Two years manufacturer warranty for UK customers and one year for international customers when VIN is provided at checkout on compatible vehicles

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