Skip to content
View in the app

A better way to browse. Learn more.
Ford Owners Club - Ford Forums

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.



Join the Independent Ford Owners' Club

Our community has been built by enthusiasts, for enthusiasts, and proudly run by Ford owners' for over 18 years. As an independent, non-official club, everything you’ll find here, advice, support, and opinions, comes directly from members with genuine Ford ownership experience.

Join our friendly community... it's Free!

 

Turbo Fail With K&n Xstreme Filter On

Ben_ashe
Ben_ashe
in Ford Focus Club

Featured Replies

Hey guys,

Tried fitting a k&n Xstreme air filter to my Focus ST-2 TDCi , got about 200m and then the turbo began to fail and the car was crying for an immediate service.

How do i tackle this problem?!

Cheers!

Ben

  • Quote


    • Author

    I have only seen a clip from youtube where the owner mentioned cutting 2mm off the rubber seal and his is working fine.

    Can it be that simple?

  • Quote

    Hi

    Turbo failing from an air filter, nah, sounds like a manufacturing defect on the turbo,

    Different engine but i have a Green cotton filter on my 1.6 116ps tdci (2013) and i have covered 22500 miles with it

    Jamie

  • Quote
    • Author

    It works perfectly fine with the original air filter in, but when i swap the K&N in the revs dont go up, the turbo doesnt kick in, Wont get past 50 mph even on a mile long straight

  • Quote

    Hi Ben

    Has it been mega over oiled perhaps thus strangling the engine

    thats all i can think of tbh

    Jamie

  • Quote

    Sounds more like its getting too little air. Sure the K&N isnt blocked in some way and that all the sensors are still connected and plugged in

    Had a K&N on mine since I got it, no problems at all, nor on my last 5 cars that have all had K&N's and most have done 200k+ miles

  • Quote
    • Like 1

    Latest Deals

    Ford UK Shop for genuine Ford parts & accessories

    Disclaimer: As the club is an eBay Partner, The club may be compensated if you make a purchase via the club

    Join the conversation

    You can post now and register later. If you have an account, sign in now to post with your account.
    Note: Your post will require moderator approval before it will be visible.

    Guest
    Reply to this topic...
    Go to topic listing

    The "Digestive"

    • The Digestive Forum Roundup (31st May - 7th June 2026)

      Steve ·
      The Digestive Forum Roundup (31st May - 7th June 2026) We hope you’re all enjoying your week and finding time for some time enjoying your Ford! This week, our vibrant forum has been buzzing with discussions that touch on a diverse range of Ford models, from the Mondeo to the Fiesta and Focus. Here’s a recap of some key conversations that might pique your interest. Starting with the Mondeo, user Frenchspanner shared a particularly frustrating issue relating to a 'Immobiliser Active' message appea
      Steve
      Steve
      • 128 views





    Background Picker
    Customize Layout

    Account

    Navigation

    Search

    Search

    Configure browser push notifications
    Chrome (Android)
    1. Tap the lock icon next to the address bar.
    2. Tap Permissions → Notifications.
    3. Adjust your preference.
    Chrome (Desktop)
    1. Click the padlock icon in the address bar.
    2. Select Site settings.
    3. Find Notifications and adjust your preference.