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!

 

Exhaust Emissions Carbon Monoxide Content After 2Nd Fast Idle Excessive

kylejames
kylejames
in Ford Fiesta Club

Featured Replies

Hi guys

Had a new lambda fitted 2 days ago and had my mot today. Failed for

"Exhaust emissions carbon monoxide content after 2nd fast idle excessive" they did the test twice the results are below.

Test one

1st fast idle test

Limits Actual

CO % VOL 0.20 0.49

2nd fast idle test

Limits Actual

CO % VOL 0.20 0.65

Test Two

Limits Actual

CO % VOL 0.20 0.77

2nd fast idle test

Limits Actual

CO % VOL 0.20 0.43

they put an additive in my fuel which said may have helped, but it didnt luckily they didnt charge me for it. Also failed on RBT service brake efficiency: 48%, they said I was only 2 off. They said a clean, adjust and lubricate of my rear brakes would sort it.

Does anyone have any advice?

  • Quote


    I'm sure I had a similar problem with my old fiesta, oxygen sensor went which meant that the engine was most likely running rich and using more fuel than it needed...this then in turn blocked up the cat and caused it to fail its mot on that

    The advice I was given was to try something like cataclean and give it an 'Italian tune up' down the motorway but as my mot had ran out I couldn't really do it, so unfortunately can't say if it works or not but I'm sure other members on here have had similar problems

    Sent from my iPhone using Ford OC

  • Quote

    • 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.

    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
      • 46 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.