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ppeter7
ppeter7
in Ford Mondeo / Vignale Club

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Hi there i have a 2001 mk3 mondeo 1.8 duratec petrol.just gone in for mot and hc abit high infact a fail.now ive tried redex and engine flushes but still high,but how ever when i took off the air pipe from the airbox to throttle body it passes emissions no probthis car hasnt a maf fitted either has had new airfilter fuel filter has any1 any ideas regards pete

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    Hi there i have a 2001 mk3 mondeo 1.8 duratec petrol.just gone in for mot and hc abit high infact a fail.now ive tried redex and engine flushes but still high,but how ever when i took off the air pipe from the airbox to throttle body it passes emissions no probthis car hasnt a maf fitted either has had new airfilter fuel filter has any1 any ideas regards pete

    high hc emissions is caused by a rich fuel mixture. could be due to worn spark plugs not burning the fuel properly or a lambda sensor. removing the air intake pipe is kinda proving this as you are now allowing a completely unrestricted airflow which is probably balancing the mixture

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    ok must be lambda as i had plugs done to at same time and all parts fitted was gen ford parts thanks again stef123

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    ok must be lambda as i had plugs done to at same time and all parts fitted was gen ford parts thanks again stef123

    The lambda sensors can be checked with a live data scanner. The front lambda sensor is the one you need to look at, it should be switching fairly quickly.

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    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
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