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Mk6 1.4 Zetec Running Rich

sean.round
sean.round
in Ford Fiesta Club

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Hi Guys,

My 1.4 Fiesta Zetec is running really rich at the moment. I am lucky if I crack 31mpg round town, yet, get 40-41mpg on the motorway... I occasionally get the Engine Managment Light come on, which if you clear with a DTC reader, wont come back on for months on end. Error code seems to signify Lambda Sensor, but I was wondering if anyone else had any other suggestions before I fork out for them?

Sean

  • Quote


    Sounds like lambda sensor not giving correct air/fuel mixture hence why you're going through so much fuel. My brother had a similar problem and after changing the lambda sensor 3 times the garage he was taking it to noticed he had a big hole in his back box. After that was replaced it was fine

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    • The Digestive Forum Roundup (24th May - 31st May 2026)

      Steve ·
      The Digestive Forum Roundup (24th May - 31st May 2026) We hope this email finds you well and enjoying your week. As always, our forum has been buzzing with activity, so we’ve compiled the highlights for you. Plenty of interesting discussions are taking place, especially around the Ford Focus and Fiesta models. Starting off with the Focus, many members have been discussing issues with the Emergency Call System, particularly in the Mk4 model. PLB raised concerns about persistent malfunctions, a se
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