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Ford Fiesta rough/high idle?

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Recently my Fiesta 2006, 1.25 16v has been idling a little higher than usual after it has reached operating temperature. It's recently been serviced, with all new spark plugs. It's sitting at 98k miles on the clock, and other than this the car runs fine.

I have noticed that on occasion, it does smell like it's running a little rich. The front O2 sensor was changed a couple months back, when it threw a check engine light. The only thing I can think of being the problem, is the rear 02 sensor? Has anybody had some experience of this in the past?

Any help at all would be appreciated! :)



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