Notchy steering on Fiesta - what's the cause?

The steering on my 2011 Ford Fiesta has a strange, notchy feel between 10 and 30mph, but my Ford dealer cannot anything wrong. They changed a CV joint and steering column joint, but this made no difference. Any ideas what the problem might be?

Asked on 16 November 2013 by Jeff Waters

Answered by Honest John
Uneven delivery of power to the electric power steering motor. Maybe a bad earth.
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