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Speedometer fault on Ford Focus - what's the cause?

I have a 2001 Ford Focus 1.8 petrol. The car has covered 71,000 miles and is suffering from a speedometer fault. The issue is intermittent and it will stop for a few miles then start working again. Do you have any idea what could be causing this?

Asked on 15 September 2013 by ringo67

Answered by Honest John
The gasket to the speed sensor fails allowing transmission oil into the sensor. A £120 job to put right.

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