Ex-speedingly good Fiesta

At 170,000 miles, my 2002/52 Fiesta 1.4 Diesel has developed a very intermittent problem with the speedo. Every few weeks the speedo stops working for a mile or so and then returns to normal. Sometimes the milometer also goes blank. Any ideas? (The car has averaged 62.9mpg with the only replacements a wheel bearing and a damper.)

Asked on 6 March 2010 by P.K., Grasby

Answered by Honest John
Oil is getting through the seals into the speed sensor on the final drive. Costs about £100 to have replaced.
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