The speedo in my car doesn't match the speed I'm actually driving at?

When driving, the speedometer in my Citroen C3 Picasso is showing a different speed to that which I'm actually driving it. How do I fix it?

Asked on 28 March 2017 by Brian Mcguinness

Answered by Honest John
The final drive speed sensor oil seal has probably failed. Costs about £100 to get it fixed.
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