I have an Audi A4 quattro 1.8L 1999 Avant. I got this code I have had it for awhile but it usually goes away on its own. So they told me it is the vehicle speed sensor well first of I don't know where that is located and second i think it is just loose. Would someone be willing to explain to me where it is located? or if i need to replace send me a link to a cheap site that sells it. Thank you!