Hello All
A newbie from south London here with a problem
I bought a mercedes A class 51plate earlier this year and recently its causing me some grief. The secondary air pump stays on even when the engine is switched off, im driving around with it unplugged at the momement but will have to get it fixed at some point.The thing is ive taken it to a garage and there not sure whats causing it to stay on.
Im hoping some one here could help

Thanks