Replaced the lambda sensor on son's 306 XSi this afternoon as Pug dealer said it was showing a fault code. Wiring was exactly the same colours so no problem there and it came out fairly easily ! Problem is that the engine management light is still on and it idles roughly still. Obvious question -- does he now need to take it back and have the fault cleared from the ECU or is there any other way to reset it?
TIA
cheers, Len