I want to change my coils as a pre-requisite to getting my ECU looked at / fixed, but wanted to confirm a couple of things before I try and order anything 1. Can anyone confirm whether I need 2 or 3? coils as per this diagram item no 29 which shows on top of the engine. http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=124051&A=00069&M=104980&GA=722501&VIN=1240512B189721&CT=F&cat=15T&SID=54&SGR=255&SGN=07 2. I've seen various prices but as they differ so much wondered wether this things are sold separately or as a set? Does anyone know? Inchcape £92.53 Euro Car Parts £52.50 3. If they are priced separately and I need 3, then looks like its going to cost at least £157, is there a way or telling which if any are damaged or is it one of those things whereby its best just to replace them all?.. All advise most welcome, cheers!