If you're not familiar with electronic diagnosis, it can be a bit tricky. These bimmers are very temperamental with their electronics. A Subaru just works and works well. IMO they are both just as difficult to work on mechanically. Parts are not that expensive but sometimes you HAVE to go with OEM or the car goes wacky.
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The Mind Is A Terrible Thing.
2004 Cayenne S
2005 Impreza WRX