QUOTE (butteguy @ Jun 12 2009, 10:11 AM)

Thanks, Brandon, I'll look into that.
Isn't that what the dealer would have done, though, is plug it into their scanner? They told me that it was something with my spark plugs, so they replaced them. Then, 2 weeks later they told me it was my starter, so they replaced that. Then, it was, oh christ, I don't remember...The 4th time they told me it was my starter, though, and I told them they just replaced that a month ago. "Yep, I guess we did, didn't we?" was the response I got. That was when I said screw you guys I'm not driving another 100 miles over here to have you tell me there's nothing wrong with my car. Luckily, all of this was on warranty, so all I had to pay was the gas to get there. I've dealt with the light being on for about 3 years now, and nothing bad has happened, so I'm not too worried about it.
BTW, Rob, all of this was happening at the VW dealership in Bozeman. Just lettin' you know, since I assume that's where you'd get one if you decide to buy a Jetta.
That is exactly what they do - plug in the scanner - but you can't see the results, and you don't really know what they are doing to fix it. For instance, I owned a Volvo and that thing had so many issues - they were fixing stuff left and right. The battery, no the fuel pump, no the ... - none of these things could be related! Without seeing the scanner you don't know if they are BS'ing you. What you do is you scan yourself, then bring it to the dealer - when they tell you your "fuel pump" is bad, then you can say - How does code "SC0001" relate to a fuel pump when I googled it and it has to do with my hubcaps? You get the point.
My truck was having issues where the 4th Cylinder was having a misfire - I didn't scan the thing until after they replaced the Exhaust/Air Valve for $600. They were BSing me. The car, when cold, just triggers the CEL to go off, but after it misfires once or twice, it is fine - I replaced the plug, coil, etc. so not much else could have been wrong with it.
I'm paraphrasing my experience, but you see the point. These scanners are about $150, but worth every penny, especially when you need it on your other car, or your friends want to borrow it (thanks Naffets!), or you just want the truth.