Hey guys, I'm kinda in the dumps right now and need some help. I have a 2000 s4 that turns over but won't start, this happened randomly and for no apparent reason. I've tried un hooking the battery as a friend said but that didn't help. I'm wondering if this is common and what the possible problems could be. A few ideas have been tossed around mainly that it could be the ecu... or a sensor. Other than that I'm lost and some insight from you guys will help a lot. Thanks!!