What's the 2004 Audi S4 crank position sensor location?

The crankshaft position sensor typically needs to be located near the crankshaft, so that's where You should usually begin Your search. In the case of the 2004 Audi S4, You'll be able to find it pressed between the transmission and the engine block. It's quite difficult to get to in case You need a replacement, but it's still something that's possible to swap without the help of a professional mechanic. To complete the job, You'll need a 10mm wrench. You'll need to remove the coolant reservoir to get better access. Once You can slip Your wrench on, You're looking at a single bolt and wiring harness, so the change is really a breeze -- if You don't mind tight spaces. Plan to do this mostly by feel though, because You don't have much visibility where You're going.