So here's the story:

I was driving to work and after a couple miles the EPC light turned on and my car engine shut off. I coasted to the side of the road and turned off my car. I turned it on and tried to start, no go. I turned it off and on again and tried to start, it took a little longer than normal but it turned on, now the EPC light and the CEL are on. I don't want to mess it up so I leave it there and get a ride to work. At work I do research and everything was pointing to the Engine Speed Sensor. So after work I stop by the Audi dealership and get one because they closed at 6. I go to Autozone to borrow their code reader and go to my car to read the codes I got the following codes: P0688, P0011, P1475, P0136. None of them said Engine Speed Sensor Well it was getting late and I didn't want to leave my car on the side of the rode so I decided I was going to risk driving it home. When I turn the car it it started as fast as normal. The EPC light was off and the CEL was still on (I didn't clear the codes). It drove home fine, no problems. I did some more google searches this morning and it still seems like the engine speed sensor even though I didn't get that code.


Here are the codes and meanings:
P1475 - EVAP control system LDP malfunction/signal circuit
P0011 - "A" camshaft position - timing over-advanced
P0688 - ECM power relay sense circuit open
P0136 - Heated oxygen sensor - bank 1 sensor 2

So my questions are:
1) Anyone know what it could be?

2) Could it still be the engine speed sensor and the code reader I used wasn't good enough to read the engine speed sensor code?

Any help would be great! Thanks!