If it won't start I would say there's a good chance it's the crank sensor, a scan with vcds should confirm it. Mine did exactly the same, it would turn over but not fire then after a few attempts the glow plug light would flash, it would then display oil pressure warning.
If it is the crank...
Same here, looked after it , serviced it and still had to put up with the embarrassment every cold start,unfortunately you will come to the same conclusion as many other 2.0 170 owners that Audi crippled it quite badly with the dpf and egr and the only way of making it behave like a normal car...
Had the same problem on mine (2.0tdi 170 tdi 2007) , had quite a few things done in the past few months so not sure which one actually cured it but the main thing I think was the crank sensor, this caused the car to die and refuse to start with the coil light and oil pressure message.
This was...
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