I have a skoda fabia 1.9 vrs tdi .. Decated while driving today under hard accelartion abt 3k revs the exhaust made a loud pop sound with black/blue smoke coming out.. And now the car is running limpy extreme loss in power ... What do i do ? What could it be?

Turbo?? :-/

intercooler pipe 

Will have to get it checked .. Hope i never had it decatted...

Boost pipe has blown off - happened to me a couple of weeks ago.

Most to least likely, and in English:-

 

Popped turbo pipe. Also easiest and cheapest to fix.

Blown turbocharger; check for signs of heavy lubricating oil cpnsumption to confirm.

Blown a lump out of the exhaust manifold. Really unusual, but it can happen, particularly if you've got a flawed casting.