Recently purchased a 2014 Audi A6 2.0 Diesel. First month was okay but after that It kept on blowing black Smoke when driving off but would stop once I was driving on the motorway. Slowly the car started constantly blowing thick black smoke and there was a loss of power when accelerating. No lights on the dashboard, my garage even pluged an OBD reader an was not showing any faults. The throttle responds is abit jerky and struggles to get above 2000 rpm. The car has now loss all its power and would not drive past 10mph has anyone had this issue before or knows the possible problem to this as myself or my mechanic can not find any problem with it.

 

 

Could be an issue with the dpf, maf, lambda sensor, egr etc. Odd there's no codes. 

8 minutes ago, Steve Q said:

Could be an issue with the dpf, maf, lambda sensor, egr etc. Odd there's no codes. 

My mechanic has taken the DPF and EGR off the system and whilst doing it he had said that an error poped up implying there was a fault with the throttle actuator but still not managed to find the actual problem.

So it could be the actuator. I'm assuming the dpf and egr weren't blocked. 

According to the mechanic the actuator is fine an may be a possible ECU fault. Could you please confirm if that could be the case.

Yes I think it could be an ECU issue, but I'm not mechanic 

The "smoke" looks very white to me. Could this possibly be a head gasket? could try a compression test.

1 hour ago, Anton8 said:

The "smoke" looks very white to me. Could this possibly be a head gasket? could try a compression test.

Good suggestion Tony. 

What mileage is the vehicle at ?

 

 

 

Did you find the cause of this problem? I have exact same problem with 2014 2.0 tdi ultra (90k on it), no warnings on dash, no errors on computer. Mechanic tried pump, filters, had injectors tested, drained fuel and replaced with more expensive premium diesel. All no difference to date.