A4 2 0 tdi 170 rough idle and white smoke when warming up. 2 0 tdi very rough idle when cold hi i have done a bit of a search on this one but wondered if you can shed some light on my issue. I also have the control emissions amber light on as well. 
				
			
										audi a3 2 0 tdi black edition sportback s tronic 5dr
											audi a3 2 0 fsi coolant temperature sensor location
											audi a3 2 0 tdi 184 remap
											audi a3 2 0 tdi downpipe
											audi a3 2 0 t review
											audi a3 2 0 tdi automatic
											audi a3 2 0 tdi 05
											audi a3 2 0 tdi co2 emissions