hi, I recently was driving my Golf 6, 1.6TDI 105 HP CAYC engine, smoothly on the Highway at 120 Km/h on cruise control. Suddenly cruise switched off and car started to loose poweer. I had a OBD gizmo with me and I quickly conncted it and found out that injector number 3 was the culprit. carried on on tickover along the hard shoulder whilst calling a tow. I stoped after 3 to 5 kilometers as I was coming to an area wehre someone else was also broken down and it was climbing up hill. My local mechanic advised me to go for 4 injectors as the other ones probably could go wrong. As here in Portugal injectors are very expensive, I ordered them froma reputable company in Germany. Now, after the replacment, the ECU has no errors but the engine smokes like hell and it sounds rough. We tried then using the 3 original still in working order injectors together with one of the new ones. Recoded, etc. but it was even worst. Now I ahve the new ones, which are recons, it sound a little better but it is still very smoky. In fact so smoky that after a few kilometres the back of the car is black and the exaust is dirty. Eventually, I fear my CAT and DPF as well as EGR will be damaged. Can anyone tell me what went wrong? I think my mechanic uses Delphi for recoding the Injectors. I am thinking that maybe substequent software updates on these Diagnostik/Recoding Equioment are adapted for the retunings used after the Dieselgate modifications. My CAYC engine is till in its original state with probably the last software available in 2016. Waht can I do to solve this problem? I have a technical inspection coming up and I am sure it will fail like this. Mechanic thinks the new injetors are crap. But then I think if it was so the original ones would have worked together with one new one. But they do not. I fear the mechanich might have erased or recoded the engine without realising it or chose a diferent type of engine, like a CAYA or CAYB. Something stinks. Sepcial wehnn all the subsequent work was not even charged. Guilty Feeling? Perhaps? Thank you for your help. Best wishes.