You didn’t tell us how many kays your T5 had done prior to the rebuild, but because you used the extended warranty I can assume the factory warranty had expired. VW, like all carmakers, will refuse to ...
My new Volkswagen T5 Transporter 2.0TDI 140PS has a DSG gearbox with a hazard. After slowing down for a junction or roundabout there's several seconds pause before it will respond to the accelerator.
Check the PCV valve, it might need replacing. A faulty PCV valve can cause a problem like you are describing. Disclaimer: You acknowledge and agree that all answers are provided as a general guide ...
The hot smelling with be the diesel particulate filter trying to regenerate. You might be able to sort it out by taking it for a 50 mile run, keeping it above 2,000rpm.