ADAC, an independent organization, backed by 20 million club members, subjected the Polo 1.2 TDI to the NEDC test cycle. The result? No more defeat device, but the emissions of NOx and CO2 weren't drastically cut.
However, ADAC found that before the update, the Polo was off by 10.2 percent regarding CO2 and 9.6 percent for fuel consumption. Remember, this is the NEDC, not a real world test, and the differences should be 0%. So it's a clear abnormality even without any connection to the Dieselgate scandal.
After the software update, ADAC subjected the car to several NOx tests and found that emissions could be lower by up to 22.9%. Fuel consumption, meanwhile, did go up, but only by between 0.5 to 2.7 percent.
All in all, the results suggest that the VW conversion can provide environmental benefits for the 1.2 TDI 3-cylinder diesel engine under real driving conditions, while the consumption and engine performance are hardly affected by the conversion. The VW Polo 1.2 TDI was tested with a manual 5-speed shift, and the same kind of powertrain can be seen on the affected Skoda Fabia and SEAT Ibiza models.
Not all the 1.2 TDI engines in the world are faulty, just the ones belonging to the EA189 family. Generally speaking, if you have a relatively recent Polo, Fabia or Ibiza and it says Euro 5 on it, it's got to go and be fixed. Owners are to be contacted via letter, instructing them to take their to a local dealer for a software update at no charge.
While the 2.0 TDI requires a special component that smooths out the flow of the air, the 1.2 TDI just gets new software. It's probably not the end of the Dieselgate recalls, as independent tests have discovered cheating software in modern Audis that are being built to this day.
At the end of the day, as long as there are no downsides, most customers should be happy with the outcome.