Why has my Nissan Qashqai had worse mpg since the engine computer system update?

I got a Nissan Qashqai 1.2 petrol from a main dealer at 9 months and 6000 miles and have run 3000 since then. Do you know anything about the recalled engine computer system update? On the first service...

Overfuelling Polo GTI

Is there a known problem with high oil consumption in the current Twincharged Polo GTI 1.4?

Overfuelling SEAT Cordoba with black smoke

I have a 1999 SEAT Cordoba TDI. All of a sudden it started overfuelling, with black smoke.

Green simplicity

I am interested in the overfuelling problem about which you often comment. Can you please tell me if this affects diesel engines as well as petrol engines? It seems strange to me that with all the latest...