Hello all! Need help.

Hello Everyone, i am new to Audi Sport.
I came here looking for some advice after searching the internet for hours i cant find anyone who has had the same problem.
If i have posed this in the wrong section, admin please just remove!

Well... Not long ago my Audi A3 8p 1.6FSI started to have a rough idle.
it would idle between 500RMP and 700RPM, bouncing up and down!

Then it started to get worse,
when driving, if i drop the clutch the Rev's drop to almost 100rpm, like the car is going to cut out.

It also struggles starting without any help from the accelerator.

Then my engine management light appeared. With the fault code P2208 #10 - NOx Sensor Heater Sense Circuit bank 1.

So... i changed the lambda sensor after posts online forwarded me to this.

One day later after clearing the code and replacing the sensor, all the same problems are still present! and the fault code re-appears!

Please if anyone could give me some advice on what this problem could be that would be great.

Thanks Jack

Hi MrLapou thank you for your response,
No i have not, how would i go about doing that? i have checked around the throttle body and seems all ok.

thanks

Hi S3eddiet, I had changed the sensor to a brand new one. any chance it could be faulty from the factory?

How would i check for vacuum leaks? is this with all the coolant pipes? and maybe the engine breather pipes blah blah?
thanks