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Stick them up for sale, not easy to get them to work well in a stock set up.

The only thing I have done was fit a iPod link to the head unit which works throught the canbus system.

Not too many choices with the factory systems but they sound great for stock.

I take mine in once a year to them,software update free,and 12 months free road side cover.so it makes the main dealer price about the same as most garages.

With that mileage it might be your Dpf pig fat tank running low if you have dpf of course
Like Harvey said get it plug on Vida dice and they will know

Take it back to the garage to get the codes downloaded,or have you got your own reader.
Just a though have a look on the dip stick engine oil level I am sure it should not be filled to the max,it...