DPF-Bank 1 about threshold

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I have 2.0 TDI audi c7. I have engine management light on. When i scan for error codes i get dpf bank 1 above threshold. Recently, i got my dpf cleaned, i was told by mechanic that it wasn't bad but still he carried out forced regen and everything. 

-no limp mode

-regenerates every 200-250 miles

-soot mass calculated/measurd below 25g. 

-45mpg combined mileage (not bad)

But i have noticed that sometimes soot mass measured goes in negative value. And at idle my dpf sensor voltage is above 1V. 

I dnt understand why my engine management light is on because of dpf although my car is not in limp mode i have done about 1000+ miles with warning light on. 

Could someone plz help me to get rid of engine management light? 


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With everything that you have said about the history of the regen it sounds to me like a sensor or wire fault. 

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