hi all, I have a polo 1.6 tdi with an error p2002000 (limit efficiency filtroantipolvere low)

The error is permanent and cannot be cancelled. The ****llo of soot in the filter is below the maximum, however, the error does not clear.
I assume, therefore, that both a sensor and mange.
The pressure differential has already been changed without result.

Anyone have any idea what this sensor is going to see????

Thanks