A3 2.0tdi dpf problem

Benr95

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Having a bit of a problem with my dpf. Light keeps coming on but it’s not high on soot. Highest soot level I’ve seen is 28 and can do a force regen. But it is still doing a regen by itself and there’s no fault code when the light comes on
Have had the car scanned and see the 2nd exhaust temp sensor was reading 0.0 at the time but from what I’ve seen some people say there’s only 3 sensors?
anyone had a similar problem that could point me in the right direction?
 

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