Volv0 S40

I'm selling a volvo s40. I have owned for about a year now, but it's just sitting up getting no milage iv replaced the battery earlier this year as it went dead in the winter and there's a new diesel filter gone in bout two weeks ago. The engine management light is on and its down on power while it was in the garage getting the new filter the mechanic said it because of the dpf as it's not getting the mileage it needs cleaning it's got nct till January and it's only done bout 700 km since last test and all it needed then was a wiper blade and tax is out end of September any questions just message as I work all day. May accept a swap for something smaller.