Egr off on this euro4 engine is that the working egr valve is programmed to stay in closed position.
When the egr valve is broken, then off course egr programmed to stay in closed position does not work.
You have as far as i can see a broken egr position sensor, this means the ecm does not know what position the valve has.
Mount a scrapyard egr valve (with working egr position sensor) and egr wil stay in closed position and no more soot will enter the engine.
With the soft egr off (egr is programmed to stay closed) dpf and regeneration will work as normal.
