hi people, my dpf light is flashing randomly but also brings up 2 codes p0154 and c1119, the front oxygen sensor and lambda sensors have been changed and a forced re gen twice, and still the se codes come up, i know the p0154 is bank 1 sensor 1 oxygen sensor and the second is traction control /Reduction Inhibit Line , but on a live stream from speed sensors and everything else there is nothing, could this be a software fault? please help, btw its a mazda 6 2.0 diesel 2007