M5 Question

[bjd10201976]

Ive been searching for help to solve an issue with my e60 m5. I have been getting an increased emissions warning for quite some time. Recently after driving rather spirited the car lost a significantly and noticable amount of power. The only codes Im pulling are 2717 and 279D. When I reset the codes there is a lound clunk from under the hood as soon as I hit the reset button and the codes immediately come back. The car drives fine no rough idling or anything it just has no power at all. I changed the precat O2 sensors and still runs the same. Any help would be appreciated.

[MarcoZandrini]

PM bmwdirtracer. He’s a top notch tech. Tell him Mark sent you.