Well, I was out doing routine scan on my CRD today. I was just idling in the drive way and everything was very quiet. Sure enough.... I heard a soft clunk now and then. About once a minute, sometimes twice. It sounded like it was coming from somewhere on the passenger side under the hood.
I too have not idea what it is. No codes. No malfunctions
2007 WK CRD, Quadradrive II, OEM Tow Hitch, GDE EcoTune, DPF-Delete, 4xGuard Front, Rear, Belly Guards, Side Rails & Full Matrix, OEM Skids, EHM, Dash Duck.