My 2011 sportwagon with 120k miles needs another DPF (warrantee work at 66K but parts not covered after 2 yrs). Engine light on & soot in the tailpipe so probably cracked DPF. Still running OK. What's would your cost to replace with cheapest parts? DIY might be beyond my mechanic skill level and I don't own a code reader for reprograming anyway. Any suggestions on how to cut this cost??