Audi a6 c7 2.0tdi code 19226

[Sohail123]

Hello everyone need some help

audi a6 c7 2.0 tdi mileage 86k miles

eml turned up last night i did a scan and error code was 19226 particular trap bank 1 efficiency below threahold. I checked the reading pressure sensor seems to be fine. Dpf is not clogged showing 8 grams of soot and last regeneration was done 1 day ago. My car normally goes on auto regen after every 240 miles. Am a taxi driver so loads of short runs. Car drives fine no power loss. Was thinking egr cooler but checked online that had different error code  p2002. What else that could be

[Steve Q]

Is it worth getting the dpf actually dismantled for inspection? 

Or a forced regen? I appreciate it regen'd the other day.