Originally Posted by RedInterior

Chased P0410 leisurely the last few years. Changed the little valve A 002 140 84 60, but the code kept returning. Did the full troubleshooting by the manual and this forum, found nothing wrong. I concluded the most likely part to cause the issue is the relay. Bought the M-B A 170 545 03 05 relay module and put it in last summer. No more P0410 faults. Some here say they have found the faults within these modules. I cannot find any bad solder or cracked foils in the one I removed. But I can say with confidence the replacement relay module fixed it.