Problems with NOx system are typical for following BMW models:
BMW 1 series | E81; E81 LCI; E87 LCI; E82; E88
116i with N43B16 engine
118i; 120i with N43B20 engine
BMW 3 series | E90; E90 LCI; E91; E91 LCI; E92; E92 LCI; E93; E93 LCI
316i with N43B16 engine
318i; 320i with N43B20 engine
325i; 330i with N53B30 engine
BMW 5 series | E60 LCI; E61 LCI
520i with N43B20 engine
523i with N53B25 engine
525i; 530i with N53B30 engine
BMW 5 series | F10; F11
523i; 528i; 530i with N53B30 engine
BMW 6 series | E63 LCI; E64 LCI
630i with N53B30 engine
