Car is BMW E90 LCI 335i xDrive N54. It has JB4, DCI, Alpina B3 TCU flash, MHD JB4 pump backend flash, map 5. Log is taken driving in normal city traffic on slow speeds. Check engine light and three error codes are triggered at he end of log where AFR and AFR2 jumps up and generate a big delta between them. Error codes are 2C31 Lambda probe in front of catalytic converter, trimming control. 2C2B Lambda probe in front of catalytic converter, system check and 2C6B Lambda probe behind catalytic converter, system check.