When asking for technical help at the very least let us know the version of firmware you are running.Cliff's Calibration (Mapping) Guide is a MUST READ: http://www.vemssupport.com/forum/index.php/topic,97.0.html
It can measure 0.7 lambda while driving the car,While calibrating lsu 4.2 i measured :88 ohm Rcal on sensor,145 o2 calibrationand with 100 ohm resistors and led:4v between pump- and gnd 0v between pump + and - (100 in vemstune)+450mV nerst and pump - (136 in vemstune), do you know if RI target is 165 in vemstune for old LSU 4.2 ? Or i have wrong value here?Procedure followed : http://www.vems.hu/wiki/index.php?page=GenBoard/Manual/WideBandHardwareTest