ok i ordered this OBDII splitter and had it in for a week so far and i haven't noticed any of
these OBDII using products not working. The ebay add said
"If it is just taking power or reading CAN data, it can be used at the same time.
Communication can be detected separately."
JB4 connects and seems to be giving data, Xforce varex mufflers work in manual, Matrix and Geolocation mode and as it was
split into 3 OBDII's i connected the OBDII diagnistic plug i had lying around.