Lexus Repair: o2, hp racing, modual

Question
plz help
i have a 1997 sc300 2jz-ge
i replaced the cats with a high flow header and exaust.  
CEL says o2 sesors
if i reset my ECU my car runs fine
once CEL comes on my car runs like shit
unless @ WOT
this makes daily driving a bitch
both before cat 02 sensors are new
the guy that exaust removed the rear sensors and used a modual from HP racing
CAN THE LACK OF RESISTANCE IN THE HEATING ELEMENTOF THE O2 SENSOR TRIP THE CEL AND CAUSE ALL THIS?
if so how much resistance do i need

PLZ HELP
i will be forever greatfull


Answer
Hello Aaron, When the ECU is scanned it should tell you if it is the #1 or #2 O2 sensor. #1 is the first one and #2 is the one after the cat. This will give you a little better idea which is the problem. Sounds like it may be the module that was installed.