I`m running a usdm p28 on a jdm d15b vtec. The ecu was giving me code 22 and code 41. For the 22 code since the d15b apparently doesnt have a VTP sensor ... i just taped the VTP to the VTSolenoid and the code vanished. OK Now my question is : will a code 41 (ie: primary oxygen sensor heater) make my p28 run in limb mode ? Cause its not letting me rev over 5000. I was just planning to get a 4 wire o2 sensor cause the d15b only uses 1 wire o2, so that should solve the prob... but i`m STILL not sure about this thing that its not letting me rev over 5000.... or could be somethin else ?? Any comments ? Btw: Anyone know a good place to buy a 4 wire o2 sensor at a good price ?