I have B5.5 that has P0056 and P0156 codes. Both of the post cat O2 sensors are "universal" non-OEM types. I suspect the bank 2 post cat sensor heater circuit was open causing the error and may now be shorted to chassis as it has caused fuse 34 to blow several times. I took some resistance...

I'm getting CEL code "P0056 HO2S Heater Circuit Bank 2 Sensor 2". Can someone tell me exactly which sensor that is and where its located on 01.5 V6? I couldn't find out by searching. Thanks! TH