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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 measurements on the connector of one of the other known good O2 sensors and measured 10 ohms across the two terminals farthest from the rounded end of the connector. That seems like a reasonable resistance for a heater circuit. Can someone verify that these terminals are in fact the heater? I could not find any information regarding the circuits or signals on this connector and do not yet own any service documentation for the car.

Thanks in advance!
 
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