Trying to install my 4-wire o2, and I can't find a good guide that gives the right pins to route everything to. My sensor is the Bosch 4-wire with 1 black, 1 grey and 2 whites. The paper in it says black is the signal, whites are the heater and grey is ground.
Here's what I have done:

Sensor harness
Black Old oxygen sensor wire
White1 A6 (OBD1 harness)
White2 Ground on T-stat housing
Grey Ground on T-stat housing

still throwing a code 41.

 

the two whites. one is sensor power, the other is sensor heater. thats your problem, its not suppose to be grounded in two spots. which white wire doesnt matter. they both get the 12v