Originally Posted by dogwater
I forgot it is a wide band sensor,also if you use one of those anti fouler female couplers,it needs to be cut about 1/8 in. or less below the hex to get as much expoesure to the sensor as possible. It needs to be brazed or welded,no solder.
Are you sure? Wide band sensors are not 35 bucks. Narrow band sensors are though. Also the bosch 4 wire sensor you described sounds like most narrow band sensors you'll find on any newer car in the junk yard, I know because I use them fairly often.