dorsal900

Could someone tell me what the resistance is supposed to be for the heater circuit on the 4-wire (post cat) oxygen sensors? The car is a 1996 A4 2.8 V6, 101,000 miles.

I spliced in a new generic sensor to replace a defective one (one white wire was burned where it enters the sensor!); the new one measures 4.8 ohms between the two white wires, triggers the MIL after a few minutes. The other side (original sensor) measures 28 ohms between the white wires, no MIL for that side - but I hear that the resistance increases over time.

Seeing as how this is the post-cat sensor, I wasn't very picky about brand - all it is supposed to do is tell the ECU that the cats are working. I guess the ECU wants to see a heater resistance in a certain range - will probably need to replace it with a Bosch part.