toothandnail

got a code on a 2001 A8

17539 - Oxygen (Lambda) Sensor: B2 S1: Internal Resistance too High

I checked the wires and supply voltage as per the Bently manual

The resistants was too the high but really close on the sensor. I replace the sensor with a bosh sensor for that specific car and position. the code came back. Anyone have this happen?


Any ideas?

tozoM8

So you've replaced the driver's side upper O2 sensor and it throws the same code again?

toothandnail

correct

toothandnail

the latest
I cleared the code I also checked the ohms resistance on both precat sensors and they appear to be good. Remember the drivers side one is new.
I also checked the connectors at the ECM. CEL came back after a couple of days. However this time it is a different code. It is the other side ,same problem. So I checked both sensors with am ohm meter hoping I would find this one bad and found no difference. Any Ideas?

audinutt

check you ecm box for water