My 95 SL 320 has an Oxygen sensor mounted before the Catalytic converter and
another one which is called an Oxygen sensor "Probe" after the Catalytic
converter. Some months back the CEL came on and code P0141, "O2 sensor
heater circuit bank 1 sensor 2" was displayed. I cleared the code and
everything appeared to be OK for a while. The CEL came back on again
yesterday and I am planning on replacing the Oxygen sensor before the
Catalytic converter. I have reason to believe that it is the one that has
the heating element.
Now I am curious about the function of this O2 sensor "Probe". MY 129
service DVD does not appear to address this part. At least I have not been
able to find it yet.
Any tips will be appreciated,