Great information on the testing of O2 sensors. I believe that is my challenge with my car at this moment.
I was wondering if you know where I might be able to find the information on how to find the suitable replacement O2 sensors. I read some threads about using NGK/NTK sensors that are for other cars like Ford. Any thoughts. I have a '97 S420 M119 engine. I could not find anything in the search that would help me.