Re: CE light code says O2 sensor - dealer says coils?
The thing is that, yes, they are 2 separate systems, but they both feed back to the same mothership. If there is a coil inducing a voltage spike that is making its way back to the pcm, NOTHING is impossible. Typically this causes a "dieout" concern. But I would not rule it out 100%
Having said that... I have personally not actually heard of this repair they speak of before... well coils failing I have, but not causing an O2 sensor code. Especially if it was just the express lane and they didnt actually "diagnose" it they just insta-diagnosed coils as the culprit, I wouldn't put much money on it actually fixing the problem. O2 sensors fail by themselves without coils' help.
There might be a starcase for the specific code you had and they just went off the starcase... its not one I have seen or heard of but honestly its the only logical thing that would explain the quick condemnation of coils for an O2 sensor fault.
2005 Jeep Grand Cherokee - Gone but not forgotten!