Don't mean to flog a dead horse, but same deal here. '01 Durango R/T. Original O2 sensors, but cat is semi-new high flow 3"in/out Magnaflow cat. It was put on about 3-4 years ago when the headers and 3" system all the way to the back was put on. Been running great ever since. Decent (for a Durango) fuel economy. Total mileage around 95,000. New plugs and wires around 60K.
Can't remember if I replaced the PCV or not at the time, so doing that this weekend.
Also, Fastman TB and K&N FIPK kit on it too, if that matters. But they've been on since 50K with no problems. Filter could use a cleaning.
Been using a lot of Safeway gas (premium), so maybe all these factors could cause the code to get set?

Dealership says only Bosch sensors are available. Is he pulling my chain, or what?
As always,
TIA.
-Marq