I can confirm my O2's are more technologically advanced. They have 119k on them and run like brand new, despite shop people here telling me they are dead at 100k. Essentially, mine are lifetime parts.BTW, does anyone know why the later yr e46 O2 sensors are so much more expensive. What is it about their design that makes them cost so much more. I wonder if the ones used in the older e46 (like mine for $65) are somehow less technologically advanced or something. Or, it could be that just like text books in college, they need a "new" edition to sell more. Like, since the contract with the first set of O2 sensors was expired, so they can be sold as BOSCH, cheaper and sooner. Meanwhile, BMW can still make money on the purchase of new "BMW" O2 sensors, while the old exclusivity "contract" expires. They just tweak something minor in the newer model and get to sell it for so much more. This is all just a marketing POV, of course. Maybe there really is something which makes them expensive due to superior capabilities or materials.
You can keep your O2's until they disintegrate, much like I do with underwear. If they still leave you feeling campy, then why make the change.I can confirm my O2's are more technologically advanced. They have 119k on them and run like brand new, despite shop people here telling me they are dead at 100k. Essentially, mine are lifetime parts.