I’ve had three late model (2005 or newer) vehicles that have had PO2 O2 Sensor Problems that kept recurring. It is because of the ethanol content in gas. I finally bought a CAN2 OBD diagnose/reset tool to deal with. Just reset it every time it happens.
I've never had the slightest problem with ethanol containing fuel, and I tend to drive my cars 'til the wheels fall off. Honda Civic, Toyota Corolla, Acura Integra (Honda again), and Ford Ranger (which I think is still made by Mazda) are our latest ones. I put 200K on the Ranger, 175K on the Acura, and my wife's Toyota is getting up to 100K pretty quickly (she has a rather long commute). My Civic is pretty new and my commute is rather short, so not many miles on that yet.