Anyone know the final stage of O2 sensor falure before vechicle is rendered complete usless untill repaired? I apparently need mine replaced and they supposedly have little heaters in them which makes oem 02's a whopping $250 a peice (in canada). I have no idea how to diagnose this and I don't want to pay someone to fix it. I did get a code that suggests near total failure on 1. They need to be replaced in pairs and aftermarket O2's don't have the heater nor a decent wire harness. Want oem but want to eat too!
