Hey all. Yesterday I got a check engine light, and the code was for Short Term Fuel Trim Too Rich. Naturally, I suspected the O2 sensors. Apparently, BOTH of the Bank 1 and Bank 2 Sensor 2s are dead. What I want to ask is this: Are the Bank 1 and Bank 2 sensor 2s on ONE side of the exhaust, meaning, the pre and after catalytic sensors, or are these both the after cat sensors from both sides?

I suspect they are the after cat sensors from both sides, and if that's the case, what could cause both of them to suddenly stop working? I could understand one of them, sure. And I could understand two sensors, if they were the pre and after cat sensors on one side, which would likely indicate a bad catalytic converter--but BOTH after cat sensors from both sides? What could have caused that?

I'd appreciate any help at all. THANKS!!!