Since no one else is answering, I'll give it a stab. The way I understand it, Bank 1 is the passenger side and Bank 2 is the driver's side on a forward facing engine. The codes you got are for Bank 1 Sensor 1(P0135) and Bank 2 Sensor 2(P0161). The codes are "heater short or open" and "heater circuit fault". So Bank 1 Sensor 1 is the passenger side sensor before the cat and the other sensor would be driver's side after the cat. You didn't say which engine you have, 5.0 or 4.0. Sensor 1 on both sides is the sensor that gives information to the computer to control air fuel mixture by controlling the fuel injectors pulse width. Sensor 2 is after cat and is a catalyst monitor.
I would check the wiring going to the sensors. I've seen sensor wiring heated up to where it was brittle and fall apart when you touch it. It seems funny that both sensors, on opposite sides and one forward the other after cat would go bad at the same time. The sensors could be bad, but again, I would check the wiring very closely. Do this when the engine is cold.
Wednesday, June 6th, 2007 AT 6:53 PM