So a buddies 99 ranger 4.0l threw up a code for a o2 sensor. I scanned it and it said PO141 o2 sensor bank1 sensor 2. I am guessing that because it has one sensor in each manifold pipe and one behind the second cat that it is refering to the rear one. Am i correct in this asumption. Thanks, Bill

 

P0141 says that there is a problem with the heater circuit in the rear oxygen sensor. First thing to check is for damage to the wires and connector. The rear sensor lives in a friendlier environment than the front sensors do, so it rarely fails - but anything's possible.