A V6 engine only has 1 convertor, but can have 4 O2 sensors. 2 upstream and 2 downstream. Do a little further research on line with your engine size etc. and you will get all the info you need.
SOURCE: p0141 code
bank 1 sensor 2 that means the side where cylinder #1 is the second sensor so it is by the cat or after
SOURCE: 2003 Ford Ranger/2.3 O2 sensor - How many and Where located ???
Engine Heated oxygen and catalyst monitor sensors—2.3L engine
SOURCE: O reading for O2 sensors on 98 Ranger XLT
Yes the 98 ranger has 3 02 sensors,they are located in the exhaust system under vehicle,2 of them
are in front of the cataletic converter and 1 behind it.I replaced mine ,reset the codes and the check
engine light still comes on?
SOURCE: 2003 Grand Prix service engine light on even after new catalytic
I wouldn't have gotten a cat. If the o2s are all replaced, then it could be an EGR valve
SOURCE: Code P0141. O2 Sensor heater circuit fault (Bank1,
It is probably the sensor before the cat. if it has a heater. The heater circuit going bad is a common problem, it does not affect the way the car runs after it warms up, it is an emission device to heat the O2 sensor up quicker than the hot exhaust gas would. It should be replaced because it will keep your check engine light on and you would not be able to pass an emission test.
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