I have a trouble code: P0141 and it's suppose to be connected to the rear O2 sensor. I changed the O2 sensor, and I still get the code after clearing it. So the other reason the code might be showing up is if there is a short in the 02 sensor wiring.
I'm trying to find a wiring diagram for it, and I can see the one above, however, I'm not THAT good at being able to understand the diagram. Someday perhaps. That particular one doesn't look very informative to me.
Fault 141 is a heater circuit malfunction Make sure your checking the correct sensor. this fault code is for the rear sensor If you have a California emissions vehicle then it will be the RH (pass. side) rear sensor. If you have a federal emissions vehicle then it will be just the rear sensor. I would locate the correct sensor and using an Ohm meter check the resistance of the heater circuit. If your vehicle only has 2 O2 sensors then the diagram above is for your set up if your have 4 o2 sensors then you will need a different diagram. Let me know if you need the other diagram. if your using the one above then disconnect the O2 sensor and check the sensor using your meter set to read Ohm. test the wires which correspond to pins 1 (Light green/black) and pin 3 (Black/red) wires you should see between 7-40 Ohms if not replace the sensor.
I'm not sure I understand the California emissions vehicle or Federal emissions vehicle thing. I assume that it's Federal because I don't live in California. I've looked everywhere along the exhaust pipes to find another O2 sensor, but with no luck. The one I found was located right after the Y for the V6, and before the muffler. Where would the other one(s) be located? I really wish there was a repair manual for this vehicle!!
I just went out to test the sensor. I'm not going to give myself any excuse. I changed the wrong sensor. I would have changed sensor 1 when I needed to have changed sensor 2. Sensor 2 was pretty out in the open, so I don't know why I missed it! Thanks anyway for your help!! BTW, both new and good sensors tested at 16 ohms. Bad sensor tested at 0. Thank goodness there's no short!!!