o2 sensor help: NYS Inspection time

[black95]

okay a little info. when i bought the truck form day one it has had a P0161 Heated sensor circuit malfunction ( bank 2, sensor 2)trouble code. before i purchased a new sensor i went under the truck and probed the harness for power. i had 11.5 volts on the pink wire and i had ground.ordered the sensor which is bosch (not cheap shit). installed the sensor and now it is throwing both a P0161 and P0141(heated sensor circuit malfunction Bank 1, Sensor 2) code. it never threw the P0141 code before ever. cleared it a week ago and light stayed off for 187 miles. recleared it yesterday and it only stayed off for 53 miles. it is throwing the P0141 and P0161 code

 

[fyremanpat]

sounds like there is a damaged wire somewhere. trace it up as far as you can. possibly melted somewhere causing a short....check fuses as well

 

[black95]

just check all fuses and why all of a sudden it throws the other code

 

[SunlitComet]

I recall there being diffrent part numbers from front to back pehaps you have the wrong one?

 

[black95]

no it is for the back the front has a flat four wire plug and the back has a square four wire plug

 

[fyremanpat]

Did you check for damaged wires?... you could have two bad o2 sensors out of the box

 

[bowtiefreak]

do you have a way to clear the code? I would do that and see if it comes back. Both my rear O2 sensors had a heater issue, I replaced one and have not had a code since

 

[black95]

no i havent checked for damaged wires yet i figured i cleard that when i had 11.5 volts and ground at the plug, but i will test them again tomorrow.

i have a way to clear the code.i have cleared it three timesbut to no avail it comes back, i did only replace the one maybe i should just replace the other

thank you i will play with it more tomorrow

 

[BluHoe96]

Do we have two rear sensors? I was under the impression that there was only one rear right between the muffler and the midpipe flange? If there are two, maybe you should try switching the two and see what code comes up?

I also vote for tracing the wire. I know you said you had voltage at the time you checked, but there could be a section of the wire that may have melted from the heat of the exhaust, or engine and causing an intermittent connection that's throwing your code.

 

[bowtiefreak]

we have four sensors, two before the cats, two after the cats