Getting a code P0134 (O2 sensor) "Signal Inactive" on my wife's 2001 T&C with 3.8 V6. Replaced both upstream and downstream O2 sensors because of rodent (groundhog ) damage, ate the soy based wire covering, (along with three ignition wires ) and after clearing all of the codes I keep getting the P0134 signal inactive like the sensor is not getting power. I need to get under and check the connection(s) (anyone have multi-meter values?) but in web searching the P0134 fault code another brand vehicle video said it came down to a blown O2 sensor fuse. I haven't been able to check if the '01 T&C has an O2 sensor fuse, hoping someone here knows if I wasting time looking for one?

If no fuse then I need to check the connection to the wiring harness to the new O2 sensor as it may have damaged the wiring harness somewhere that is hidden away from the O2 sensor? Of course the upstream O2 sensor, the connection and the wiring is the most difficult to access. Thanks in Advance.

Mike

of all the time playing with 3rd and 4th generation minivans, i have never seen a fuse for the O2 sensors.
i did a quick scan of the FSM supplement on the wiring schematic[s] for the fuel system [2001 my] and could not find any indication of a fuse for the O2 sensors.
my best guess is that there is more damage yet to be uncovered.
as to the plug print out, the wires are thus : upstream plug : cavity 1, br/lg 1/1 heater control, cavity 2, br/wt auto shutdown relay output, cavity 3, br/dg sensor 1/1 ground, cavity 4, sensor 1/1 signal
downstream plug : cavity 1, bk/db ground, cavity 2, br/wt auto shutdown relay output, cavity 3, br/dg sensor 1/2 ground, cavity 4, sensor 1/2 signal.
in this supplement, P0134 is the code for the upstream sensor [bank 1, sensor 1] staying at center.
i have the flow chart i can copy to a PDF and send to you if you can get me an e-mail address.
it's the best i can do.

WOW, THANK YOU That's great information, greatly appreciated I think I can work with all of your info and get it sorted out If I need the PDF I'll let you know and send you my email by pm. Thanks again.

Mike

(a fuse would have been way too easy but who said life is supposed to be easy )

glad to help.
please let us know what you find.

Im going off of memory ,,and that isnt what it used to be .

BUT,
Best I remember I think the O2 sensors get heater voltage from the ASD relay

5 volt Sensor reference voltage comes directly from the PCM

Everything has a fuse, while there may not be one specific to the O2 sensors, the feed is fused somewhere, might even just be the fusible link. But I suspect if that were the issue you'd have more than just O2 sensor issues.

FSM with electrical diagram tells all . . .

The service manual I have available at the moment is not an official FSM but an old Haynes and it tells me nothing so I'm relying on here and the not so trusted internet at the moment. Sad.

So I put this project on hold for a lot of weeks and a few days ago got another new upstream O2 sensor and still the same fault code (P0134) "no signal" for the upstream sensor. I now need to check continuity of the 4 wires to and from the PCM/ECM to the O2 sensor connector. Not sure if this 2005 T&C diagram and pin numbers are correct for a 2001 Chrysler T&C in the image below but I'm hoping they are, If that rodent took out one of the wires somewhere else and away from the O2 sensor(s) I hope I can find it this time. Does anyone know if this illustration is correct for a 2001 Chrysler Town & Country Limited FWD 3.8 liter V6 ? Thanks in advance.

Mike

you need wiring diagram for the year you are working on.what code do you have?

No fuse that i remember.

But make sure you have the wiring diagram for the exact van you have. Year model and emission pkg

2001 Chrysler Town and Country, Limited,

3.8 liter V6

Front Wheel Drive

Also trailer towing with increased cooling and high output alternator, self-leveling suspension, every option except AWD. The dealer's manager ordered it for his parents and then they changed their minds. We bought it new in '01.

That silver T&C photo above is it, '01 Limited 3.8 liter V6.......it's still in great shape for a 20 year old snow belt vehicle eh?

Thanks guys,

Mike

Best Factory Service Manual available for the '01 T&C?

And where do I get it? Not a CD please I need paper so I can sit down and leaf and read through it and get the pages greasy, not the mouse or mouse pad.

Thanks

Here you go. Manual

the 4 wire O2 sensors [heated] are basically the same for all cars, in other words, the diagram posted with the 1-4 cavity chart will work if the colored wires are inserted in the proper orientation as [in this case] the original [model year] caravan plug.
i know this to be correct because i took a ford ???? year O2 sensor and inserted the four, same color scheme wires into my 99 3.3 plug that goes into the rear bank exhaust manifold.
i had this used bosch sensor on the shelf, needed one on my "bus", so i figured i would try it. nothing to lose, right ?
it's still on there working correctly after 20k something miles, and i get 26+mpg loaded or empty, around town or trip.
as long as your sensor cavities match your harness after you determine the order of your harness, it will work.
just my experience with my "bus". your results and mileage will be different. i will add, the mopar FSM's are usually VERY close, if not duplicated, between generations of models. in this case, 2001 through 2007. there "may" be slight differences, as with the newer years getting new or improved options, but by and large, you can use a ton of information from one model year manual to help repair or diagnose a different model year of "xx generation" whatever.

Saw that and buy it nows for three other complete sets (chassis, etc.,) but the quickest I could get any of them was 8-11 days out. I want to attack it again today so I'll just go with the info provided here and see what I can find. THANKS ALL FOR THE SUPPORT!!

Mike

THANKS moprax

I found a listing for all of the different brands of O2 sensor wire color code layouts which confirms your findings

I'll see if I can post it?

Mike

Started into it and "did I find the problem?" or is this just a tab that holds the connection together on the wiring harness side?? (see yellow lines)

I had a PIA time originally getting the old chewed wires upstream O2 sensor clip connector apart and at the time worried if I had damaged it. Did I break some kind of a pin (chassis wiring harness side) that might have been a ground or is that just a tab that keeps it together? I guess I could see if it goes to ground on both side duh? IMO it seems that it would have to be a pin otherwise the O2 sensor side wouldn't have a matching female pin......just thinking while typing


Just looked at the indexing tabs on both connectors and those two areas wouldn't match up.............am I seeing this correctly?

Just looked at the indexing tabs on both connectors and those two areas wouldn't match up.............am I seeing this correctly?

Body side when connected would be on the top and O2 sensor side on the bottom........darn I was hoping that was it.......back to under the van.