Firstly - make sure you have the right sensors. I purchased a complete set from Rock Auto - Part Numbers 23158, 23018, 23159 & 23160.

The P0031 and P0037 are actually the front cat
http://www.obd-codes.com/p0031
P0031 HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
P0051 HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
P0057 HO2S Heater Control Circuit Low (Bank 2 Sensor 2)

Personally I would be replacing them all....

 

The problem is that the aftermarket sensors have incorrect resistance leads that the PCM misreads and throws the codes. You will need to buy the Mopar sensors only. Just found this from a factory tech. You can replace the PCM and sensors from Autozone over and over, but it is the leads themselves.

 

I replaced the rear circuit to see if it would take away codes P0051 and P0057, and it did not. The downpipe that has the 2 cats in it is not original, in fact it looks fairly new, and the Jeep runs great, so I don't think it's a cat issue.

 

Off the web site i quoted

"check for 12 volts at the heater circuit feed (hint: unplug the sensor and check at the wiring connector to do this measurement)
check the ground circuit for continuity
measure the resistance of the heater circuit (done on the sensor itself)
measure the resistance and voltage of the wiring
Refer to a service manual for the correct specifications (volts, ohms) for your vehicle. On some Toyota vehicles this code is triggered when the resistance of the heater circuit is below 0.8 A.

With that said, a common fix for this DTC is to replace the air/fuel (O2 oxygen) sensor #1 on bank 1."

 

Bump - Any feedback from others who had this same problem?

 

I wound up replacing the ECM. I was lucky enough to find one in a wrecking yard. If you have SKIM you will most likely have to go to the dealer to get it (ECM) re-flashed.

 

Thanks for the info. This is the first I've heard of SKIM, what is that?

 

SKIM (Sentry Key Immobilizer Module) Its the factory security system. If you have a gray key you most likely have it.

 

Still working on this, trying to get out of replacing the computer without tracking down the root cause.

Does anyone have a link on how to test the wiring of the O2 sensors?

 

http://www.naxja.org/forum/showthread.php?t=1012701
http://www.wranglerforum.com/f5/02-sensor-help-quick-91516.html

 

Update:

New computer did not fix the problem. In my troubleshooting I've found out that if I unplug each oxygen sensor, the low voltage code goes away. If left running with them unplugged, the normal (p0132) O2 code will trigger. Does that help anyone troubleshoot??

Please help, the Jeep runs good, but not being able to fix this light is killing me.

 

did you ever fix this problem? i just threw all these codes also and cant fix it!

 

ok after having this same problem, dealer wanted to replace pcm. they replaced pcm with a new one, jeep was fine for first three start ups. now the problem is back. has anyone fixed or dealt with this problem?

 

A common cause of this code in a wheelin Jeep is water getting in the sensor connector and blowing the heated sensor fuse. Check the fuses for the sensors.

 

I thought of that but for the life of me I can not find a fuse for the sensors.

 

i got all mopar sensors still hav the problem.

 

Bump, i have exact same issue with mine. Just Had it towed to the dealer monday. They say it is the pcm... So now i am waiting who knows how long for the new pcm. I understand that they may not have a pcm available for a couple months! Any other ideas?

 

R u throwing any other codes at all? Like I said I waited for a month for back order PCM and it didn't fix the problem. My jeep runs and drives like normal tho.

 

I would be checking the common ground for all four O2 sensors heating circuit G105.

the ground is located rear of engine RH side

 

It threw the four codes mentioned and also p0421 bank one sensor one also had a misfire code on cylinder 2. Once the pcm enters "open" mode the car will idle fine except about every 30 seconds or so it is almost as if the computer decides to stop sending spark...thus an almost stall of the engine..and then the computer realizes it messed up and recovers to run until 30 seconds later and it repeats. It keeps throwing the four codes when it about stalls. I've tried holding the gas pedel around 3k and when it happens the rpms drop and does recover to the 3k it was initially at..eventhough pedal is constant.

 

I would be checking the common ground for all four O2 sensors heating circuit G105.

the ground is located rear of engine RH side

Good suggestion, i will check that when i get a chance to get out to the dealer.

 

Got out to the dealer this morning and removed and cleaned/wire brushed the ground wire harness attached to the block on the passenger side. There were a bunch of small guage black wires connected to this, so i assumed it is the ground for the majority of the sensors in the area. Once i reconnected, i cleared the adaptive memory by following the steps somewhere on this forum. Initially all was good but after driving it for a while around the block, everything went back to the way it was. The computer only threw the codes 0032 0038 0052 and 0058 tis time...no more of the p00421 nor cylinder2 misfire.

 

that may have been the wrong ground. the correct one is on the firewall just behind the engine on the right. according to the FSM that is the ground for all four O2 heater circuit. you should see a wrapped cable with a lug connected to the wall with a bolt

 

Yea I did same thing last night to mine same Cleese popped right back up when I reconnected batt

 

A guy on the jk forumwas getting the same codes and had his pcm replaced 4 or 5 times and finally it fixed it. So it may be that chrysler just produced a bunch of bad pcms. Here is the link...http://www.jk-forum.com/showthread.php?48019-O2-Sensor-Ground-Fault-Code/page3

 

There were three grounds that i saw. The one on the passenger side of the engine block, one on the passenger side firewall just above the engine block(this one only had one thick gauge ground wire) and there was one on the drivers side just above the engine block on the firewall. The one on the drivers side had a ground strap going to the engine block, a ground strap going to the hood and also connected to it was one wire entering the wiring harness that runs from the cabin to the pcm.

 

, one on the passenger side firewall just above the engine block(this one only had one thick gauge ground wire) .

yes, thats the one to check. it is ground # G105 in the FSM

 

When I get code 51 I replaced the upstream O2 sensor because my Jeep was running rich. The code went away after disco'ing the battery cable.