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jeepguy2004 02-17-2013 07:03 AM

o2 sensor help
I own an 04 grand cherokee with the 4.0 motor.

I have two codes coming up with P0135 Generic o2 heater circuit (Bank 1, Sensor 1)

Also (Bank 2, Sensor 1)

I am trying to order o2 sensors, but not sure if they are down stream, upstream, right, left, etc..

If i could get some help on this it would be great!!


Frango100 02-17-2013 09:08 AM

Re: o2 sensor help
1 Attachment(s)
The upper sensors, closest to the engine manifold are the 1 sensors, the downstream sensors are the 2 sensors.
The forward manifold is bank 1, so the aft manifold is bank 2.
So bank 1 sensor 1 is the forward manifold upper sensor and bank 2 sensor 1 is the aft manifold upper sensor. See also attached picture.
Also the OEM sensors are from Denso. Eventhough Bosch sensors are good, they heat up more slowly then the Denso sensors and could throw you a fault code again.
Oh, and check the heater fuse first before ordering, fuse 16 (15Amp) in the power distribution center.

jeepguy2004 02-24-2013 06:39 AM

Thanks!! Appreciate the help. I ordered sensors I need. 08-05-2013 07:16 PM

Re: o2 sensor help
I am hoping that you will see this thread. I replaced all of my O2 sensors with Bosch because I didn't know any better before reading this post and my jeep is again showing the same fault code for the bank 1 sensor 1. I have reset the ECM three times. How do I get rid of this code if the sensor is heating up to slow? I could really use some advice.

Frango100 08-05-2013 09:51 PM

Re: o2 sensor help
There are guys who use the Bosch sensors without any issues, but they could heat too slowly for the jeep PCM and then a fault code is set. If this is the problem, then only replacing with the Denso sensors will help. But ofcourse the problem could be something else. Did you check the fuses for the O2 heaters? The problem could also be with the wiring. 08-05-2013 10:41 PM

Re: o2 sensor help
I did check the fuses and everything is ok. I also checked all of the wiring and there were no red flags. I made it 10 miles the last time and it came back on. I am at a loss now.

Frango100 08-05-2013 11:47 PM

Re: o2 sensor help
You could swap both upstream sensors and see if the fault follows. Could be a problem with one of the new sensors. 08-06-2013 09:32 AM

Re: o2 sensor help
I already replaced the sensor again.

Frango100 08-06-2013 12:02 PM

Re: o2 sensor help
And that solved the problem? 08-07-2013 10:21 PM

Re: o2 sensor help
No, it is still giving the same code.

Frango100 08-07-2013 10:51 PM

Re: o2 sensor help
Still Bosch sensors?

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