My 2008 Sahara, got a check engine light. A friend and also a former Chrysler tech used his mechanics emission unit and found the lower oxygen sensor on the drivers side was detective. He replaced it and reset the code. All was fine until I drove about 3 miles, code came back. I went back and now the other side was popping the same code. Changed the sensor, with a new one..... still same code. Changed the second sensor with another. Code still showing and check engine light came on. Made appointment with dealership.

Does anyone know what may have caused this? Or did this happen to anyone.

Funny thing he been working for NYC Police as a mechanic and a Dodge Charger came in and had the same problem.

 

Maybe a good sensor but a bad catalytic

 

I was told that the computer may have to be flashed.

I just came out of warranty. I have life time power train warranty but sensors are not covered.

 

I would say bingo. The O2 sensor behind the cat, monitors the action of the cat. The one in front of the cat is used to adjust the air fuel ratio and it will usually set a code if you have an air leak somewhere in the system after the air filter and before the TB, sometimes it will set one if you have a vacuum leak in the plumming at the intake manifold. Low fuel pressure can also cause it to set a code when it makes the system get lean.

 

What's the code you are getting?

 

If you know anybody that is a ford tech he can hookup what we call ids to your jeep and really see what it is doing and then you won't have to guess. Originally it would only talk to ford products but now ford has given us a generic mode so we can check out other vehicles also.

 

This sensors are on the exhaust manifold. There are four, two on each side p1 is passanger side (plug 1 side) p2 is is on the drivers side (plug 2)...theres an upper and lower. the lower is the one that can not reset

 

bank 2 sensor 2 of O2 heater

 

code is

p0058 bank 2 sensor 2circuit high........

actuated heater circuit, 12volts at pin 1 from computer and ground to pin 2

changed sensor twice

 

The sensor itself isn't the only possible cause.
Were any resistance readings of the O2 sensor, or the wiring harness taken?
Was the heater circuit tested with a light for illumination commensurate with duty cycle?
This is the troubleshooting chart:

P0058-O2 SENSOR 2/2 HEATER CIRCUIT HIGH

• When Monitored: Continuously during O2 heater operation with battery voltage between 10.4 and 15.75 volts.

• Set Condition: The PCM detects that the O2 sensor heater element input is above the maximum acceptable voltage. One trip fault. Three good trips to turn off the MIL.

[TABLE]
[TR]
[TD="bgcolor: white, align: center"]Possible Causes
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]O2 2/2 HEATER CONTROL CIRCUIT OPEN
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]O2 2/2 HEATER GROUND CIRCUIT OPEN
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]O2 2/2 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]2/2 O2 SENSOR
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]POWERTRAIN CONTROL MODULE (PCM)
[/TD]
[/TR]
[/TABLE]