2003 Cobra Revert Firmware to turn off rear O2 Sensors?

[da28fan]

Man, I'm going through O2 sensors like toilet paper. I've checked and there are no leaks. I've reseated the ECU also. I bought Bosch sensors and they lasted about 2 weeks. Going back to Ford OEM next. BUT, I want to replace the front sensors and turn off the back, but the firmware update took away the possibility of turning off the back sensors. Is it possible to revert back to the prior firmware to gain back this capability? O2 sensors are a little too expensive to keep dealing with this. Thank you.

U7142
#144550
2003 Cobra
v.7r12d (w 9r02 update)

[sohfast94]

First I'm concerned on why this is happening. Could you explain?
Yes you can revert back and then turn the rear O2s off.

[da28fan]

Yes I too am concerned. At first I believe it was because the leaks in the newly-installed Bassani X-Pipe and cat-back were spot-welded and messed them up and so I bought four new ones, all Bosch and all the same sensor. Then I've heard that you should not use Bosch and stick with Ford OEM, so that's what I'm planning to do unless I learn something different here on the board. I'm just so tired of this... I've checked the wires around the X-pipe and there are no melted wires. I've plugges the exhaust and checked for leaks and don't see them either.

[sohfast94]

Is this thing custom tune or is this just the canned tune?

[da28fan]

Is this thing custom tune or is this just the canned tune?

I'm using the 91 octane performance tune. Thanks.

[sohfast94]

If all you have is this x-pipe then you shouldn't be going through O2 sensors....Nothing in the tunes should be causing this I checked through all the 03-04 cobra ones for 91 octane.