Reprogramming ECU to turn off O2 Sensors

[Kenny Boxster]

97-99 or 00-04? You don't have to reflash ECU when you delete cats. You can tune an ECU to make more power, however many people including myself are content with just the increase from removal. Are you getting a check engine light? You can flash it or just add some 02 sensor extensions to remedy the problem.

Edit: It looks like your car falls in the 97-99 range judging from you car pics. You would probably be throwing a check engine light then.

[truegearhead]

Originally Posted by Kenny Boxster

97-99 or 00-04? You don't have to reflash ECU when you delete cats. You can tune an ECU to make more power, however many people including myself are content with just the increase from removal. Are you getting a check engine light? You can flash it or just add some 02 sensor extensions to remedy the problem.

Edit: It looks like your car falls in the 97-99 range judging from you car pics. You would probably be throwing a check engine light then.

I have a pretty strange problem. I removed the cats and the car ran fine. Then after making a different repair I unhooked the battery and reconnected it and the car started misfiring on all 6 cylinders. Both Porsche shops I've taken it to have told me that the problem is the removed cats and that I have to do something with the rear o2 sensors. And yes the check engine light is on.

[Eric523]

Originally Posted by truegearhead

Then after making a different repair I unhooked the battery and reconnected it and the car started misfiring on 6

What was the other repair?

[truegearhead]

Thanks so much for your help.

Full story
1) Car refused to start, just clicked. The battery was old so I just went ahead and replaced it (never jump started the car)

2)with the new battery it started but misfired on bank 1

3) I towed the car in and they told me the AOS and oil fill tube failed so I replaced them

4) I got the car back and it didnt red line and still ran rough. They told me the variocam was bad and I had a bad cat.

5) I replaced the cats with test pipes and it ran great but wouldn't redline

6) I replaced the variocam and the car ran but wouldn't redline. I tried disconnecting the battery to reset the ecu and ended back at step 2). Except I now have a misfire on all cylinders. By the way steps 1-6 are over 3-4 weeks, only 1 week spent out of the shop.