Aftermarket header-easy way to fix CEL?

[elsenorfon]

Now that I've put on headers that bypass the front cats I'm getting the CEL. It wasn't on before so it seems likely that it's the o2 sensors. I tried to be smart and figured it was a circuit that needed completing so I cut the 4 wires and connected the two white ones (left the gray and black ones disconnected).

This didn't work :) It seems there must be some way to manipulate these wires to send the proper signal to the PCM, any ideas from electrical engineers out there? I'm really not qualified to extend the wires and drill a bung past the 2nd set of cats for the o2 sensors to go. Not a bit.

Any thoughts are appreciated. Many thanks.

[Loren]

Now that I've put on headers that bypass the front cats I'm getting the CEL. It wasn't on before so it seems likely that it's the o2 sensors. I tried to be smart and figured it was a circuit that needed completing so I cut the 4 wires and connected the two white ones (left the gray and black ones disconnected).

This didn't work :) It seems there must be some way to manipulate these wires to send the proper signal to the PCM, any ideas from electrical engineers out there? I'm really not qualified to extend the wires and drill a bung past the 2nd set of cats for the o2 sensors to go. Not a bit.

Any thoughts are appreciated. Many thanks.

PCM is Porsche Communications Management (Navigation) - it has nothing to do with emissions and O2 sensors. So, you must mean DME?

If this a US car you can not remove the cats or one set of O2 sensors - the US DME programming won't allow the car to run with the fault(s).

You would need to re-program the DME and then the car would never pass any US smog test (that I am aware of).

[elsenorfon]

sorry my last car was american and had a PCM (powertrain control module) so yes I mean DME. lucky for me i dont have smog tests, so would this just be a softronic reprogramming or how would this be done?

thank you!

[Loren]

sorry my last car was american and had a PCM (powertrain control module) so yes I mean DME. lucky for me i dont have smog tests, so would this just be a softronic reprogramming or how would this be done?

thank you!

By a competent Porsche shop. None of the "canned" chip upgrades do this (that I am aware of) - you need special programming to ignore the after cat sensors.