CHIP? 02 sensor issues. Anyone ever ran across this?

[mn box s]

I replaced my entire exhaust with S.S. duloboz and fabspeed. I need to get some software to get the car running correctly. Im throwing codes because my fabspeed test pipe 86ed my rear o2 sensors so now Im running two instead of four 02s I bought four new and installed only two due to the fact that there were only two bungs (on headers.) Obviously Im throwing CEL codes for o2. I should be able to get away running the front two only because they are (i believe) the ones that read the air/fuel mix? Im thinking of welding in two new bungs but I dont really want to. Also if I was to do that Id need some o2 extention wires I heard that mustang ones work??? What I really want to know is if a software upgrade (chip) you could program the two rears out? Please help, thank you! thank you!

[dcporsche99]

Sorry to hear about your O2 sensor issue. I think this was discussed somewhere before. However, I haven't heard of a software upgrade deleting the downpipe 02 sensors.

Hmmm,....I'm interested to know what others think about it.

In the meantime, perhaps you should try doing a search.

Keep us posted!

[mn box s]

Well you might have read a similar post from my self a year ago. I got pretty lazy the past year and the car runs quite well considering except at idle and fast high speed shifts there is a lag I guess I shift too fast (pause in power band). I didnt get to much help last year I found a local porsche performance shop that said they might beable to do something but I was looking for a back up answer first. So if anyone can help thanky thank you.

[edevlin]

I had similar issues chaseing error codes when I went to headers and high flow cats. Ended up replacing both cats and lots of sensors. Take care if extending the wires for the cats, as they appear to be sensitive to resistance of wire and how they are connected.

My car is also chipped and I asked the folks who wrote the chip about changing the threshold level that was triggering the sensors CEL. I think he said mechanics could get in a lot of trouble attempting that, as you are messing with what constitutes legal emissions levels. I think my exhaust was fussy to dial in because the TTP headers did not come with any bungs (you can see a photo at my Boxster site link below my signature).

When adding bungs on a modified exhaust seems it seems like care must be taken on bung placement both how far along the exhaust stream and height of sensor tip in the exhaust stream. And as I said above how the wire for the rear sensor is extended. It funny, some folks seem to have no problem when they try the procedure, other unfortunate souls like me end messing around with it quite a bit, it was 6 months before I got it right. On the up side, it sure makes me appreciate that the car is now running great and no CEL's.....

Ed

:dance:

[shaman1204]

Check out this thread:

wtf!!!!!!!!!!

SRQBoxster could probably chime in here, he deleted two o2 sensors when he installed headers and then re-flashed the ECU to Euro specs that only look for two sensors. I guess the problem would be finding a place that could or would do that for you.

[Tool Pants]

You need the sensor before the cat. The sensor after the cat is because of the EPA. By having a sensor before AND after the cat the cat efficiency can be determined, thanks to the EPA. This is why ROW 986s do not have as many sensors as US/Canada cars.

There are oxygen sensor simulators you can buy.

The other thing you might try is to leave the sensor after the cat still connected to the electrical connector, but the sensor is not screwed into the exhaust as you do not have a bung, and just leave the sensor hanging in air.

I tried this on my 2.5. I did get fault codes when I checked with a PST2, but the check engine light did not come on.

[porsche986spyder]

Originally Posted by shaman1204

Check out this thread:

wtf!!!!!!!!!!

SRQBoxster could probably chime in here, he deleted two o2 sensors when he installed headers and then re-flashed the ECU to Euro specs that only look for two sensors. I guess the problem would be finding a place that could or would do that for you.

I remember asking about this too. It seems like all the guy did that re programed his ECU was set him up with the early 97-99, 2.5Ltr spec setting which only has 2 cats instead of 4, but by doing that, you really are not utilizing the 00-04, 2.7Ltr engine. Seems like the wrong way to reprogram the ECU just to keep your cells from coming on.