jmb614

Good stuff! Just received my extenders in the mail today, very quick shipping. Thanks, Bruce!

TTMotorsports

Thanks Jason.

This should help correct your issue. New o-rings went out today for you too brother!

draggbody

obviously an old thread, but why would anyone use a simulator and not just do this??

Crissus

I dont know if i'm right with my answer, but it could be possible that for a smog inspection, the OBD will show as "not ready" when coding out rear O2s with STAR.
I dont know how it will work when they are altered by the tune? Since it is written in this thread that a tuner can simulate a different reading for the ECU to fool it.

kponti

O2 sensors all read ready when coded that way via star. I did mine and just passed with ready a couple of weeks ago

draggbody

i dont have smog here... i dont care about smog issues, i only want my check engine light off...

jcjmw

Sorry for a silly question, what is the benefit of turning off the second set of O2s?

draggbody

check engine light

boshowen

Driving without the rear 02 sensors doesnt affect performance right? I just finished installing my long tube headers yesterday and im feeling sluggish off the line - I dont have time to do STAR or get extension wire and im taking the car to Canaan Motorsports this Sunday

havnt flashed the tune yet for the headers could that be why?

time.

Bumping this thread to see if anyone knows how I can extend my rear O2 sensor with a set of long tube headers. Seems like Bruce @ TTM is no longer a vendor here. Thanks.

boshowen

Hey im still looking too, i bought what i thought to be universal O2 sensor sensor wire harness extensions from Summit Racing

The plugs were different and im back to square 1

jmb614

Seems the ECU in my 06 is ultra sensitive to resistance changes with regard to the secondary O2 sensors. In my case, I needed to cut some wire off of the old O2 sensors, then using a new OEM secondary O2, splice in lengths of that wire on the O2 sensor side of the connection, VIA CAREFUL SOLDERING, to accomodate the long tube headers secondary O2 location. The 90* extenders help to move the sensor out of the flow of exhaust, to simuate a reduction in emissions. With my datalogger I can see that after warming up the engine, the lambda values for the rear sensors are generally lower than the primaries. Thus, the ECU sees enough of a difference to think there is a CAT before the secondaries.

I do have smogging to worry about. In order to pass, the secondary O2's have to be left ON in the custom tune, but disabled in STAR/DAS as Robert pointed out earlier.

Anyways, soldering in a splice of O2 harness wire, versus a mechanical connection, was necessary in my case. As was the 90* extenders; those can be purchased online if you look around, if Bruce isn't available that is. That guy has a lot of knowledge on this platform. A 20 minute phone call with him was like reading these forums for days.

GinDistiller

Is there a consensus on whether or not we can unplug and remove the rear o2s? I've already coded mine out in STAR, just finishing long tube install and would like to use one of the ports for my wideband, which means I only have one available bung...

Thought I'd ask before I get the car off the lift, I'm hoping I can just delete them entirely.

E55Greasemonkey

My understanding is they have to be at least plugged in, so the ECU won't set a fault for open circuit. You can zip tie them off to the side.

GinDistiller

Thanks, that was my backup plan, just hoping it would be a tidier install! I'm not sure how hot the internal heaters get them so I'll be sure to leave it somewhere safe..

E55Greasemonkey

Good idea.

wrenching

Do you know what might cause them to not code out properly? I've coded several other things in STAR, but when I open the menu for the rear o2s, it says "one setting may be incorrect" with ---- for all values. I can code them to diagnose aus, and the CEL goes away, but it always comes back after a few days.
edit: had to change both options for writing to ECU, appears to be fixed now.

5150///AMG

wait wdym by had to change both options. Which two are you referring to. Having the same issue on a s55

SICAMG

Make sure all codes are cleared and have the car running to reprogram or it will not take.

BigVic

No, you should not be feeling sluggist after LTH install. But you should have the rear O2s plugged in. I coded them out and used O2 spacers and the car was exactly the same.

BigVic

No, you should not be feeling sluggist after LTH install. But you should have the rear O2s plugged in. I coded them out and used O2 spacers and the car was exactly the same.

BMW Owner

i unplugged rear O2 sensors, i removed the option in my Autel, and I didn’t have any check engine light.
So if option is disabled, why do I need plugs connected?
as i understand ECU is not sending signal to that branch anymore. Please correct me if I am wrong.

austingtir

I also unplugged the 02 sensors. Im sure the leaving them in there thing is a myth for the E55. I have onboard wideband imo theres no difference. Its an emissions issue only.


On my 955 cayenne turbo I was also told to leave them in there and I did get a check light on the dash when I removed them completely.
The cayenne turbo also fueled at WOT exactly the same with and without them. But somehow their computer wants to see the signal even with secondary 02 delete. (end of the day all a secondary 02 delete reprogram is doing is stopping the CEL in the vast majority of cases). Next to nobody actually properly tunes out secondary 02's and secondary air injection which is why we have to live with the fuel refinery smell when we delete cats and secondary air.

So some cars you do some cars you dont. It may depend on the way its deleted in the software/hardware not sure.


End of the day its a nothing and other than passing inspection that light is fking meaningless.

wrenching

When unlocking the ECU, one instruction said
steuergerät entriegeln -> confirm (In English: ECU unlock for programming))
another mentioned
For me it was sitzung variantcodierung einshalten (FN_ProgrammierMode)

if I did the first, the programming wouldn't take. Once I did both, it took.

However, now I can't get my Evap/O2 Sensor/O2 Heater to come out of unready. Does anyone know how to make that happen?