Now the code to check the immobilizer is in the flash, what if the ecu/car wasn't equipped with immo-say a north american ecu with a euro flash. Can you just flash an immo-defeated 95040 bin on there, or is there something more substantial?

As always, thanks guys.

I understand disabling the immo, what I'm asking is whether the fact that the original car/ecu never had an immobilizer will change the process.

Say I flash a euro file on a 2000 a6. The 2000 a6 (NA) didn't have an immobilizer. So the data on the 95040 isn't relevant to deleting it. Would you just flash a immo off bin to the 95040, or doesn't it matter as the flash is referencing something that isn't there. There is no immobilizer data stored on the eeprom, would the car start? My thinking is no, but I'd like a definitive answer.

Sorry if I'm making a mountain out of a mole hill here.

So I did a bit of testing, and as suspected flashing an immo file onto a non immo ecu resulted in a no-connect issue, and an "engine start blocked by immobilizer" DTC. That was with a blank (non immo) 95040. I flashed an immo defeated bin to the 95040, and everything works as intended.

Why I cared-well, euro s8s were available with manual transmissions. NA cars were not. You can't simply recode a NA ecu (soft coding) to a manual as it won't accept it, and just flashing a euro bin results in immobilizer difficulties. So to confirm, you can flash a NA ecu with a euro bin as long as you also flash a 95040 bin with the immobilizer defeated.

It's my understanding that the cluster has to match the ecu IF the immobilizer is active. If not, you can use a non-immo cluster in an immo car as long as the it has been disabled in the 95040. If the ecu is defeated, the car will start, but if the cluster and key don't match you'll be stuck with a blinking KEY icon on the dash (same happens if you use an immo cluster in an earlier car). What has me curious is the possibility of retrofitting IMMO into a non IMMO car (I read you were interested in that as well nyet). I have vag-tacho/k+commander as well as several clusters (both immo, and non immo). I can dump the cluster and match the skc to an ecu and then adapt a key (my c5 keys have the RFID chip in them, but I haven't pulled off the column surround to ensure the pickup ring is present, although I suspect that it is) and see if I can get the immobilizer to work. If it works with the immobilizer cluster, I'll see if there's any chance of putting an immo cluster dump into a non immo cluster and getting it to function.

Suggestions? I'll ad all this to the immo writeup when I finish.

I can post a immo-off 95040 bin if you like, use argdubs tool to write it to the ecu in boot mode, that will allow the car to start and run with the rs4 (k-box?) bin, or if you have the oem ecu (you said your car originally had an immobilizer) you can copy the 95040 contents onto the t-box. Assuming you also have the original cluster with immo, and an adapted key, that will enable the immobilizer functions in the t-box running the rs4 bin.

Yes, vag-commander k+can can read/write to the cluster, but I haven't tried flashing a non-immo cluster with an immo-cluster bin yet. It is on the list of things to do!

k+can up to version 2.5 doesn't require a proprietary interface-it'll work with any KKL-cable. I attached my copy to the post. If you can't get it working, I also included the EPT (contains the cable settings and serial number) off of my cable, as well as m-prog (used to write the ept to the cable).

I (today) successfully put Immo2 on my 2000 a6 (didn't come stock with immo). The oem keys already had rfid chips, the reader was on the ignition barrel. The only part required was an immo-equipped instrument cluster. I just wrote a 95040 bin I snagged off the forum, changed the SKC to what I wanted it to be, corrected the checksums and put it on the ecu. I used an 01 a6 bin to test it (4b0907551aa). It would start then die with a flashing immobilizer icon until I adapted the keys using vcds and the SKC, but now all is well.  The immobilizer box is contained inside the immo2 clusters, (whereas immo3 uses a separate box) and is not present clusters from cars that didn't come equipped with the immobilizer. There are hardware differences (at least between the 00 a6 with no immo, and the 01 that had it) preventing you from just flashing the non-immo cluster with the immo-cluster bin.

I have pictures of the RFID chip in the key (you take the key apart by removing the audi emblem on the back, there is a small philips screw underneath it). I have an immobilizer write up done, just haven't figured out whether to post it here, or on the s4wiki. Waiting for nyet to get back to me.

Excellent, thanks. Hopefully I'll get it going without any issues...

Cool bananas!

Doh! Do you perhaps have details of the h/w differences?