Long story short, the Audi money pit needs to be fed more time and money.

Using BDM100 ..what donor ECU can I use to accomplish cloning the factory ECU onto a donor ECU?

The stock ECU has part number 4L910560C and says MED9.1.1
Also the number 0261S02204

Can I use any MED9.1.1 ECU from any Audi?

What about MED9.1?

Can it be from another Audi 4.2, like say a 2007 A8 4.2L?

Can I go even further and use one from an Audi Q7 3.0?

Does the part number 4L910560C HAVE to match?

Does the number at the bottom "0261S02204" HAVE to match in full? Or a partial match?

I'm about to attempt this with a BDM100 setup, a borrowed laptop, and patience.

I need help guys. Lol.

This car has been a bag of issues from day one, but I keep feeding the beast lol. It's my girlfriend's car.

Any help would be appreciated, as she is using her son's car while I figured this out.

Thanks!

BTW I already opened the stock ECU.

Keeps popping S13 fuse. Already verified the harness from ECU to the driver's side HPFP fuel regulating valve. Keeps killing HPFPs. Just replaced it for the 3rd time. Suspected burnt ground circuit inside ECU. No continuity from pin T60/60(?) to any other pins on ECU. Pass side HPFP ground on pin T60/35(?) has continuity to many other pins on ECU on the bench.

Drivers side HPFP pin on ECU has no continuity the any other pins on ECU.

Pass side HPFP pin on ECU has continuity to many other pins on ECU.

So something isn't right lol

For a long time I just thought it was a short in the harness, but checked the harness many many many times over the 3 yrs we have had it, and never found anything that indicates it's not the ECU.

At my wit's end with this thing lmao.


At $230/pop these HPFPs are getting expensive to replace.

From day one it always has had "circuit low" DTCs for everything on fuse S13. Thinking whatever is supplying the switched ground to those circuits burnt out?

BTW thanks for the reply.

But does it have to be a MED9.1.1?

Or MED9.1 works too?

I read some other threads asking the same, but wasn't entirely clear on whether or not it's a yes. ?

Hey so I got the donor ECU in..will this work?

This is the label on the factory ECU:

If it boots you will probably lose automatic starter capability, as the hardware is missing from the board on B7 chassis. This means it won't turn the starter.

You must get the exact same hardware bosch number, not a random control unit. There are significant differences between them. At the very least it has to be from C6 or D3 and not from B7.

The Bosch hardware # I'd the number at the bottom left. Or ?

Well shit lol.

Ok thanks for the replies my man

Back it goes lol.

OK so...will this ECU work?

I noticed the ECU that is on the car doesn't have anything where they usually have a "HW: H16" etc...

What does that mean that the original one doesnt?

All the other ECUs I have seen while searching for a replacement will have that HW: H(insert number here) on the right side of the label.

Thanks again guys.

BTW still waiting for my BDM100 to come in..

I did get the rig that you mount the ECU in in order to hold the circuit board with the pogo pins pressed tight onto the pins on the ECU while reading/writing ..

Extractor screws haven't come in yet either...