Ecu compatability

Hi,

newbie to the forum looking for some advice regarding Ecu compatibility.
My B7 1.6 tdi estate is currently in the vw dealers needing a new Ecu.

Have been quoted £1500 for a new one but I am trying to source a replacement first.
Initially tried ecutesting but they informed me that my ecu was of a type they couldn’t repair.

I have found an ecu on eBay with the exact part number but from a caddy.
so long as the part number is correct will this be compatible with my car?
or compatible enough for the dealer to configure it to my car?

Thanks,

graeme.

My question would be how do you know the ebay ECU is a goodun.

If yours cannot be fixed why could the replacement.

I had exactly the same issue with my last Audi. For the princely sum of £11 I bought a supposedly working ECU (same year/spec etc) off ebay and it did not work.

The car was only worth less than £1000 so I scrapped it.

Have you also contacted the ECU Doctor ref repair.

the one on eBay is off an accident damaged caddy with pics of the damage.
I have already attempted to get it repaired with ecutesting.com and been informed it is not a type that can be fixed.
So I am willing to take a punt on it so long as someone with a bit of knowledge can confirm that so long as the part no is correct it can be installed in my car.