Hi, I still have a Lambda sensor (LMM) for a VW Golf 3 lying around. I replaced it in my own car once, but it didn't make any difference regarding the lack of power I was experiencing.
So, I guess the old one is still okay.
For something like 60 euros, you can have it.
To give you some peace of mind, we can do this like this: I'll send it to you, you try it out, and if you like it, you pay me; otherwise, you send it back.
I think this is fair. Please email me if you need anything.
[email protected]
By the way, the parts cost €170 at ATU.