I now it's too late know but you really should replace like for like with correct code not mix and match. I think ZBG might be typing error as I cannot see such gearbox code. Fault code 18156 just says that control unit is defective and needs to be replaced, 17090 is for F125 switch, it could be switch, wiring or control unit issue. I do not have any details about pinouts but they could be different between different transmission control units. Also engine uses different generations of ECU between PF and FL, I think it was Motronic 5 for PF and Motronic 7 for FL so it's possible that TCU and ECU will not communicate correctly.
__________________
Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
|