I had this code in my 97 m3 years.ago.
It was a crack in a evaporative pressure tank.
I could clear the code and it would return after a tank or so of gas was used.

This problem has nothing to do with electrical connections it has to do with fuel vapor pressure leaking. First thing would be to insure gas cap had a good.gasket seal.

Anything happen that might have disturbed something related to vapor pressure. A disturbed fuel pump gasket?