BMW G20 318d ECU fault replace or repair?

[bmw2020M4fan]

Hi all,

My G20 318d (B47D20B) has recently started having some ECU-related problems. I'm trying to decide whether to have the original ECU repaired, look for a replacement or contact the dealer.

While searching for a used replacement, I came across this one listed for just £189.99

mtautoparts.com/partpage/1562-311024-130310030/bmw-3-series-ecu-engine-b47d20b-318d-g20-g21-9888494

Has anyone here replaced the ECU on a G20 318d before? Does a used ECU need to be coded/programmed to the car, and are there any particular numbers I should match before buying one?

Any advice would be appreciated. I have searched for an original new part, and prices are crazy.

Thanks

[Jakg]

Are you really, really sure you need a new ECU?