I had an issue with my 1998 1.9 z3, a starting problem. it wouldn’t start at all after driving it. we thought it was an immobiliser issue because the starter motor and fuel pump wasn’t getting any feed/power to it, people in this forum said the EWS code on the ecu needs disabling therefore i did send it off for it disabling. when it got back to me, i put ecu back in and yes it started but i went out for an hour started it on and off to check if it was working and it was sound until i got back home and it didn’t start again. so im back to what it was doing previously. does anyone know what it can be.