O2 sensor heater could be shot in the sensor. But not throwing that code because the relays working?
And lambda isn't the same, o2 sensor is 1221 i'm pretty sure.
91 318is - M50NV (gone)
02 WRB Subaru WRX EJ207 forged, 320 AWHP stock turbo.
85 - 325
02 325i Sedan