BMW e23 e24 e28 e30 On Board Computer OBC Relay NEW On Board Computer Relay Brand NEW part with full 1 year warranty. BMW part# 65 81 1 373 726, note the mid-year splits. Genuine BMW part, recently made: not been lying around. PLEASE NOTE the mid-year split on PRODUCTION date. See Models Chart BELOW. Not sure about your car? email us your VIN to confirm.