BMW e30 e34 (88-91) Air Hose from Idle Control Valve OE Air Hose from Idle Control Valve Brand NEW part with full 1 year warranty. BMW part# 13 41 1 730 397, 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.