1997 BMW 540i BodyCode: E39; For Exterior Temp Display On Hvac;. Part Type: Ambient Air Temperature Sensor. 1998 BMW 540i BodyCode: E39; For Exterior Temp Display On Hvac;. Ambient Air Temp Sensor. 1999 BMW 540i BodyCode: E39; For Exterior Temp Display On Hvac;.
