2000 V70 SE B5244S non-turbo Denso AW-55 304K miles

Yesterday the ambient temperature digital readout no longer displays the outside air temperature. Instead, on the dashboard DIM it now reads " - - - - ". All of the other DIM selections work OK.

Haven't investigated yet, but I know the ambient temp sensor is mounted in/behind the front valance (can't remember whether it's driver or passenger side).

Any ideas? Because of the sudden hard failure, I'm thinking the sensor fell out of its mount and/or wires are broken. Car was recently serviced with a timing belt and water pump change, and I know some of the front parts were removed for the service; e.g., the lower air guide.

Also, anyone know a part number for the ambient air sensor, 2000 V70? Later V70s have the sensor mounted around rear view mirrors. On 98-00 V70s, the sensor is behind the front valance.