Only if your OAT probe is exposed to RAM air.

WRONG.  The error occurs in varying amounts depending on the where the probe is mounted on the skin.  On the leading edge, the error is the Ram air , but the mix between the two depends on the local velocity where the probe is mounted. 

In other words, the OAT sensor error is inescapable.  But you can correct as Bruce notes, using either a pencil or calculator, or your black box, if it was set up to do so.

Fred