2000 Peugeot 307 beeping, oil pressure

Have you checked your oil level,then if okay check your switch for oil pressure is not leaking and that the connection is ok.

Had oil and filter change, also new switch. Oil pressure checked, that's fine.

Then it,s probably an electrical issue either with the wiring to the sensor or connection issue ,it may be easier to get a spark to look at it as there is a process for checking this assuming it,s happening frequent

Happens often,, more so when coming to a stop.
Will it be expensive to get sorted?