Rear parking sensors not working

First thing I would check is to see if the reverse lights are working o.k as usually tied in with parking sensor circuit .

Thanks for the message, reversing lamp is working ok. Where else should I look for the fault?

Put ignition on , car in reverse and go to the rear of car and put your ear next to sensors and see if any are not making a noise .

Thanks for that. Tried it and no noise, got my neighbour to double check and he confirmed it - anything else I can do?

Check fuse f14 in case it's tied in to fault , if not you need to get it scanned

2008
Dashboard Fuse box
Instrument panel fuse box diagram: Peugeot 308 (2008)





Assignment of the fuses in the Dashboard Fuse box (2008)
N° Rating Functions
F1 - Not used.
F2 - Not used.
F3 5 A Air bags and pretensioners control unit.
F4 10 A Clutch pedal and dual-function brake switches, electrochromatic interior mirror, air conditioning, steering wheel angle sensor, automatic gearbox, switching and protection unit.
F5 30 A Front one-touch electric windows, folding mirrors supply.
F6 30 A Rear one-touch electric windows, exterior door opening controls.
F7 5 A Front and rear courtesy lights, map reading lights, sun visor lighting, glove box lighting.
F8 20 A Audio equipment, audio/telephone, CD changer, multifunction display, tyre under-infl ation detection, interior storage compartments.
F9 30 A Front 12 V socket, lighter.
F10 15 A Steering wheel controls, alarm siren, alarm control unit.
F11 15 A Low current ignition switch.
F12 15 A Instrument panel, seat belt and passenger's front air bag warning lights display, air conditioning, driver's seat memory unit, retractable roof unit.
F13 5 A Engine fuse box, air bags.
F14 15 A Multifunction display, amplifi er, hands-free kit, rain/ brightness sensor, parking assistance control unit, passenger's seat memory unit.
F15 30 A Locking and deadlocking.
F17 40 A Rear screen and exterior mirrors de-icing.
SH - PARC shunt.
G36 30 A Driver and passenger heated seats.
G37 5 A Trailer fuse box.
G38 30 A Driver’s seat memory unit.
G39 - Not used.
G40 30 A Hi-Fi amplifier, passenger's seat

and

https://www.youtube.com/watch?v=404M_haG6J4.

Thanks very much, I'll check as you suggest - if no result then I'll get it looked at

Regards