Front bumper off to change the sensors. Only takes 20 mins or so. Did my Laguna 3, very similar process. Decent video for the Scenic 3 here. Just remember to undo any electrical and/or washer pipes before pulling the bumper too far off, also, a blanket or similar to rest it on.

 

Try something first. Go into the car "settings" and turn off the parking sensor sound (or turn volume to zero if the option is there). See if this stops the warning. This will rule out the alarm buzzer/chime which gives the same fault warning. If you have access to a Renault compatible code reader, check what the code(s) is.
See if you can identify the faulty sensor first; before removing body panels. You might be able to do this by listening to each one close up. Plenty of advice on Youtube

 

Hi, i’ve tried the volume setting on my scenic and the fault shuts off when i set volume to 0. Now my question is, do the front and rear sensors share the same buzzer/chime, as the rear sensors have no problems and they’re working fine

 

Is this the same problem as the original post? As I said above if the warning stops with the volume turned off, likely the buzzer is at fault. I can't answer the second part of your question but if you search this forum you will find I had a similar problem some years ago.

 

Go to parksouq.com, find your car, or something close, then look at section 83 under "proximity radar". You will likely find buzzers for both the front and rear sensors. Sounds like your front one is the problem.
If you can locate the front buzzer it's easy enough to disconnect. A simple resistance check (should be 50-60ohm if I remember) will show if it is faulty. Parksouq will have already given you the part number. A Renault diagnostic code will confirm the diagnosis. All credits in the end to @ours2012 who solved my original issue 10 years ago.

 

Thank you very much, i’ll check it out.