Just replace it mate, you will be surprised by the difference.
It could even be starting to fray at the pedal end and jamming up in the outer casing (Ive seen 3 cars do this)
It will either snap or stick wide open one day
www.eurocarparts.com waitey, alot cheaper than Renault for the same friggin part!
Odd comes up for not having one for a PH1 172.