Dont touch Reanult main dealers unless you have to
About ten years ago red light on dashboard 2 year old Renault Megane 2 litre
100 miles from home called AA out, it was the gearbox warning light, sent me to Renault in Salisbury.
after inspection told i needed a new auto gearbox, cost 2400 + labour
they also said gearbox oil was low and charged me £60 for inspection and for topping up oil to get me home, and said the gearbox has a "get you home mode" which limits speed etc but would do the job.
Next day got in car and red light didnt come on and car was performing normally........turns out nothing wrong with gearbox, just low auto oil level, 33,000 miles later same red light , i topped it up and light goes out.
Renault key stopped working , went to local main dealer, wanted about £130 to replace and sort it out.
Used spare and mean while took key apart, turned out the red led transmitter had become unsoldered, cost to resolder £0 !