I cant help much on its location if it does have one, maybe have a search on the Renault forums.
Some sensors even though they are branded Bosch can be fakes, especially if purchased from amazon or ebay so i personally try to buy from reputable sources.
Maybe identify where the control module is and check for water ingress.
As said diagnostic equipment should allow you to test the system but it has to be very good equipment which most dont have.
You need to go back to basics and check if the starter solenoid is getting the correct voltage.
A test light made from an old headlight bulb is useful for this, something to put a load on the circuit.
Makita are good and it makes sense if you have the batteries, as above though regarding tight wheel nuts, only the really beastly ones will stand a chance of doing them.
I have an 18 volt Ryobi and it will fail with an even slightly over tightened wheel nut, some are better than others though.
I do use it on installing wheel nuts but always just make sure its on its lowest setting for tightening and then check with the torque wrench.
Bilt Hamber Autowheels is the best wheel cleaner ive used but it did struggle with some really baked on stuff i tried it on.
Wonder Wheels acidic version is worth a try as suggested, not sure if halfords sell it these days.