can they actually get into the system to diagnose it and its reporting no errors ,if so go for crank shaft sensor ,
Immobilizer fault would show up in the U C H (B S I/B C M)
Again depending what diagnostic machine they are using,some really wont read renault systems and report no errors,
When you say it wont turn over at times ,do you mean it wont crank,get them to test the brake and clutch switch wiring ,the clutch switch is on the clutch pedal bracket ,the brake switch is in the passenger side of the car below the glove box ,this is not easy to see but it is in that area ,these can be tested without removing with Renault diagnostic machines,dont know if other diagnostic machines can ,
Fuel pump wont work if crank signal is not present,
Again this should be able to be tested on live data even on cranking and it should show between 200 to 250 rpm (x 4 would equal engine running)this would show a crank signal and not needed to be checked by the exchange method (removing and replacing) this needs to be tried while starting
Have they tried easy start,to prove the engine is in running order and not in itself an issue
sorry might seem a long post but if you ask them the question and they can not give you an answer at least you will have some info to point them to where to look
But please remember to be very diplomatic how you put it over because us smart **** mechanics think we know everything when it comes to diagnostics (YEAH RIGHT),but we dont and could never do else we wouldnt need a computer and we could plug our fingers into the obd port ,,good luck with it ,
Currently in ours2012's garage:
bmw 318 fiat doblo corsa mondeo (megane we dont talk about)mazda 6
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Megane 2005 Won't start
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