Join Date: Dec 2005
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I would definately suspect ignition switch or starter motor.You say that starter has been tested,but if it works the majority of the time then fault is very difficult to diagnose.As Ivor E Tower has said,Renault immobilisors don't stop the engine turning over.Is your car an automatic,because they have a switch to stop the engine turning over when not in park or neutral?.If so,switch could be faulty.
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo