When you say shutdown I assume you mean 'limp' mode where RPM is limited. My old Xantia used to do similar occasionally. In that case it was weak point in the induction circuit where a flexible hose was prone to split leading to the car's CPU assuming a turbo fault. While it's kicking in under acceleration can feel like hitting a wall it's a risk that once known can be mitigated by careful driving.
The dealer sounds pretty useless; computer says Y/N sort of stuff. Can you find a local specialist. We have one here in Northampton who majors on the 3 French brands and is very good. I'd have thought Lamda sensors, MAP or something in the injection plumbing would, given petrol smell, be much more likely cause than wiring to lights.
Alternatively, have you tried the French Car Forum or any Renault only group, perhaps under auspices of owners' club. I'll bet you're not the only Clio owner to experience this.
Edited by Bromptonaut on 23/09/2013 at 13:01
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