2003 Clio 1500 DCI Turbo Problem

That certainly doesn't sound like a turbo fault at all, more like an ECU or sensor problem. It'll need plugging into a diagnostic computer to isolate the cause. A turbo fault is unlikely to be cleared by switching off and back on again.

Morse

That depends. There's a common problem that can afflict VAG engines with a VGT (VNT) turbo, that can be temporarily cleared by shutting off the ignition.

I have no idea if this is the case with this Clio engine though.

Just had a similar thing happen on my DCi 100 clio probably unrelated but the plastic pipe from intercooler to inlet manifold "broke" in half on a plastic welded joint resulting in bugger all power drives like a 1.2 petrol. A new hose costs 114 quid plus vat from Renault, various attempts to fix using duct tape have failed, reckon i will have to find some rubber pipe of the right diameter and splice it all together with jubilee clips.

Dilbert