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If you hadn't mentioned it being a Sport Tourer, I'd be asking if it was Eclipse coloured, with the Laguna lettering missing from the back and a scratch through the Renault badge on the boot.
If it's any consolation, my last car did this from brand new. It had various replacement sensors, but the problem never completely went away. Over three years later and about a fortnight before I replaced it, the dealer finally got around to properly diagnosing the fault and replacing one of the injectors. At least I'm assuming they finally got it right - maybe the new owner has the same problem.
If it's anything like mine, then it won't do it very often. If it's going to cost you money to sort out, then it may just be easier to live with it. I've only known one occasion where stopping and restarting the engine didn't clear the fault, and that was the time that they finally got around to replacing the injector.
Currently in Horatio's garage:
2010 Laguna III Initiale.