This discussion started a looonnnnggg time ago but will add my two cents nonetheless just to confirm what was said earlier (in case someone else lands here). I had the same problem with my 2002 Espace III DCi, 165k miles, and the Renault garage was not able to find the problem ('time to get rid of the car'). Searching these forums led me to replace all the injectors and the problem was solved.
The Renault garage did do a diagnostic test on the injectors and the result was fine. So this fault (whereby one or more of the injectors returns too much fuel at certain loads as per other forum discussions) is not something the diagnostics pick up, nor does the onboard computer flag the issue as a fault when it happens. The engine simply stops dead with no error message on the dashboard at all.
I did discuss replacing the injectors with the Renault garage but the message was: difficult/impossible since it would be very hard to remove the injectors. Seized in place... So I did it myself. I even built a solid steel special tool to pull out the injectors but only after building this tool (a complete frame to sit over the cylinder head with pulley to grip and pull the injector) I realised that the injectors were actually very easy to extract!! Ordered new injectors, returned the old ones to get some money back and the engine runs absolutely fine. I think diesels should run till at least 200k miles...
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