I hope someone in France speaks English, because I don't know where else to turn with this problem. The service personnel here in Romania didn't come up with a solution concerning this. I've got a 1.9 dci 2006 Renault Megane Bicorp, engine type F9QE8. The car is practically dead before around 2500, this being the rpm where it starts to develop power. The problem seems to be linked to the particle filter system, as I once cleaned it and the problem seemed to disappear. The car accelerated smoothly, you could feel the power at around 1500 rpm or even lower. I've been driving for around 100-150 km, when it suddenly came to its previous state, lacking power even at 2000 rpm. I thought there was a problem with the particle filter, so I decided to replace it. The guys at the service removed it, and I drove a couple of kilometers without the filter. The problem again seemed to disappear. The car ran smoothly for about the same distance (100-150 kms); nice acceleration, properly quick at low rpm. So it seems like the filter itself wasn't causing the problem, but still the particle filter system has something to do with it. I know there are two sensors installed in the back and at the front of the filter which measure and calculate the pressure of the exhaust gas before entering the filter and after exiting the filter, thus calculating a differential pressure. Could these sensors be broken, is this pressure important for the air/fuel mixture? The car isn't in limp mode, as at higher rpm and in higher gears the car flies and the problem is almost unnoticeable. So it seems to develop power, but it's somehow electronically limited so it doesn't develop it at low rpm. I'd gladly appreciate any suggestion with this problem. Thank you.