MBClub UK is in no way affiliated with Mercedes-Benz, DaimlerChrysler or any of their respective trademarks. The stop start refused to work,had numerous false fault lights on dash randomly which vcds said nff. After about 5 mins of driving the light went off and I didn't see it on again all the way home (20 mins). From past topics, I believe you need a tech visit as the plug-top power supply is not a part that can be sent out. We had the problem this weekend when we were on a long journey and stopped (in a lay-by) to feed the (screaming) baby.

Yeah definately needs new glow plugs mine was doing exactly same and now has new NGK ones and is fine. To the extent I'm nearly surprised it didn't get lit when the "test cheat" software or "defeat device" had kicked in to indicate the ECU had detected the car was on test [Joke! I was driving along the motorway and the diesel glow light plug started to flash and I was losing power.The thing is so much trouble if my wife uses it on lots of short journeys that I'm tempted to do one of the re-maps that are being offered online to take the EGR valve out of the ECU completely - they claim 15% more power and better economy. Coil/sparkplug/engine management light comes on and the car goes into limp home mode, this started after I put petrol in it and drive it for 2 mins, it has since been flushed and cleaned (nothing replaced) but I'm now having this problem.

When the regeneration is ongoing, the rpm at idle stay at around 1000 and the start/stop is disabled. If it doesn't do it again over Christmas then I think I will cancel garage visit and just see how it goes. the only way you truely know whether you need to change the glow plugs is when your car starts to struggle on cold mornings when starting it such as the mornings we are having. e. engine loaded) as opposed to being sat in a car park with a computer revving the nuts of your car.As it looks like I need to replace the relay, can someone tell me what is the maximum ampage fuse/relay combination that I would be able to put on a 110A Numax deep cycle LB. This will trip into restricted performance when accelerated hard, often flags an engine DTC (engine management light on) P0251 if it repeats often enough.