I have a renult megan 1.5 dci wen ever i go over 70mph it indicates check injector what is the fault &how can i fix it, its on an 04 reg

Repair the injector fault. with out injectors working there is no fuel to burn...thus no start. A little starting fluid in the intake throttle body should make it start momentarily

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Hello there,
Fault codes below

P0251 Injection Pump Fuel Metering Control "A"(Cam/rotor/Injector)
P12XX Fuel and Air Metering

No idea what it means but obviously fuel / fuel pump /injectors problem

What are the fault codes. Also it is still missing when you rev it up, the increased engine speed masks the missfire.

I would be looking inside the fan box as it is normally cooled by the air that is drawn in by the fan

Sorry renault only for diagnostics for this fault

Change the Transmision oil

its a renault ??what else do you expect its an electrical nightmare

i have a 1.5 dci 2005 renault megane and it will not start it was running fine then injection fault came up on dash bored ive changed the injectors and the fuel filter what,
what could be the problem

my warning light comes on saying "check emissions" and the manual tells me to go to my Renault dealer immediately. What is wrong? Can we drive the car normally for any distance

Check your plugs again, make sure they aren't gunked up already or covered in oil or anything. Double check the spark gaps on them as well.