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Not sure what your asking here as your english is more polish but i think you mean the cold start pre heater relay for the glow plugs or heater plugs and yes i have had this problem where the light in the dash is on but the heater plugs are not on and this just a warning light fault in the unit and is not a cause of loss of power but a faulty EGR valve will cause this so make a blanking gasket to seal the valve off and iam sure this will cure it -?-? but be carefull here with the diagnostics with these lovely french cars as a faulty throttle pedal control up under the dash will cause loss of power and lots of weird things with the engine light and the heater plug warning light ,these renaults are a rule unto themselves and although mechanically superior to most vehicles the electrics and the diagnostics leave a lot to be desired by this manufacturer
hallo 1.5 or 1.9 dci does not engage glow plugs until -4?C or below. so, check if fuel does not drain (in the morning). or if batery is week. try start with cabels (jump start) and see if start sooner. another thong is if EGR valve always stays open (stick) hope it helps Marko
Unfortunately the F9Q (1.9 DCi) has 3 common faults, these are as follows
1. MAFS Mass air flow sensor - this will cause initially hesitation but eventually make the car really slow as the turbo waste gate will no longer open.
2. EGR - Exhaust gas recurcultion valve - a result fro the forementioned, the MAFS failure causes high carbon build up, this sticks to the valve and siezes it open, this causes an inlet pressure fault code
3. In-line fuel pump - this pump is a 3bar pressure pump that really plays up then gives up the ghost, hence *non starter* it could be hidden away somewhere on the chassis, you need to look for it, it could be mounted under an wheel arch etc. It is about 5" long and 2.5" diametre, it is inline so a pipe at either end and 2 wires going to it.
I bet my last dollar thats what is up. It fits in with what you said.