I have a 52-plate Renault megane/scenic 1.9dci with 143,000miles on her..have tackled a few jobs just finished putting the manifolds and turbo back together along with the cats not bad a 2-day around and runs smoother although i do have an issue with the 'engine management /glow plug light' coming on in a morning on the first 50mph road i come to, The car starts fine no smoke,it takes about 4-5 minutes to get to the 50mph road and once on it i put her into 4th get her to 50 mph and the light comes on, no drop in performance doing mid 40's to the gallon, i stop turn her off then restart and it goes out and stays out, i drive back home later in the day and no light at all..i have de-coked the 'egr' and all moves as it should checked turbo and runs like a good-en...what code reader would i need to be able to read the codes? i have a basic one but doesn't show any faults allthough their clearly is...the cars got a few more years left in her yet so want to keep it running right so any help would be appreciated.
many thanks.