I Have a Fiat Doblo 1.9JTD 05 Reg. The Amber Engine Light has come on in the last Couple of Days. The Car appears to Run OK but the Light stays on all the Time and will not go out. Ive checked my Hand Book. It Says there is a Fault in the Fuel, Ignition or Injection System and the Car should be checked by Fiat. I would Prefer to avoid having to go to the Garage at all if Possible by way of sorting it out Myself. Can anybody Help with what may be Wrong?

You really need to get the codes read to find out what fault it's seeing, otherwise you're just guessing unless there are any other symptoms ie. poor running, lumpy idle, difficulty starting, etc. Without knowing what the problem is you could end up just throwing money at various things which have no issues.