Xantia HDI check engine light

[Stewart(oily)]

This morning my check engine light illuminated, I was pretty much full throttle in top at 70mph or so, it remained lit for the rest of the journey though the car was running fine, after standing for a couple of hours I restarted and the light was still there, it went out after half a mile ? all fluids correct, no other symptoms.
Should I worry ?

[Mandrake]

Without getting the fault code read on a Lexia there's really no way to know what it is and whether its serious or minor... It could be something as simple as a blocked fuel filter.

After putting my Lexia on RichardW's Xantia HDi yesterday I'm staggered at just how many engine parameters the ECU monitors on an HDi ! Lots of potential things for it to get upset about...

[RichardW]

As it occurred under load, most likely is turbo overpressure (although that normally shuts it down to limp mode) caused by the solenoid valve not working properly, or low fuel pressure caused by blocked filter or failing LP pump. As Mandrake says, getting it on a Lexia will reveal what it's upset about. They do seem to put the light out after a short while if there is a temporary fault - mine did that after the LP pump failed. Unlike the C4 which kept the light on and beeped 'Depollution system faulty" every time it was started till we cleared the fault with the Lexia, even though the original fault (low fuel pressure caused by blocked filter) had been fixed.