Engine warning light help

[Alex5]

I wonder if anyone could help,
I have a 182 cup which I brought from a dealer a couple of weeks ago, suddenly the engine warning light came on, no difference in driving. So I took it back to the dealer and they tried to diagnose it but they couldn't find a fault ,so they have reset the system so the light is now off and told me to wait a week or 2 to see if it comes back on.
Any ideas?they said possible lamba sensor

Cheers

 

[-J-]

Which light ? The SERV Light or one of the others?

 

[Alex5]

Orange light which looks like an engine on the right of the dash board

 

[walter22]

im sure the fault can be picked up on the machine even if its gone off its saved somehow?

 

[MicKPM]

If the engine symbol MIL was on then in short, a fault code would have been logged. Either they didn't want to tell you what the fault was (it happens a lot as a garage doesn't want you to go fix it yourself or take the work elsewhere) or the kit the were using was shite. I've seen a few Launch's struggle with EODB on Renaults before so if they're using one of these bits of kit avoid!

Mick