Renault Scenic Check Emission codes?

Hi!

My mother id driving a Renault Scenic from 2005, it has around 85.000 on board now. About 10 days ago the "check emissions" light appeared, together with the "service" one. After that, the car started to suddenly lose power and stop- first once every two days, then several times a day- then it completely went dead (including door opening/closing etc).

We juped-started it this morning and took it to the dealer's. They changed the battery (after their diagnostic tool clearly inndicated "change accu",and the green light did not appear on it). For "check emmissions" they gave us the following two codes:

DF092 (something about lamda sonde) si DF119 (something about a sensor- it was all in Dutch, which I don't really speak).

They said they reseted the message, and if it comes back we should go back into service. I would like to know what o expect if we go back- and if we don't since this car has already spent a while in service this month (two weeks ago the whole board panel went dark and we had it in service for 4 days while they repaired that, cheaper than getting a new one).

Any other information I should add, please let me know!

Thnaks a lot!