1999 328i check engine warning light
Hi I'm a new owner of a 1999 328i and new to this forum. I just had my thermostat, upper radiator hose, and expansion tank replaced. When I picked it up I went straight to gas station to put gas then soon after the check engine warning light lit up.
I asked the previous owner and he said that it usually lights up after a diagnosis and should turn off after running certain number of miles. Is his statement true or should I be more concerned?