have a 97 nissan quest and my oil light came on the mechanic put a new switch in but now it is on again is it?

Question

is it safe to drive it with the oil light on

Answer 1

Not if the switch has already been replaced. The lights only come on when there is no oil pressure, or very low pressure. You could do serious damage to the engine if you keep driving it, provided you haven't already damaged it. Have a qualified mechanic check the pressure with an external guage before you think about driving it.