I have a 2000 9-3 Recently the engine and transmission lights have been coming on every once in a while. The car also switches to the limp mode, will not accelerate and comes to a stop. Can not find any problem with the car. No error codes. Just once in a while the car acts up and the engine and transmission lights come on, followed by limp mode. Why does the car go into limp mode what are the causes? Thank you!