help "take car to dealership" what does it mean

[keithhr1]

I've been a big toyota fan and talked my girl friend into getting a new camry 4 years ago and it's been trouble free. However , when coming home tonight, she said a service light came on in the car and it was the light which indicated that the car should be taken to the dealer. She is afraid to drive the car because she doesn't know what that warning means. She doesn't know if it is a service reminder, an indicator that something is seriously wrong or something like that. There was no further information in the manual and any help or suggestions would be appreciated.

[Jzs147-RR]

Dont worry the car is ok it has just locked into safe mode,all you have to do is go to the dealer and get the engine code .I had a simular problem when my knock sensor died on my this year.Dont worry you can drive the car but just not over 120KPH

[erfan]

how do you know if your knock sensor has gone out?