can any one help me cos i'am at a loose end on what to do next, code number iso-9141-2 has come up on my code reader?

 

That is your code reader, It's not a code.

 

but the engine light is still on?, as soon as i turn it off and take the key out, the next time i start it up again the light comes back on?

 

Aside from the check engine light, is the car operate normally? For example, is it easy to start, smooth idle, good acceleration, normal gas mileage?

If you don't have a code reader, most major auto part stores will read the codes for free. Write down the codes and we'll help interpret them.

 

fatmanbilly, the code iso-9141-2 is a QA (quality assurance) standard. So, if you are getting that on your code reader, then I am willing to bet that you have a problem with your code reader, not the car.

With that being said, if you have a check engine light on, then I would recommend getting a different code reader and seeing what that one says. We can then help you from there.