Need advice deciding what to do with my Jetta
 

I'm in California and I have a 2009 Jetta station wagon that I purchased brand new. Since then, I have had to take it into the shop three times because the check engine light has come on. The second time they even replaced the car computer which they said was faulty.

I am very conerned I may have a lemon and that this problem will continue after the manufacturer warranty runs out. Does anyone knows if there are applicable laws here? How does VW deal with situations like this? Who do I have to contact?

Thanks.