My 2000 ALH manual trans Jetta will not start. I checked the codes a while back and did not find any codes relevant to a no start condition. When I turn the starter over I do not see any rpms registering on the tach. I replaced the crank sensor and it did not help. One day while idling the motor just shut off and would not refire. After letting the car sit it refired and ran for 30 minutes before it shut down again. Now it will not refire at all. After changing the crank sensor I tried to recheck the codes and my reader said data link error. Any ideas.