Mk 6 crunching in 2nd
 

Hi, recently bought the mk6 1.2, every time i put it into 2nd it crunches without fail, please could someone tell me if i need a new box? I am going to put new transmission fluid in. But it only does it in 2nd. And the taco isn't working. The car was standing so will be putting in a new battery will that help?Thank you