I had that problem. Push the lid down, past level, you could hear the "click", but it wouldn't stay locked. Took out the entire cup holder, lid, etc. Take the screw out of the metal tension/ spring thingie on the side,holding the small metal bar. You can bend the spring tab piece to give more tension on the metal lock bar, OR you can put on a metal washer under the screw, so it gives more support to the tab & give more tension on the small metal lock bar. Hope you understand. If more people have problems, I'll take a pic of what I mean.