P113A code keeps coming

Hey guys. 2015 WRX. I keep having a recurring P113A code popping up. It’s more frequent as it gets colder, but still pops up every now and again in the summer. It stays on and goes away on its own and then comes back. Any ideas for fixing? The internet isn’t super helpful and even threads on here aren’t great. But any advice is appreciated and a definitive fix would be amazing. Thanks