If your car is displaying a P219A code, it means that the engine is running too lean. This can be caused by a number of things, including a dirty air filter, leaking vacuum hoses, or a faulty oxygen sensor.
To fix this problem, you'll need to diagnose and repair the underlying cause. Start by checking your air filter and replacing it if it's dirty. Then, inspect all of your vacuum hoses for any leaks. If you find any, replace them with new ones. Finally, check your oxygen sensor and replace it if it's faulty.