I have a 2000 S430 and the car lowers down on all sides overnight or a few days. But it raises up when i crank up? I really need help because I don't want to buy a lot of things I don't need. thanks


If it is lowering in all wheels you have a leak in the air lines or valve block. You don't need to replace the air bags. 

Inspect for leaks. Have you tried that yet? 

I tried to check the lines with spraying the water method but I couldn't find any leaks? Thanks

Do you have star diagnostics scanner? Or know someone who does? 

There are a number test that you can perform with that scanner. 

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