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Noise in a pothole plus the car sagging on one side is definitely a sign of a worn spring, especially in a 307 that old. You need to take it to a mechanic you trust so they can check it out, because it could be just the spring or the shock absorber too, and then the price varies a lot depending on what needs to be replaced and which shop you go to.

When the car sits lower on one side and makes noise over potholes, there's a good chance it's the spring, especially on a 2008 307 that's already got some mileage on it. The thing is, it could just be the spring, could be the shock absorber too, or even the sway bar - that's why it's really important to take it to a mechanic so he can inspect it with the car lifted and figure out what's actually going on. The cost varies a lot depending on whether you're just replacing the spring or the shock absorber as well, but it's expensive enough that you'll want to get it checked urgently before it damages something else.

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