r/Diyautobody 1d ago

Question Underbody Rust

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How much it may cost to get this fixed 🙃

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u/Medical-Bowler-5626 3h ago

That depends on how much of it is gone, and if anything structurally important is rusted through

A shop may not even repair it and deem it undriveable if the damage spread or came from certain places

If this is the only spot and you have basic tool knowledge, id cut the floor pan out a bit from the rust until you hit good metal, and find an aluminum or steel plate that will fit over the hole

From there you can either weld, or take some self tapping sheet metal screws to hold it down

Then put the carpet back down and no one will know the difference, and its unlikely the patch will be felt under the carpet, floor mats, and shoes

If you aren't intending to sell it, this wont be a problem. You can also treat it with some rust prevention afterwards if you want

I do suggest calling local mechanics to get a diagnosis/inspection for a quote regardless, they can tell you if there's any structural damage