Rusted Frame or Body: Is the Car Still Worth Saving?

You can do a first look with a flashlight, but leave the rest to a shop. Do not crawl under a car held up only by a jack. Park on flat ground and stay out from underneath.

• Look at the bottom of the doors, rockers and wheel openings for bubbling or holes.
• Lift the carpet in the trunk and footwells, if you can, and look for rust or daylight.
• Notice wet carpets, which can be a sign of a hole or a bad seal.
• Watch for flakes of rusty metal under the car where it parks.
• Listen for new clunks, or doors that no longer line up.
• Smell for exhaust inside the car. If you smell it, do not drive it. Have it checked.

Then ask for a lift inspection. Some shops will tap or probe suspect metal. Fresh filler or undercoating can hide rust, especially on a car you bought recently, so tell them what you know of its history.

• Is this rust structural? Would it affect a crash, or how the suspension holds on?
• Is the car safe to drive today? Can I have your answer in writing?
• Can this be repaired by cutting out and welding in new metal, or is there too much rust?
• Do you do this work? If not, which kind of shop does?
• How far has it spread? Could you find more once you open it up?
• After the repair, how long before rust is likely to return nearby, and what would slow it?

A quote to fix structural rust should describe exactly what metal gets replaced. Be cautious of any approach that only covers the rust. Filler or undercoating over rot does not restore strength. Our guide to reading an estimate can help.

• The rust is on the surface, or on panels that can be replaced.
• The frame, floors and mounts test solid on a lift.
• A skilled shop can repair a small structural spot in clean surrounding metal and will put it in writing.
• The car is rare, valuable or sentimental enough that you will pay more than the numbers say, and you know it.
• It is otherwise healthy and has a reliable engine and transmission.

For early surface rust, ask a body shop about stopping it now. Slowing rust early is usually a far smaller decision than repairing it later. Keeping the car clean underneath and fixing water leaks also helps.

Rust is unlike a worn part. New metal can go in only where there is sound metal to attach it to. Lean toward letting the car go when:

• A shop says the frame, unibody or suspension mounts are unsafe and repair is impractical.
• Rust is widespread, and every repair would uncover more.
• Brake or fuel lines and the metal around them are badly rusted.
• The car also needs a big mechanical repair. Do not put a new engine or transmission in a rotting car.

Selling privately? Tell the buyer about the rust and what the shop told you. It is a safety issue for them too, and hiding it is not fair.

If a shop says it is unsafe, the car should not be driven at all, not even to a nearby yard. Have it towed. We tow free on a flatbed from driveways, garages, lots and the street, and the car does not need to run. The scrap car removal page explains how this works.

Rust can reduce strength, so tell us about it when you call. If parts of the body are missing or badly rotted, we need to know ahead of time so we can tell you whether we can take it. Incomplete vehicles may carry a pickup fee or may be declined.