Couple Buying Car in Dealership

You’ve scoured listings, talked to sellers, and finally, you stumble upon a car that seems too good to be true. It’s the make and model you’ve always wanted, with a price that fits your budget like a glove. But before you jump headlong into the deal, it’s crucial to heed the warning signs that could turn your dream into a nightmare.

These 23 red flags are your trusty map through the used car jungle, ensuring that your next purchase is a success story, not a cautionary tale.

Unevenly Worn Tires

Finger pointing to damage on tire tread. Tire tread problems by tire pressure improper, Wheel alignment
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When you’re checking out a used car, take a good look at the tires. Uneven wear is a red flag that there might be deeper issues with the suspension or wheel alignment. These fixes can hit your wallet hard. Overinflated or underinflated tires are usually the culprits behind that uneven wear, but you never know.

Milky Substance Under the Oil Cap

Antifreeze and oil mix on oil filler cap
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Pop the hood and check the oil cap. If you spot a milky, frothy substance there, that’s a warning sign. This could mean water has gotten into the oil – a classic symptom of a blown head gasket, which is a pricey issue to have to fix. You don’t want a car that’s more at home in a repair shop than on the road.

Oil Under Car

Under Car
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Always make a point to peek under the car. If you spot oil leaks, that’s your cue to think twice. These leaks can be sneaky and lead to some prettey expensive repairs down the line. Plus, if a car’s leaking oil, it can be a sign of neglect or age.

Dirty Interior

Dirty Car
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A dirty interior might not seem like a big deal at first glance, but it’s actually a pretty revealing clue about how the car’s been treated. If the owner didn’t bother to clean it up to sell, chances are they weren’t too diligent about maintenance either. A bit of grime here and there is no disaster, but a car that’s a rolling trash can? That’s a different story.

The Car’s Airbag Warning Light Is On

Check Airbag Light
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An airbag warning light is a serious concern. It could mean the airbags aren’t working right or weren’t properly reinstalled after an accident. This is a safety issue that you don’t want to ignore. You want a car that’s going to protect you, not one that’s cutting corners on something as crucial as airbags.

Dirty/Sludgy Oil

Oil Dipstick
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The oil is super important, so give it a check. If it looks more like sludge than oil, that’s a red flag. Thick, dirty oil means the car’s maintenance has been more of an afterthought. You want oil that’s smooth and clean, not gunky. Neglected oil changes can lead to all kinds of engine problems, which means more money leaving your wallet.

Pulling to the Right or Left

Car driver man close up is hands on Car steering wheel While the turn signal is being turned on.
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Take the car for a test drive and see if it pulls to one side. This isn’t just annoying; it’s a sign that something’s off. It could be the alignment’s messed up, or maybe the steering components are on their last legs. Either way, you’re looking at repairs. A car that drives straight is a basic ask.

Weird Noises

Woman reading owner's manual of her car
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Make sure to really listen to the car when you’re taking it for a test drive. Any strange noises – clanging, grinding, squealing, or vibrating – are the car’s way of telling you something’s messed up. These sounds can mean expensive repairs are looming. You want your car to purr, not groan.

Check Engine Light Doesn’t Turn On When You Start the Car

Car driver starting the engine Start, stop engine button.
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When you start the car, the check engine light should flicker on briefly. If it doesn’t, that could mean someone’s tampered with it to hide a problem. If you notice that it never lights up, we would advise you to walk away. It’s always better to be safe than sorry.

Lights Not Working

Dashboard
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Flick every switch and make sure all the lights are working. Don’t forget the breaklights! Non-functioning lights can be annoying to fix. On top of that, sometimes they hint at deeper electrical issues.

White Smoke

White Smoke
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Keep an eye on the exhaust for white smoke. This is a symptom of coolant burning in the engine. That’s a big no-no that will cost you a pretty penny to fix. Smoke usually means there’s a serious problem under the hood.

Priced Weirdly Low

dollar and car key in male's hand inside car
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Everyone loves a bargain, but if a deal seems too good to be true, it usually is. A car priced way below market value is a red flag. It could mean the seller’s hiding something, or the car has issues they don’t want to deal with. Don’t let a low price blind you to potential problems. Remember, sometimes something cheap can be expensive in the long run.

Evidence of Wreck

Car Wreck
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Check the car for dents, scratches, mismatched paint, or anything else that screams, ‘I’ve been in a crash.’ Even small signs can point to a big past accident. You don’t want to inherit someone else’s collision problems. Collisions can lead to all kinds of hidden issues that might not surface until later.

Salvaged Title/No Title

Loading broken car on a tow truck on a roadside
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A salvaged title is a huge warning sign. It means the car’s been in a serious accident and was deemed a total loss by an insurance company.

No title? That’s even sketchier. It could mean the car’s stolen, and you definitely don’t want to get tangled up in that mess. Stick to cars with clear, clean titles. It’s just not worth the risk.

Signs of Water Damage

Water in Car
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Water damage can be sneaky. Look for rust, water stains, or dampness in the car. These signs can mean the car’s been through a flood or had a run-in with heavy rain. Water damage can cause all kinds of problems down the road.

No Record of Repairs

Accident Inspector Inspect damage car caused by car
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If there are no records of maintenance or repairs, that’s a bit of a question mark. I know not everyone keeps meticulous records, but having these records is a good sign the car’s been cared for. No records can mean you’re flying blind on the car’s history.

Warning Lights On the Dash

Many different car dashboard lights with warning lamps illuminated.
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When you start the car, keep an eye on the dashboard. Any lit warning lights are an automatic red flag. It could be something minor, but it could also be a sign of a major issue. Either way, you’re looking at potential repairs. And let’s be honest, no one likes surprises when it comes to car repairs.

AC/Heat Not Working

AC/Heater
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Make sure to test both the AC and the heater. If either one’s not working, you’re going to feel it, whether it’s sweltering summer heat or freezing winter cold. Plus, fixing HVAC issues can be pricey. You want a car that keeps you cool when it’s hot and warm when it’s cold, without costing you an arm and a leg.

Mismatched Paint or Body Panels

Body Paint
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Take a close look at the car’s paint and body panels. If things don’t match up, it’s a hint that the car might have been in an accident and patched up. This kind of patchwork can affect the car’s value and might indicate underlying issues.

Musky Smell

Woman Covering Her Nose From Bad Smell Inside The Car
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If the car smells like a damp basement, that’s a sign of potential water damage. Maybe a window was left open in the rain, or there was a spill that never got cleaned up. That musty smell can be tough to get rid of and could point to bigger problems like mold.

Signs of Rust

A graveyard of cars, broken cars sell on spare parts.
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If you see rust, especially large amounts, it’s a bad sign. Rust repair isn’t cheap, and it can be a sign of deeper structural problems. A little surface rust might not be a deal-breaker, but significant rust is a sign to walk away. Usually, vehicles from northern states will suffer from this more than those from southern states.

The Vehicle Is Already Running When You Arrive

Car Running
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If the car’s already running when you show up, be wary. The seller might be trying to hide a problem with starting the car. Make sure you get a chance to start it yourself from cold. You want to know the car’s going to fire up reliably, not just when it’s already warmed up.

Odometer Mileage Doesn’t Match

Car Dashboard
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Double-check that the mileage on the odometer lines up with the vehicle history report. If it doesn’t match up, it could be a sign of tampering. As frustrating as it is, this is a real issue that happens more times than you’d think.

Author: Abbie Clark

Title: Author and Editor

Expertise: Automotive, Parenting, Home and Garden, Budgeting

Abbie Clark is a writer, blog, and founder of Hey She Thrives and The Bearded Bunch.

From clever car cleaning tricks to the freshest car features and reviews, Abbie loves sharing her knowledge on everything automotive. Outside of her time writing for her websites, you’ll find her fishing with her husband, playing cars with her toddler, or baking up something sweet.

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