Donate |

Inspecting a used car

A careful evaluation will help you steer clear of hidden problems

Last updated: May 2014

Finding a trouble-free used car has nothing to do with luck and everything to do with applying good research and investigative skills. Knowing how to spot potential problems and determining how reliable a used vehicle is can save you from expensive automotive headaches down the road. The following advice can help you to avoid a lemon and find a good value.

Homework

To reduce the risk of purchasing a trouble-prone vehicle, identify models with a good reliability record before you begin shopping. Consumer Reports’ annual subscriber survey provides exclusive real-world reliability information that can help you narrow your selections. See our list of the best and worst used cars. Also read the reliability-history charts that accompany most of the car model pages to get a more detailed view at how specific vehicles have held up in 17 trouble areas, as well as overall. If the car you’re interested in is known to have certain trouble spots, you know to pay special attention to those components during inspection.

Read the window sticker

The Federal Trade Commission requires dealers to post a Buyer's Guide in every used vehicle offered for sale. Usually attached to a window, it must contain certain information, including whether the vehicle is being sold "as is" or with a warranty, and what percentage of repair costs (if any) the dealer is obligated to pay. The Guide information overrides any contrary provisions in your sales contract. In other words, if the Guide says that the vehicle is covered by a warranty, the dealer must honor that warranty. If any changes in coverage are negotiated, the Guide must be altered to reflect them before the sale.

If a sale is designated "as is," it means that the dealer makes no guarantees as to the condition of the vehicle, so any problems that arise after you have made the purchase will be your responsibility. Many states do not allow as-is sales on vehicles selling for more than a certain price.

Inspection

No matter whom you buy from, always look over the vehicle thoroughly and, if possible, take it to a mechanic for a complete inspection. Dress in old clothes and give the car a good going-over. You can learn a great deal just by using your eyes, ears, and nose.

Take along a friend for help. Do your inspection in broad daylight on a dry day as floodlighted lots can make cars look shiny and hide body defects. The car should be parked on a level surface and shouldn’t have been driven for at least an hour before your inspection.

Exterior

Body condition. Check each body panel and the roof, looking for scratches, dents, and rust. Examine the lines of the fenders and doors. Misaligned panels or large gaps can indicate either sloppy assembly at the factory or shoddy repair. The paint color and finish should be the same on every body panel.

If you think a dent may have been patched with body filler, put a small mag­net on it; it won’t stick to an area with body filler. If other parts of the car have been repainted, there may be paint adhering to the rubber seals around the hood and trunk lid.

Minor cosmetic flaws and light scratches are no cause for concern, but rust is. Check the outer body for blistered paint or rust. Also inspect the wheel wells, the rocker panels beneath the doors, and the door bottoms. Bring a flashlight for looking inside the wheel wells for rust.

Open and close each door, the hood, and the trunk. Gently lift and let go of each door, partic­ularly the driver’s door. If it seems loose on its hinges, the car has seen hard or long use. Inspect any rubber seal for tearing or rot.

Glass. Look carefully at the vehicle glass to make sure there are no cracks or large, pocked areas. A small stone chip may not be cause for alarm, though you should bring it up as a bargaining point in nego­tiations. But cracks in the windshield will worsen and lead to a costly repair.

Suspension. Walk around the car to see if it’s standing level. Bounce each corner up and down. If the shock absorbers are in good shape, the car should rebound just once; it shouldn’t keep moving up and down. Grab the top of each front tire and tug it back and forth. If you feel play in it or hear a clunking or ticking sound, the wheel bearings or suspension joints may be shot.

Lights and lenses. Have a friend confirm that all lights are working. Make sure all light lenses and reflectors are intact and not cracked, fogged with moisture, or missing.

Tires. You can tell a lot from the tires. A car with less than, say, 20,000 miles on the odometer should probably still have its original tires. Be wary of a low-mileage car with new tires; the vehicle’s odometer may have been rolled back. Also check that all four tires are the same. Any different tires may show that they have been replaced.

Tread wear should be even across the width of the tread and the same on the left and right sides of the car. Ask if the tires have been regularly rotated. If not, the wear is usually more severe on the drive wheels.

Aggressive drivers tend to put heavy wear on the outside shoulder of the front tires, at the edge of the sidewall. Assume that the car has been driven hard if that area shows heavier wear.

Tires that have been driven while overinflated tend to wear more in the middle than on the sides. Chronically underinflated tires show more wear on the sides. Cupped tires, those that are worn unevenly along the tread’s circumference, may be a sign of a problem with the steering, suspension, or brakes.

Tires must have at least 1/16 inch of tread to be legal. Check the tread depth with a tread-depth tool (available at auto-parts stores) or a quarter. Insert the quarter into the tread groove, with Washington’s head down. If you can see the top of his head, the tire should be replaced.

Examine the sidewalls for scuffing, cracks, or bulges, and look on the edge of each rim for dents or cracks. And be sure to check that the spare is in good shape and that the proper jack and lug wrench are present.

Interior

It’s the inside of a car that may matter most since that’s where you’ll be spending the most time.

Odor. When you first open the car door, sniff the interior. A musty, moldy, or mildewy smell could indicate water leaks. Remove the floor mats and check for wet spots on the carpet. An acrid smell may indicate that the car was used by a smoker. Check the lighter and ashtray for evi­dence. Some odors, such as mold or smoke, can be very hard to get rid of. If you don’t like what you smell, find another car.

Seats. Try out all the seats even though you may not plan to sit in the rear. Upholstery shouldn’t be ripped or badly worn, particularly in a car with low mileage. Try all the seat adjustments to make sure they work properly and that you can find a good driving position.

Pedals. The rubber on the brake, clutch, and gas pedals gives an indication of use. A car with low miles shouldn’t show much wear. Pedal rubber that’s worn through in spots—or brand-new—indicates that the car has been driven a lot.

Instruments and controls. Turn the ignition switch, but without starting the en­gine. All the warning lights—including the “Check engine” light—should illuminate for a few seconds and go off when you start the engine. Note if the engine is hard to start when cold and if it idles smoothly. Then try out every switch, button, and lever.

With the engine running, turn on the heater full blast to see how hot it gets, and how quickly. Switch on the air conditioning and make sure it quickly blows cold.

Sound system. Check radio reception on AM and FM. If there is a CD player, try loading and ejecting a disc. If you plan on using an MP3 player or an iPod in the car, bring that along and test out the connection if there is one.

Roof. Check the headliner and roof trim for stains or sags to see if water is leaking through the sunroof, ill-fitting doors, or windows. If equipped with a sunroof or moonroof, check to see if it opens and closes properly and seals well when shut. Inspect the convertible top for tears by shining a flashlight up into it.

Trunk. Use your nose as well as your eyes. Sniff and look for signs of water entry. See if the carpeting feels wet or smells musty, and check the spare-tire well for water or rust.

Under the hood: Engine related components

It’s best to make these checks with the engine cool. Look first at the general condition of the engine bay. Dirt and dust are normal, but be wary if you see oil splattered about or on the pavement under the engine compartment. Also watch for a battery covered with corrosion, or wires and hoses hang­ing loose.

Hoses and belts. Squeeze the vari­ous rubber hoses running to the radiator, air conditioner, and other parts. The rubber should be firm and supple, not rock-hard, cracked, or mushy. Feel the drive belts to determine whether they are frayed.

Fluids. The owner’s manual will point out where to look to check all fluid levels. Engine oil should be dark brown or black, but not gritty. If the oil is honey-colored, it was just changed. If the dipstick has water droplets on it or gray or foamy oil, it could indicate a cracked engine block or blown head gasket, two serious problems. Transmission fluid should be pinkish, not brown, and smell like oil, with no “burnt” odor. The dipstick shouldn’t leave visible metal particles on the rag, another sign of a serious problem.

Check the automatic-transmission fluid with the engine warmed up and running. On some, the dipstick has two sets of marks for checking when the engine is either cold or warm. Power-steering and brake-fluid levels should be within the safe zone.

Radiator. Look into the plastic reservoir that’s connected by a rubber hose to the radiator. The coolant should be greenish or orange, not a milky or rusty color. Greenish stains on the outside of the radiator are a sign of pinhole leaks.

Battery. Some “maintenance free” batteries have a built-in charge indicator. A green indicator usually means the battery is in good shape; yellow or black usually means it is dying or dead. These indicators reveal the condition of just one cell and may not give an accurate reading on the health of the whole battery. If the battery has filler caps, wipe off the top with a rag, then carefully pry off or unscrew the caps to look at the liquid electrolyte level. A low level may mean that the battery has been working too hard. A mechanic can check out the charging system and do a “load test” on the battery.

Under the vehicle

If you can find where a car was usually parked, see if that part of the garage floor or driveway is marked from old puddles of gasoline, oil, coolant, or transmission fluid. Clear water that drips from under the car on a hot day is probably just water condensed from the air conditioner.

Feel the tailpipe for residue. If it’s black and greasy, it means burnt oil. Tailpipe smudge should be dry and dark gray. While some rust is normal, heavy rust might be OK but could mean a new exhaust system might be needed.

If the vehicle is high enough to slide under, you may be able to do some basic checks underneath. (If not, make sure your mechanic checks it.) Spread an old blanket on the ground and look under the engine with a flashlight. If you see oil drips, oily leaks, or green or red fluid on the engine or the pavement beneath the car, it’s not a good sign.

On a front-wheel-drive car, examine the constant-velocity-joint boots inboard of the front wheels. They are round, black, rubber bellows at the ends of the axle shafts. If the boots are split and leak­ing grease, assume that the car has bad CV joints, another costly repair.

Structural components with kinks and large dents in the floor pan or fuel tank all indicate a past accident. Welding on the frame suggests a damaged section might have been replaced or cut out to perform repair work. Fresh undercoating may hide recent structural repairs.

Take the car to an independent mechanic

Before you close the deal, have it scru­tinized by a repair shop that routinely does diagnostic work. A dealer should have no problem lending you the car to have it inspected as long as you leave identification. If a salesperson tells you that an independent inspection is not necessary because the dealership has already done it, insist on having your mechanic look at it. If a private seller is reluctant to let you drive the car to a shop, offer to follow the seller to the shop where the inspection will take place.

A thorough diagnosis should cost around $100, but check the price in advance. Ask the mechanic for a written report detailing the car’s condition, noting any problems found and the cost to repair them. You can then use the report in the negotiation with the seller.

If you don’t know of a repair shop with which you feel comfortable, try to get a referral from some­one you trust. You can also ask for the name of a good shop at a local auto-parts store. If you can’t get referrals, you can find shops on the Yellow Pages website or at the Car Care Council’s website (www.carcare.org). This is an organization supported by the auto aftermarket industry, but there are no performance criteria for shops listed on the site.

To check for complaints about any shops you aren’t familiar with, research them at the Better Business Bureau’s website. Members of the American Auto­mobile Association (AAA) can use one of its recommended facilities.  

If you’re visiting a shop for the first time, look for certificates or window decals from AAA or the National Institute for Automotive Service Excellence (ASE). AAA-certified garages must meet certain quality standards. The ASE grants certificates to mechanics who pass exams in any of eight areas of expertise. The institute does not certify shops as a whole, but if 75 percent of the employees are ASE-certified, the shop can carry the seal.

Used car buying guide

Learn more about choosing a used car, avoiding a lemon, buying and selling a used car, pricing and financing, and more in our used car buying guide.


   

E-mail Newsletters

FREE e-mail Newsletters!
Choose from cars, safety, health, and more!
Already signed-up?
Manage your newsletters here too.

Latest From Consumer Reports

LAPTOP REVIEWS
5 budget-friendy laptops for college students These models provide great features at an affordable price.
LUGGAGE BUYING GUIDE
Safe travels: 4 common hotel scams to avoid Learn how how to dodge being conned when you're on vacation.
WASHING MACHINE REVIEWS
Washer and dryer features you'll want and some to skipVideo The latest machines are loaded with loads of conveniences.
DIGITAL CAMERA REVIEWS
6 kick-butt point-and-shoots that are worth the price If you care about image quality, consider these noteworthy models.
SPORTS CAR REVIEWS
Fast, ferocious M3 and M4 wow on street and track These classy, high-performance BMWs can run with purebred sports cars.
SMART PHONE REVIEWS
First look: Fire Phone puts Amazon in your pocketVideo App choices are limited to Amazon Appstore, which lacks Google offerings.

Connect

and safety with
subscribers and fans

Follow us on:

Cars

Cars New Car Price Report
Find out what the dealers don't want you to know! Get dealer pricing information on a new car with the New Car Price Report.

Order Your Report

Mobile

Mobile Get Ratings on the go and compare
while you shop

Learn more