Test Driving a Used Car: What to Look and Listen For

A test drive is the single most useful part of buying a used car, yet a surprising number of buyers treat it as a quick lap round the block rather than a proper inspection on the move. Photos and a walk round the car in a driveway or forecourt tell you almost nothing about how the engine, gearbox, steering and suspension actually behave once the car is doing 40mph on a real road. Knowing what to check on a used car test drive turns those fifteen minutes into a genuine assessment, and it can save you from buying a car with problems that only show up once you are driving it.

Before you even start the engine

Get into the driver’s seat cold, ideally before the seller has had the chance to warm the engine up beforehand. A car that starts easily from stone cold tells you far more about the battery, starter motor and general health of the engine than one that has already been running for twenty minutes. If the seller says the car “just needs a minute to warm up” or is cagey about letting you do a cold start, treat that as a signal worth investigating rather than dismissing.

Check the dashboard as the ignition is turned on. Every warning light should illuminate briefly and then go out once the engine is running, with the obvious exceptions of the handbrake light while it is applied. Any light that stays on, flickers, or simply does not appear at all (suggesting a bulb has been removed to hide a fault) is worth asking about directly. Note the mileage and compare it with the advert and any paperwork you have already seen, since a mismatch is an immediate red flag.

Listen for the first few seconds after the engine catches. A brief rattle that disappears once oil pressure builds is often normal on higher-mileage engines, but a persistent knocking, ticking or rattling that continues once the engine has settled points toward something worth a mechanic’s opinion. Smoke from the exhaust on start-up is also worth watching for, since blue smoke suggests oil burning and white smoke beyond a cold morning mist can indicate a head gasket problem.

Pulling away and low-speed manoeuvring

The first few hundred yards reveal a great deal. Pull away normally and pay attention to how smoothly power comes in, whether the clutch bites cleanly at a consistent point, and whether the car pulls to one side under gentle acceleration. A clutch that bites right at the top of the pedal travel, or a noticeable judder as it engages, suggests wear that could mean a replacement clutch is not far off, a job that is rarely cheap on most family cars.

Test the steering at low speed in a car park or quiet side street before heading onto faster roads. Turn the wheel from lock to lock and listen for any clunking, whining or grinding, which can point to worn power steering components or driveshaft joints. The steering should feel consistent and centred, without excessive play where you can move the wheel several degrees before anything happens at the front wheels.

Reversing is worth doing properly rather than just glancing in the mirror. Check that reverse engages smoothly without grinding, that any parking sensors or reversing camera work as expected, and that the car tracks straight rather than pulling to one side, which can indicate uneven tyre wear or a steering geometry problem worth investigating further.

Getting up to speed on a real road

Once you are on a road where you can safely reach 40 to 50mph, accelerate through the gears at a normal pace rather than gently coasting. Listen for any change in engine note under load, any hesitation or flat spot as you press the accelerator, and any vibration through the steering wheel or pedals that was not present at idle. A vibration that increases with speed often points toward wheel balancing, but one that changes with engine speed rather than road speed suggests something within the drivetrain itself.

Pay close attention to how the car changes gear. On a manual, each gear should engage cleanly without needing to be forced, and there should be no grinding or resistance moving between gears. On an automatic, changes should be smooth and appropriately timed, without harsh jolts, hesitation, or the revs flaring up before the next gear engages, all of which can be signs of a gearbox needing attention.

Take the car to motorway or dual carriageway speed if the route allows, since some problems only become apparent above 50 or 60mph. Wheel bearing noise, for instance, often only becomes audible at higher speed and tends to change in pitch as you turn the wheel slightly left and right. Wind noise around door seals and general refinement at speed also tell you something about the overall condition and age of rubber seals around the car.

Braking performance and feel

Find a safe, quiet stretch of road and brake reasonably firmly from a moderate speed, checking that the car pulls up in a straight line without pulling to one side, which can indicate uneven brake wear or a sticking caliper. The pedal should feel firm rather than spongy, and there should be no unusual vibration through the pedal or steering wheel under braking, which often points to warped brake discs.

Listen carefully for grinding, squealing or scraping noises when braking, particularly a persistent metallic grinding that suggests the brake pads have worn down to the point where the backing plate is contacting the disc, a situation that means a full brake pad replacement is likely needed soon and possibly discs too. A functioning braking system is not optional, so any doubts here are worth taking seriously and following up with a specialist before agreeing a price.

Test the handbrake on a slight incline if you can find one safely, confirming it holds the car without excessive lever or pedal travel. A handbrake that needs pulling right up before it holds suggests it may need adjustment, and on cars with an electronic parking brake, listen for the motor engaging smoothly rather than struggling or making unusual noises.

Suspension, ride quality and handling

Drive over speed bumps, potholes or uneven road surfaces at a sensible speed and listen for any knocking, clunking or rattling from the suspension. A single sharp clunk over a bump usually points to a specific worn component such as an anti-roll bar link or bush, while a general looseness and excessive body movement suggests worn dampers that are no longer controlling the car’s motion properly.

Take a roundabout or a series of bends at a normal pace and assess how composed the car feels. Excessive body roll, a vague or wandering feeling through the steering, or a sense that the car is not settling quickly after a direction change can all indicate tired suspension components that a visual inspection alone might not catch. This matters for safety as much as comfort, since worn suspension affects how predictably a car behaves in an emergency manoeuvre.

Note how the car rides generally. A firm but controlled ride is normal for many cars, but a ride that feels unusually crashy, bouncy after bumps rather than settling quickly, or noticeably different side to side can point toward specific problems worth having checked by a specialist in the suspension system before you commit to buying.

Unusual noises and what they might mean

A useful habit during any test drive is to turn the radio off and simply listen, since sellers sometimes have music playing that conveniently masks noises a buyer would otherwise notice. Rhythmic clicking noises, particularly when turning, on a front wheel drive car often point toward worn CV joints on the driveshafts, a repair that is straightforward but not free.

A whining or humming noise that changes pitch with road speed rather than engine speed often indicates wheel bearing wear, which tends to get progressively louder and is not something to ignore given its role in keeping the wheel securely located. Squealing that appears only under light braking and disappears under firmer braking is often just brake pad wear indicators doing their job, which is a normal and helpful design feature rather than a fault.

A knocking noise from the engine bay that increases with revs, particularly a deep, heavy knock, is one of the more serious signs to listen for and can indicate significant internal engine wear. If you hear anything like this, it is sensible to stop the test drive and seek an independent opinion rather than continuing, since engine problems of this nature can be extremely expensive to put right.

Electrics, climate control and comfort features

Once safely parked again, work through the electrical features methodically. Test all the windows, both from the driver’s controls and, where fitted, from each individual door. Check the air conditioning blows genuinely cold within a reasonable time and that the heater produces proper warmth, since both systems can be costly to repair if faulty. Try the infotainment system, reversing camera, heated seats and any other features the car is advertised with, confirming they all function as expected.

Check central locking operates correctly on all doors and that the key fob works reliably from a normal distance, since faulty locking systems and worn key fobs are common on older used cars and can be inconvenient and costly to sort out. Test any driver assistance systems fitted, such as parking sensors, lane keeping assistance or cruise control, since these increasingly form part of a car’s expected functionality and any faults here are worth factoring into your offer.

Pay attention to smells inside the cabin too. A musty or damp smell can indicate a water leak that has allowed moisture into the carpets, sometimes from a blocked sunroof drain or perished door seal, and this is worth investigating before it leads to electrical problems or corrosion underneath the carpets.

What a mechanic checks that you cannot

Even the most thorough test drive cannot replace a proper inspection with the car on a ramp. A mechanic can check the condition of the exhaust and underbody for corrosion, inspect brake pad and disc thickness precisely rather than by ear, check for fluid leaks that are not visible from the driver’s seat, and use diagnostic equipment to check for stored fault codes that may not have triggered a warning light yet.

A specialist inspection can also assess tyre condition and remaining tread depth accurately, check suspension components for play using proper tools rather than road feel alone, and verify that the service history matches the work that has actually been carried out on the car. This combination of what you notice on the drive and what a mechanic finds on the ramp gives a much more complete picture than either on its own.

• Start the car cold and check every warning light behaves correctly
• Listen for unusual noises with the radio off, at both low and higher speed
• Test brakes, steering and suspension over a mix of road surfaces
• Check every electrical feature, not just the ones you expect to use daily
• Arrange an independent inspection before finalising the purchase

What happens if you skip this step

Buyers who skip a proper test drive, or who only manage a short, cautious lap around the seller’s street, often discover problems within days or weeks of taking ownership. By this point, resolving the issue with the seller becomes far harder, particularly with a private sale where consumer protections are much more limited than buying from a dealer. A worn clutch, a failing wheel bearing or tired suspension that would have been obvious on a proper test drive can end up costing hundreds of pounds to fix almost immediately after purchase.

Taking the time to test drive a car properly, and following it up with an independent pre-purchase inspection, is a small investment of time and money set against the cost of buying a car with hidden problems. It also gives you genuine negotiating leverage if issues are found, since a specific, documented fault is a far stronger basis for a lower offer than a vague feeling that something was not quite right.

Source: RAC: test drive checklist