MOT advisory explained
“Wheel bearing has slight play”
The only advisory on your certificate with a test you can run yourself, at speed, in under a minute. If the hum changes as you steer, it is the bearing. If it ignores the steering, it never was.
The bearing that lets the wheel spin has developed movement. The tester found it by rocking the wheel top-to-bottom with the car raised, and judged the play measurable but within limits — which is why the car passed.
Bearings do not recover and they get louder as they go. This is one of the few advisories that announces itself, so you will know when it moves on.
Per corner, fitted. On many modern cars the bearing comes as a complete hub assembly, which costs more in parts but less in labour than pressing a bearing out.
A hum is not proof. Tyres produce a very similar noise for a fraction of the price, and the difference between them is a test you can do on the way home — see below before agreeing to anything.
A “wheel bearing has slight play” advisory means the bearing that lets the wheel spin has developed movement that is measurable but still within MOT limits, so the car passes. Replacing one costs £120–£300 fitted. Of 2.3 million tracked axle and bearing advisories, 6.5% later returned as a failure.
What the tester actually did
A wheel bearing is a sealed ring of hardened steel balls or rollers sitting between the hub and the stub axle. It carries the entire weight of that corner while letting the wheel turn freely, and it does that for tens of thousands of miles without any attention at all.
The check is mechanical and takes seconds. With the wheel off the ground, the tester grips it at twelve and six o’clock and rocks it. Movement felt there, with no steering component involved, is bearing play. Movement felt at nine and three o’clock points instead at the steering joints or a suspension arm, which is a different defect and a different bill.
They also spin the wheel and listen. A healthy bearing is silent and smooth. One that is going feels gritty through the fingertips or produces a faint rumble as it turns — that is the rolling surfaces no longer being smooth, which is exactly what the play is a symptom of.
Bearings fail from contamination or shock, not from mileage alone. A seal that lets water in, a heavy kerb strike, a pothole taken at speed, or years of salt spray. That is why one corner can go at eighty thousand miles while the other three are untouched at a hundred and fifty.
The test you can run yourself
This is the only advisory in the entire test that comes with a road test the owner can perform, and it settles the single most expensive misdiagnosis on the list: bearing or tyres.
- Find a quiet stretch and get to a steady forty to fifty. You want a constant speed and no traffic beside you. The noise you are listening for is a hum or drone that rises and falls with road speed rather than engine speed.
- Swing gently left, then gently right. Not a lane change — a long, shallow curve in each direction, the kind that loads one side of the car and unloads the other. Do each one for a few seconds.
- Listen for the noise changing. Swinging left loads the right-hand wheels. If the hum gets louder swinging left, the failing bearing is on the right; louder swinging right means it is on the left. A bearing under load rumbles harder, and that asymmetry is the whole diagnosis.
- If the noise ignores the steering entirely, it is not the bearing. A hum that stays exactly the same through both swings is almost always tyres — uneven or cupped wear producing a drone that sounds identical from the driver’s seat but costs a great deal less to fix.
This is a different kind of self-check from the one on a worn tyre. There you inspect a condition, standing still, with a coin. Here you run a test, in motion, and the answer is behaviour rather than measurement. There is more on separating the two in our guide to a humming noise when driving.
One honest caveat. If bearings on both sides of the same axle are worn, the noise can stay level through both swings and mimic tyres. It is uncommon, but it is the reason this test tells you a great deal and not everything.
When it stops being an advisory
Excessive play fails. The manual separates a bearing with slight play, which is an advisory, from one with excessive play or one that is clearly on the way out, which is a major defect. As with most of the suspension section, excessive is the tester’s judgement against the manual rather than a published figure you can measure at home.
Roughness on its own can fail it too. A bearing that grinds or rumbles audibly when spun is failing regardless of how much play it has, because the rolling surfaces have broken down. Play and noise are two symptoms of the same decay and either can cross the line first.
What makes this one worth acting on is what it takes with it. A bearing that seizes or breaks up does not fail quietly: it can damage the hub, the stub axle and the ABS sensor ring that sits on many modern hubs, and at worst the wheel can come loose. A £120–£300 job becomes several times that once the hub is scrap.
The ABS light is a common companion. On cars where the sensor ring is part of the bearing, a failing bearing throws an ABS fault before anything else gives way — so an ABS warning alongside a hum at that corner is not two problems, it is one.
How often does this advisory become a failure?
This can be measured rather than guessed. Following every axle and bearing advisory forward to the same vehicle’s later tests, across 2.3 million of them, shows what actually happened.
| What happened next | Axles and bearings | Suspension | Tyres |
|---|---|---|---|
| Became a failure at a later test | 6.5% | 18.7% | 9.9% |
| Ignored, no action taken | 23.8% | 37.1% | 30.5% |
| Fixed | 69.7% | 44.2% | 59.6% |
| Median advisory to failure | 378 days — the next MOT | ||
From the DVSA MOT testing bulk dataset (Open Government Licence v3.0): 829.7 million tests and 145.1 million advisories tracked to each vehicle’s later tests, from 2,301,888 axle and bearing advisories. Defect code 5.1 covers axles and bearings as a group, not wheel bearings alone.
Seven in ten of these get fixed — the highest rate of any advisory group we can measure, and fewer than a quarter are left alone. Set beside a corroded spring, where fewer than half get dealt with, that gap is worth more than either number on its own.
A wheel bearing and a corroded coil spring sit in the same section of the test, cost broadly similar money, and are both jobs an owner can postpone. Bearings are repaired 69.7% of the time. Springs, 44.2% — the lowest figure in the record.
The difference is not price and it is not danger. It is that a bearing hums, and the hum gets louder every week. A corroded spring makes no sound at all, lights no lamp, and drives exactly as it did the day before it snaps. Owners are not weighing risk against cost. They are responding to what the car tells them, and the car only tells them about some faults.
Which is the useful way to read every figure in this section: a high fix rate means the fault was noticeable, not that it was serious.
How the risk changes with the age of the car
Because the record covers two decades, it is possible to break the same figure down by how old the car was when the advisory was written — and bearings behave differently at ten years than at two.
| Age of car at the advisory | Advisories | Became a failure |
|---|---|---|
| 2 years | 9,884 | 3.0% |
| 5 years | 58,252 | 4.9% |
| 10 years | 149,270 | 6.5% |
| 15 years | 159,026 | 7.5% |
| 20 years | 55,832 | 6.6% |
| 25 years | 17,634 | 5.6% |
Same dataset, broken down by vehicle age at the time of the advisory. Contains public sector information licensed under the Open Government Licence v3.0.
The risk more than doubles between a two-year-old car and a fifteen-year-old one. On a nearly new car an advisory here is usually a bearing that was unlucky — a pothole, a bad seal — and it often gets dealt with under warranty or at the next service before it goes anywhere. On a car in its teens, the same words describe a component that has done its full life in British weather, and it converts at two and a half times the rate.
After fifteen years the rate falls again, and that is not the bearings improving. Cars that reach twenty and twenty-five years on the road are survivors: either cared for by owners who fix things, or driven so little that nothing wears. The population changes, so the statistic changes with it. Read the top of that curve as the honest number for an ordinary older car.
What it costs
| Job | Price fitted | Notes |
|---|---|---|
| Wheel bearing, one corner | £120–£300 | The usual job, front or rear |
| Complete hub assembly | Higher parts, lower labour | How many modern cars are built |
| Pressed-in bearing | Lower parts, higher labour | Needs a press or a hub off the car |
| Alignment afterwards | Not usually needed | A bearing does not set geometry |
Independent garage prices, parts and labour. Main dealers typically charge around 50% more. Component prices from the suspension repair cost page.
The pressed-versus-hub question decides where in the range you land, and it is fixed by how your car was designed rather than by the garage. A complete hub assembly costs more as a part but bolts on; a pressed-in bearing is cheaper to buy and needs the hub carrier off the car and into a press. Ask which yours is before comparing quotes, because the two are not the same job.
Bearings do not need doing in pairs. Unlike springs or dampers, they do not have to match across an axle, and they fail from individual events rather than shared wear. One flagged bearing is one bearing — a quote for both sides deserves the question of what the other one measured.
No alignment is needed afterwards on most cars, because a bearing carries the wheel rather than positioning it. That is a genuine difference from nearly every other repair in this section, and it is worth knowing if an alignment appears on the quote without explanation.
Waiting is the expensive option here, not the cheap one. A bearing left long enough can pick up the hub, the stub axle and the ABS ring on its way out, and those turn a straightforward job into a much larger one.
| Worked example — one front bearing, family hatchback | |
|---|---|
| Hub assembly with bearing, quality aftermarket | £55 |
| Labour — 1.5 h × £65 | £98 |
| Typical total, one corner | ≈ £153 |
Sits in the lower half of the £120–£300 range. A pressed-in bearing on a car that needs the hub carrier removed pushes the labour up and the total towards the top of it.
Enter your reg — we’ll read your MOT history, decode each advisory and price it for your exact model.
What to do next
- Run the swing test on the way home. Forty to fifty, a long curve each way, and listen for the hum changing. It costs nothing and it separates a bearing from a set of tyres before anyone quotes you for either.
- Ask which corner and which type. Pressed-in bearing or complete hub is the question that explains the whole price range, and it is decided by the car rather than the garage.
- Act while it is still a hum. This advisory gives you warning that most do not — the noise gets steadily louder. Once it becomes a growl or a grinding, the hub is at risk and the job stops being a small one.
- Mention it if the ABS light has been on. On many cars the sensor ring lives on the bearing, so the two faults are one fault, and saying so saves a diagnostic charge.
Wheel bearing advisory FAQ
What does a worn wheel bearing sound like?
A hum, drone or rumble that rises and falls with road speed rather than engine speed, and which gets louder over weeks. The distinguishing feature is that it changes when you steer: loading the bearing by swinging gently towards the other side makes it rumble harder. A noise that ignores the steering is almost always tyres.
How do I tell a wheel bearing from tyre noise?
Drive at a steady forty to fifty and swing gently left, then gently right. Swinging left loads the right-hand wheels, so a hum that grows swinging left points at a bearing on the right, and vice versa. If the noise stays identical through both swings, it is tyres. The one exception is worn bearings on both sides of an axle, which can mask the difference.
Is it safe to drive with wheel bearing play?
At the advisory stage the tester judged the play within limits, which is why the car passed. Bearings do not recover though, and a badly failed one can damage the hub and stub axle or, at worst, let the wheel become loose. The practical rule is to act while it is still a hum rather than a growl.
How much does a wheel bearing cost to replace in the UK?
£120–£300 per corner fitted at an independent garage, with main dealers typically charging around 50% more. Where the bearing comes as a complete hub assembly the part costs more but bolts on; a pressed-in bearing is cheaper to buy but needs the hub carrier removed and pressed, which puts the labour up.
Do wheel bearings need replacing in pairs?
No. Unlike springs and dampers they do not have to be matched across an axle, and they fail from individual events — a pothole, a failed seal — rather than shared wear. One flagged bearing is one bearing, so a quote covering both sides deserves the question of what the other one actually measured.
Can a wheel bearing cause the ABS light to come on?
Yes, and it is common. On many modern cars the ABS sensor ring is built into the bearing, so a failing bearing disturbs the signal and triggers the warning before anything else gives way. An ABS light alongside a hum at the same corner is usually one fault rather than two.
What causes a wheel bearing to fail?
Contamination and shock rather than mileage. A seal that lets water or grit past, a heavy kerb strike, a pothole hit at speed, or years of salt spray. That is why one corner can fail at eighty thousand miles while the other three are perfectly sound at twice that.
How often does a wheel bearing advisory become an MOT failure?
Across 2.3 million tracked axle and bearing advisories, 6.5% returned as a failure at a later test, 69.7% were fixed and 23.8% were ignored — the highest repair rate of any group in the record. The risk also climbs with the age of the car, from around 3% on a two-year-old to 7.5% on a fifteen-year-old.