You’ve found a used car at a reasonable price. The mileage looks good, the seller seems genuine, and the vehicle has a valid MOT. Then you check its MOT history and discover several advisories.
Should you still buy it?
The answer depends on what those warnings actually mean and how much they may cost to resolve.
MOT advisories highlight problems or developing deterioration that may need attention. They do not automatically cause a vehicle to fail its MOT, but some can indicate expensive repairs ahead.
For example, a note about worn tyres could mean budgeting for replacements soon. A warning about corrosion around important structural areas may deserve a much more thorough inspection.
The important skill is separating routine maintenance from problems that could make the vehicle a poor purchase.
This guide explains how to interpret common advisory wording, estimate UK repair costs, examine MOT history, negotiate with sellers, and recognise when a cheaper car could become an expensive mistake.
What Are MOT Advisories On a Car?
An MOT advisory is information recorded by the tester about an issue that may require monitoring or future attention.
It often concerns a component showing wear or deterioration that has not reached the relevant failure threshold.
A car can pass its MOT with advisories.
However, an advisory does not guarantee that the problem will remain minor until the next test.
Vehicle condition can change with mileage, driving conditions, and time.
The MOT system also distinguishes advisories from formally graded minor, major, and dangerous defects.
Under the DVSA’s system, minor defects do not cause a failure, while major and dangerous defects do.
The current DVSA MOT inspection manual explains how testers record defect grades and advisory information.
Does a Car With Advisories Have a Valid MOT?
Yes, provided the vehicle passed the test and its certificate remains valid.
An advisory does not automatically invalidate the certificate.
However, the vehicle must remain roadworthy throughout its use.
A valid MOT does not make an unsafe car lawful to drive.
If a problem has deteriorated significantly since the test, it may require immediate attention regardless of what the earlier certificate says.
Are MOT Advisories a Red Flag When Buying a Used Car?
Not every advisory should stop you from buying.
A ten-year-old car with normal wear may reasonably have maintenance items approaching replacement.
What matters is the type of problem, its history, the seller’s response, and whether the asking price reflects the likely expenditure.
A useful way to assess advisories is to divide them into three groups.
- Routine Maintenance Concerns
Tyres approaching replacement, an ageing wiper blade, or other straightforward wear items may be manageable when the car is otherwise sound.
- Potentially Expensive Developing Problems
Suspension wear, corrosion, or recurring brake advisories may require a professional inspection and a written cost estimate.
- Concerns Requiring Extra Caution
Significant structural deterioration, repeated unresolved failures, or symptoms of unsafe handling deserve careful investigation before purchase.
These groups are practical buying categories, not official MOT defect grades.
An advisory’s actual severity should always be established from the recorded wording and current vehicle condition.
MOT Advisories Repair Cost UK: What Could You Pay?
The table below provides indicative UK costs for common work that may be associated with MOT advisories.
Prices vary by vehicle, location, specification, labour rates, and the exact repair required.
| Advisory-Related Work | Indicative UK Cost |
| Budget tyre replacement | £45–£70 per tyre |
| Mid-range tyre replacement | £75–£120 per tyre |
| Brake pad replacement | £100–£300 per axle |
| Brake pads and discs | £200–£500 per axle |
| Suspension bush replacement | £100–£250 per repair |
| Lower suspension arm replacement | £120–£350 per arm |
| Front coil springs | £175–£400 per pair |
| Rear coil springs | £125–£300 per pair |
| Wheel alignment | Around £80–£90 |
| Typical exhaust repair | Around £135 average |
| Small windscreen chip repair | Generally below £100 |
| Windscreen replacement | Around £150–£500 |
| Small automotive welding repair | From approximately £125 |
| Sill welding | Around £300 |
| Complex chassis welding | Around £1,000 |
These are guide figures drawn from published 2026 UK cost data, including RAC and Checkatrade. They are not guaranteed quotations. Some work may involve additional parts, diagnosis, or specialist procedures.
The correct way to budget is to identify the exact fault and get a vehicle-specific estimate.
An advisory alone is not a complete diagnosis.
Tyre Advisories: How Much Should You Budget?
Tyre warnings are among the easiest advisory items for buyers to understand, but they should not be dismissed.
A tester may note that a tyre is wearing or approaching the minimum tread requirement.
For most passenger cars, the legal minimum is 1.6mm across the central three-quarters of the tread and around the entire circumference.
A tyre can be above that limit at the time of the MOT but require replacement before the next annual test.
How Much Does Replacing a Tyre Cost?
For many ordinary cars, budget tyres may cost around £45 to £70 each.
Mid-range tyres commonly cost around £75 to £120 each, according to published UK guide prices.
Larger wheels, specialist sizes, and performance tyres can cost considerably more.
Also check whether the quoted price includes fitting, balancing, valves, and disposal.
Do not compare tyre prices using the tyre cost alone when additional services are charged separately.
What If Two Or Four Tyres Need Replacing?
The total can quickly become significant.
Consider a vehicle needing four mid-range tyres at an illustrative £100 each.
That means approximately £400 before any separately charged services.
A car advertised at £4,000 may therefore require an immediate tyre budget approaching 10% of its asking price.
That does not automatically make it a bad purchase.
It means the buyer should account for the expense before agreeing to the price.
What Does Uneven Tyre Wear Mean?
Uneven wear deserves more attention than ordinary gradual wear.
It may be associated with incorrect inflation, wheel alignment, suspension problems, or other mechanical conditions.
Replacing the tyre without investigating the cause may result in the new tyre wearing unevenly too.
Ask a garage whether the problem requires an alignment check or further mechanical inspection.
The cost of alignment is separate from replacing damaged tyres.
Brake Advisories: When Do Costs Increase?
Brake-related advisories can concern worn friction components, deterioration, or other developing issues.
The wording matters.
A note about surface corrosion on a brake disc may have different implications from excessive wear or deterioration affecting braking performance.
Do not assume every advisory means the same repair.
Brake Pads Wearing Thin
Brake pads gradually wear through use.
A warning about worn pads may indicate that replacement will be necessary.
RAC quotes approximately £100 to £300 per axle for brake pad replacement, depending on the vehicle and work involved.
Ask the seller whether the pads have already been replaced.
If they have, request the invoice.
An undocumented statement that the brakes were “sorted” provides less reassurance than an itemised repair record.
Brake Discs Worn Or Corroded
Brake discs may also need attention.
If both pads and discs require replacement, the total will usually be higher.
RAC provides a guide of around £200 to £500 per axle for replacing pads and discs, depending on the vehicle.
A car with brake warnings on both axles could therefore need a substantial budget.
However, the advisory should be inspected before assuming complete replacement is necessary.
Can Brake Advisories Be Ignored?
No.
They should be assessed according to the actual condition and risk.
A developing brake problem may become more serious between MOT tests.
If braking performance is affected or the vehicle appears unsafe, do not continue driving it merely because the previous MOT result was a pass.
Suspension Advisories: Cheap Wear Or Expensive Repairs?
Suspension-related warnings can be difficult for used-car buyers to interpret.
The suspension system includes several components, and a general description does not always establish what must be replaced.
A warning about deterioration in a rubber bush may lead to a different repair from one involving a suspension arm or spring.
Worn Suspension Bushes
Bushes help manage movement between suspension components.
They can deteriorate with age and use.
A published UK guide places suspension bush replacement around £100 to £250 per repair.
However, accessibility and suspension design affect the final cost.
Some repairs may involve replacing a larger assembly rather than an individual bush.
Ask the garage what is actually required for the model you are considering.
Suspension Arms and Joints
A damaged or worn suspension arm may require replacement.
Published guide prices for a lower suspension arm are approximately £120 to £350 per arm.
More complex suspension systems may cost more.
A single advisory may also indicate a developing problem affecting other components.
For that reason, a professional pre-purchase inspection is valuable when suspension warnings appear repeatedly.
Coil Spring Deterioration
A spring advisory should be examined carefully.
A spring showing deterioration may eventually require replacement.
A fractured or seriously weakened spring can result in an MOT failure.
UK guide costs for replacing a pair of front springs are around £175 to £400, while a rear pair may cost around £125 to £300.
The exact amount depends on vehicle design, parts, and labour.
Why Repeated Suspension Advisories Matter
Imagine a vehicle receives an advisory about suspension wear in 2024.
The same component is mentioned again in 2025.
It appears once more in 2026.
That pattern suggests the issue may not have been resolved.
However, it does not establish the current severity.
Ask for repair evidence and a fresh inspection.
Repeated warnings should prompt further questions, not an automatic assumption that the seller has concealed something.
Corrosion Advisories: When Should You Be Concerned?
Corrosion can be one of the most financially significant types of MOT advisory.
The key issue is where the rust is located.
Minor surface corrosion may be manageable.
Deterioration affecting a load-bearing structure or an important mounting area can require much more extensive work.
An MOT tester may record corrosion before it reaches the applicable failure criteria.
That warning is valuable because the problem may become more serious over time.
Surface Rust Vs Structural Corrosion
Surface rust may be present on components exposed to the weather.
It does not always mean the vehicle’s structural strength is compromised.
Structural corrosion deserves closer attention.
Affected areas may include sills, floor sections, supporting structures, or areas near important mechanical mountings.
The vehicle’s design and the exact location determine the significance.
A professional inspection should establish how much metal has deteriorated and whether a suitable repair is possible.
How Much Does Rust Repair Cost?
Published UK guide prices suggest that a small automotive welding repair may start at approximately £125.
A sill repair may cost around £300.
Complex chassis welding can cost around £1,000, with more extensive work potentially costing significantly more.
These are examples, not a reliable estimate for every corrosion advisory.
Hidden damage may only become visible after further inspection.
Not every structural component should be welded, and repairs must follow appropriate requirements.
When Should You Walk Away From a Rusty Used Car?
Consider walking away when the seller refuses an independent inspection, the structure shows extensive deterioration, or the necessary repair cannot be established reliably.
Multiple corrosion advisories affecting important areas should also raise the level of scrutiny.
A low asking price does not make a structurally unsafe vehicle a good purchase.
For an older low-value car, extensive corrosion work may cost more than the vehicle would be worth after repair.
Exhaust Advisories: What Could Be Wrong?
Exhaust advisories may involve deterioration, corrosion, mounting problems, or other developing issues.
The repair cost depends on the affected component.
A minor repair to a conventional exhaust section can be relatively affordable.
However, repairs involving emissions-control components may be much more expensive.
RAC reported an average exhaust repair cost of approximately £135 using UK repair data from August 2026.
That figure should not be applied automatically to catalytic converters, diesel particulate filters, or other complex emissions components.
What Questions Should You Ask the Seller?
Ask which section of the exhaust was affected.
Check whether the problem has been repaired since the MOT.
Request supporting invoices.
If the car has an engine warning light or suspected emissions problem, obtain professional diagnosis.
A general exhaust advisory should not be used to assume that the emissions system is functioning correctly.
Windscreen Advisories: Minor Chip Or Major Expense?
Windscreen damage may be straightforward to repair, but position and severity matter.
A small chip in an appropriate area may be repairable.
A larger crack or damage affecting visibility may require replacement.
RAC indicates that many small repairs cost less than £100, while replacement can cost approximately £150 to £500 for many vehicles.
Some premium vehicles or advanced systems may cost more.
Why Modern Windscreens Can Be Expensive
Some cars have cameras and driver-assistance equipment associated with the windscreen.
Replacement may require additional work to ensure the systems operate correctly.
The glass itself may also be more expensive because of heating elements, acoustic properties, or other features.
Before buying a car with windscreen damage, ask whether the repair is appropriate or whether replacement is required.
Your insurance policy may also provide windscreen cover, depending on its terms.
Do not assume the seller’s estimate applies to your chosen insurer or vehicle specification.
How To Check a Used Car’s MOT Advisory History
A current MOT pass provides only part of the vehicle’s story.
The historical record can reveal previous failures, recurring concerns, and recorded mileage.
The UK government provides a free online MOT history service.
You need the vehicle’s registration number.
Before buying, visit the official MOT history checker to review the available results.
Read More Than the Latest Test
Check several years of results.
Look for patterns rather than focusing only on the number of advisories.
For example, a car might have four advisories in one year, followed by none the next year.
This could indicate that repairs were completed.
However, you should still request invoices or other evidence.
A clean result does not automatically prove that every previous issue was repaired.
Compare the Mileage Records
MOT history can help you review recorded mileage over time.
Look for unusual discrepancies or changes.
Some differences may result from administrative errors.
Others may require further investigation.
If the recorded mileage conflicts with the seller’s explanation, clarify the issue before buying.
Check Previous MOT Failures
A vehicle may have passed its latest test after failing an earlier one.
That is not automatically a problem.
Many cars fail for repairable faults and subsequently pass after appropriate work.
The important question is what caused the failure and whether the relevant work was completed properly.
Ask the seller for documentation.
For significant safety-related defects, consider an independent mechanical inspection.
How Many MOT Advisories Are Too Many?
There is no official maximum number of advisories that makes a car unsuitable for purchase.
One serious developing problem can matter more than several minor wear items.
For example, a vehicle with three straightforward maintenance advisories may be a better purchase than one with a single warning about corrosion near a critical structural area.
The number alone is not enough.
You need to consider:
- The type of component affected
- The recorded wording
- Whether the problem is recurring
- The estimated repair cost
- The vehicle’s current condition
- The seller’s maintenance evidence
- Whether the asking price reflects the required work
A vehicle with several advisories can still be worth buying if the problems are understood and the price is appropriate.
Equally, one advisory may justify walking away if the potential repair risk is too high.
Should You Buy a Car With Repeated MOT Advisories?
Repeated advisories are a reason to investigate.
They may indicate unresolved wear, insufficient maintenance, or continuing deterioration.
However, the records do not always tell the complete story.
An advisory can be worded differently by different testers.
A previous problem may have been repaired, while a similar issue later developed on another component.
Look at the precise location and wording.
For example, repeated warnings concerning the same side of the suspension deserve closer attention than unrelated advisories concerning different wear items.
Request repair documentation and use an independent inspection to establish the current condition.
How To Negotiate the Price Of a Car With MOT Advisories
A good negotiation is based on evidence.
Instead of simply telling the seller that the vehicle has too many advisories, explain what the required work may cost.
Obtain written quotations where possible.
The negotiation should reflect the total expenditure likely to be necessary after purchase.
Example: a Used Ford Fiesta With Maintenance Warnings
Imagine a Ford Fiesta is advertised for £4,800.
Its MOT history shows advisories for two worn tyres and deteriorating front brake pads.
A garage estimates the following work:
| Item | Illustrative Amount |
| Two replacement tyres | £190 |
| Front brake pads | £140 |
| Total estimated work | £330 |
These amounts are hypothetical vehicle-specific quotations for the example, not universal repair prices.
You could use the £330 estimate as a starting point for discussing the asking price.
The seller might agree to complete the repairs or reduce the price.
A discount is not guaranteed, but a documented estimate provides a reasonable basis for the conversation.
Example: an Older BMW With Multiple Warnings
Now imagine an older BMW advertised for £3,200.
Its history includes suspension deterioration, corrosion warnings, and uneven tyre wear.
Further inspection suggests several repairs may be required.
The estimated total is £1,500.
That is a substantial proportion of the asking price.
You should consider whether the car remains financially attractive after the work.
You also need to account for other upcoming maintenance and the possibility of hidden deterioration.
Sometimes the best negotiation is deciding not to buy.
Why a Pre-Purchase Inspection Can Save Money
A professional inspection can help establish the current condition of a vehicle.
This is especially valuable when the MOT history contains recurring concerns or expensive potential repairs.
An inspection should be proportionate to the vehicle’s value and risk.
For example, a relatively inexpensive car with a history of structural corrosion may justify more careful scrutiny than one with a single routine maintenance item.
An inspector can assess current condition, identify concerns, and recommend additional specialist checks where necessary.
However, no inspection guarantees that a vehicle will never develop faults.
Use the report to reduce uncertainty rather than eliminate it completely.
What Should You Ask the Inspector To Check?
Share the MOT history in advance.
Highlight the specific advisories you are concerned about.
Ask the inspector to assess the current condition of those components.
If the report suggests additional diagnosis is necessary, clarify the potential costs before purchasing.
For corrosion, you may need a suitably experienced structural repair specialist.
For complex electronic problems, further diagnostic work may be appropriate.
MOT Advisories Vs a Failed MOT: Which Is More Serious?
An advisory does not automatically cause a failure.
A major or dangerous defect does.
However, the current roadworthiness of the vehicle matters more than the historical label alone.
A car that passed several months ago may have deteriorated since its test.
Likewise, a car that previously failed may now be in good condition after appropriate repairs.
The most reliable buying decision combines MOT history, maintenance records, a current inspection, and a sensible purchase price.
Do not rely on one source in isolation.
What If Your Own Car Has Too Many MOT Advisories?
The decision is slightly different when you already own the vehicle.
You are comparing the cost of keeping it against the cost of replacement.
A car with manageable maintenance needs may still provide good value.
For example, replacing worn tyres and brake pads may be worthwhile on a reliable car with a sound engine, gearbox, and structure.
However, an older vehicle with repeated expensive problems can become difficult to justify financially.
Consider the total expected expenditure over the next year rather than only the next immediate repair.
If your current car needs substantial work, our guide to deciding whether to sell or scrap your car explains how to compare its remaining value with repair costs.
When Is Scrapping the Better Option?
Scrapping may make sense when the vehicle has multiple expensive problems, severe corrosion, or little realistic market value after repairs.
A car does not need to fail its MOT before being scrapped.
Equally, a car with advisories should not automatically be destroyed.
Get an accurate repair estimate and compare it with the vehicle’s current selling or scrap value.
For motorists in Berkshire, our Scrap My Car in Reading service provides quotations for unwanted and uneconomical vehicles.
Frequently Asked Questions About MOT Advisories
Is It Safe To Buy a Car With MOT Advisories?
It can be, depending on the vehicle’s current condition and the issues recorded. Advisories do not automatically mean the car is unsafe, but they should be reviewed before purchase.
Do MOT Advisories Affect Car Value?
They may. Buyers can use estimated repair costs and maintenance concerns when assessing a vehicle’s value. There is no fixed percentage reduction.
Can MOT Advisories Disappear?
An advisory may not appear on a later test if the issue has been resolved or no longer warrants recording. Previous entries remain visible in the historical record.
Do Advisories Need To Be Fixed Before the Next MOT?
Not every advisory requires immediate replacement, but some issues may become unsafe or reach failure criteria before the next test. Follow professional advice based on the actual condition.
Does a Car Pass With Multiple Advisories?
Yes, provided it meets the applicable MOT requirements and has no recorded major or dangerous defects causing failure.
Should I Avoid a Car With Rust Advisories?
Not automatically. The decision depends on the location and extent of corrosion. Structural deterioration deserves professional inspection before purchase.
Can I Ask a Seller To Repair Advisories Before Purchase?
Yes. You can negotiate for repairs, a price reduction, or other agreed terms. Make sure any promised work is documented and completed appropriately.
Are MOT Advisories Legally Binding Repair Instructions?
An advisory is a warning or recommendation rather than an automatic MOT failure. However, the legal duty to maintain a roadworthy vehicle still applies.
Can a Dealer Sell a Car With MOT Advisories?
A dealer can sell a vehicle with advisories, but the vehicle must be accurately represented and the transaction must comply with applicable consumer protection requirements.
Is It Better To Buy a Car With No Advisories?
A clean MOT history can be reassuring, but it is not proof of perfect condition. Maintenance records, inspections, and the actual state of the vehicle remain important.
Buy the Car, Not Just the MOT Certificate
MOT advisories should influence your buying decision, but they should not control it without context.
Some describe ordinary wear that can be addressed through routine maintenance.
Others identify developing problems that may become expensive or affect safety.
Before buying, read the complete MOT history, check the exact advisory wording, obtain repair estimates, and consider an independent inspection.
Use the information to negotiate a fair price.
If the likely expenditure remains reasonable and the vehicle is sound, buying may be worthwhile.
If history suggests extensive deterioration, substantial repair costs, or significant uncertainty, walking away may protect you from a poor investment.
For owners whose current vehicle has become uneconomical to maintain, Scrap My Car UK offers a way to request a vehicle-specific quotation.
A cheap used car is only a good deal when its purchase price, condition, and likely repair costs make sense together.