Lexus Rx300 MOT Failures
An analysis of 117,732 real DVSA MOT tests on the Lexus Rx300 — what fails, how often, and how that compares to every other car on UK roads. Generations covered: XU10 (1997–2008).
Where the Lexus Rx300 fails its MOT
The single biggest MOT failure point on the Lexus Rx300 is parking brake efficiency below minimum requirement — this model is 52 times more likely to fail on this item than the average car on UK roads. That makes it a major concern for anyone buying or owning this model. Across 117,732 MOT tests, 1.15% of all Lexus Rx300 tests recorded this as a failure.
Brake failures on the MOT range from worn pads and discs (routine maintenance) to corroded brake lines and seized calipers (more serious). Check for any pulling under braking and listen for grinding.
Other notable weak points include suspension component damaged or corroded (45x the fleet average), parking brake efficiency less than 50% of the r... (36x the fleet average), power steering fault (35x the fleet average), and structural corrosion (9.9x the fleet average). These ratios compare the Lexus Rx300's failure rate on each item against the national average for all cars tested — a ratio of 10x means this model fails ten times more often than a typical car.
The failures span 4 categories: Brakes, Suspension, Steering, Bodywork. If you're inspecting a Lexus Rx300 before purchase, these are the areas to focus on — and if any have been flagged as advisories on a previous MOT, they're likely to become failures in the near future.
How failures change with mileage
The Lexus Rx300's weak points shift as the car covers more miles. Understanding these patterns helps you know what to expect — and what to budget for — at each stage of ownership.
Under 60,000 miles
At this mileage, most failures are either design-related or caused by age rather than wear. Components like bushes and drop links may not have been replaced yet, and original-fit parts can deteriorate even on low-mileage cars that spend a lot of time sitting.
For the Lexus Rx300 specifically, the DVSA data shows the most common failures at this mileage are suspension component damaged or corroded (45x the average) and headlight fault (9.9x). suspension joint dust cover severely deteriorated (8.9x) and suspension pin, bush or joint worn (8.6x) also appear frequently.
60,000 to 100,000 miles
This is where routine wear items start to show up. Brake components, tyres, and exhaust parts have done serious work by this point. Cars that have been well serviced will show fewer of these failures — this mileage band is where good maintenance really separates the well-kept from the neglected.
For the Lexus Rx300 specifically, the DVSA data shows the most common failures at this mileage are parking brake efficiency below minimum requirement (52x the average) and parking brake efficiency less than 50% of the r... (36x). power steering fault (35x) and suspension joint dust cover severely deteriorated (11x) also appear frequently.
Over 100,000 miles
High-mileage cars accumulate failures across multiple systems. The key question isn't whether things will need doing — they will — but whether the car has been maintained well enough to keep on top of them. Look for a consistent service history and recent MOT passes with minimal advisories.
For the Lexus Rx300 specifically, the DVSA data shows the most common failures at this mileage are fluid leak (96x the average) and suspension ball joints worn (38x). fuel pipe or hose damaged (29x) and front or rear fog lamp not securely attached (23x) also appear frequently.
The shift from suspension component damaged or corroded at lower mileages to fluid leak at higher mileages is typical — early failures tend to be design or factory-related, while high-mileage failures reflect accumulated mechanical wear. A car that's been well maintained will usually dodge the worst of both.
Known issues beyond the MOT
An MOT only tests roadworthiness at a single point in time — it won't catch developing faults, intermittent problems, or issues that haven't yet reached the failure threshold. These are the issues that Lexus Rx300 specialists and owners flag most frequently, drawn from manufacturer technical bulletins, workshop data, and verified owner reports.
Rear subframe structural corrosion (XU10) Dangerous
The rear subframe assembly on first-generation RX300s suffers from internal corrosion that compromises structural integrity. Affects XU10; typical independent garage repair cost is £800–£2,000.
Suspension component structural damage (XU10) Dangerous
The RX300 suffers from severe corrosion around suspension mounting areas, with MOT failures occurring at 38 times the fleet average for suspension component damage or corrosion. Affects XU10; typical independent garage repair cost is £600–£2,500.
Power steering system failure (XU10) Major
The hydraulic power steering system on the RX300 experiences fluid leaks and pump failures at 34.7 times the fleet average, particularly between 80,000-100,000 miles. Affects XU10; typical independent garage repair cost is £300–£800.
Handbrake efficiency deterioration (XU10) Major
The RX300 suffers from handbrake system deterioration, with MOT failures for inadequate parking brake efficiency occurring at 30 times the fleet average. Affects XU10; typical independent garage repair cost is £150–£350.
For the complete picture — including repair costs across independent, specialist, and dealer garages — see the full Lexus Rx300 common problems breakdown.
What to check before buying a Lexus Rx300
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a Lexus Rx300:
Brakes — check for parking brake efficiency below minimum requirement, parking brake efficiency less than 50% of the r.... Suspension — check for suspension component damaged or corroded, fluid leak, suspension ball joints worn. Steering — check for power steering fault.
Beyond the MOT items, ask specifically about rear subframe structural corrosion and suspension component structural damage. These won't show up on a standard MOT but can be expensive to fix — repairs start from £800. A specialist pre-purchase inspection is worth the investment on this model.
Always check the car's full MOT history for patterns — recurring advisories often become failures within 12 months. And verify the service history to confirm maintenance has been kept up to schedule. Enter any reg into our free car check to see the complete picture.
Looking at a specific Lexus Rx300?
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Lexus Rx300 MOT FAQs
What are the most common MOT failures on a Lexus Rx300?
Based on 117,732 DVSA MOT tests, the most common failure is parking brake efficiency below minimum requirement — at 52x the national fleet average. Other frequent failures include suspension component damaged or corroded and parking brake efficiency less than 50% of the r....
Is the Lexus Rx300 reliable based on MOT data?
The Lexus Rx300 has 15 MOT failure categories above the fleet average. Specialists also flag rear subframe structural corrosion as a concern. A pre-purchase inspection and service history check are recommended.
What MOT failures should I expect at high mileage?
Above 100,000 miles, the Lexus Rx300 most commonly fails on fluid leak and suspension ball joints worn. Under 60,000 miles, the main issues are suspension component damaged or corroded and headlight fault.
How do I check a Lexus Rx300's MOT history?
Enter the registration number into our free car check above. You'll see every MOT test result, advisories and failures, mileage readings, write-off status, and finance checks.
MOT failure data sourced from DVSA bulk test records via data.gov.uk. Ratios compare this model's failure rate against the national fleet average. Known issues sourced from manufacturer bulletins, specialist workshops, and verified owner reports.