Hybrid luxury SUV that never breaks down
The RX 450h is Lexus's flagship hybrid luxury SUV, competing directly with the BMW X5, Audi Q7, and Range Rover Sport on prestige while undercutting them on running costs and reliability. It attracts buyers who want premium comfort and refinement without the maintenance headaches associated with German and British rivals. Strong residuals and bulletproof hybrid reliability make it a shrewd used purchase.
We track 5 known issues across the Lexus Rx450h range, with 1 classified as significant. Knowing which variants and configurations to approach with caution can save you from expensive surprises after purchase.
Found a Lexus Rx450h? Enter the reg to see which of our 5 known issues apply to that exact car, plus full MOT history and mileage checks.
AL10 (2009–2015) — Engine options included the 3.5L V6 Hybrid, 3.5L V6. We track 5 known issues on this generation, with 1 classified as significant. The most significant concern is Brake system warning lights and ABS issues (£200–£600 to address).
AL20 (2015–2022) — Engine options included the 3.5L V6 Hybrid. We track 5 known issues on this generation, with 1 classified as significant. The most significant concern is Brake system warning lights and ABS issues (£200–£600 to address).
NHTSA complaints document multiple cases of ABS, brake, traction control and VSC warning lights illuminating simultaneously, often accompanied by a hard brake pedal and audible warning chimes. This affects the hybrid's regenerative braking integration and can significantly reduce braking performance. The issue appears related to the brake booster or master cylinder in the hybrid braking system which combines conventional and regenerative braking forces.
Brake system faults on hybrid vehicles can disable both conventional and regenerative braking, significantly increasing stopping distances. If multiple brake warning lights are illuminated, the vehicle should not be driven until diagnosed. Emergency braking may still function but at reduced effectiveness.
Check brake disc condition for lipping or scoring. Test braking at moderate speed for pulling to one side or vibration through the steering wheel. Review MOT advisories for brake-related items.
The RX450h shows accelerated wear of suspension bushes and joints, particularly control arm bushes and ball joints. MOT data shows this model fails at 5.4 times the fleet average for suspension pin, bush or joint wear, with failures documented from 20,000 miles onwards. The additional weight of the hybrid battery system (approximately 120kg over the petrol equivalent) places extra stress on suspension components. This affects ride quality and can lead to uneven tyre wear if left unaddressed.
Worn suspension bushes reduce ride comfort and handling precision. If left unrepaired, they can cause accelerated tyre wear and affect vehicle stability during emergency manoeuvres. The car remains safe to drive but should be repaired promptly to prevent more expensive secondary damage.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
MOT data shows the RX450h fails at 3.1 times the fleet average for shock absorber damage or severe leakage, particularly on higher mileage vehicles. The additional weight of the hybrid system places extra demands on the shock absorbers. Leaking dampers reduce ride comfort and vehicle control, particularly during braking and cornering. This is a common wear item but occurs earlier than average on this model.
Worn shock absorbers reduce braking performance, cornering stability, and ride comfort. In severe cases they can cause loss of tyre contact with the road during heavy braking or emergency manoeuvres. The car remains legal to drive but handling and safety margins are compromised.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
MOT data shows the RX450h fails at 2.2 times the fleet average for wheel bearing excessive play, typically occurring between 100,000-120,000 miles. The additional weight of the hybrid battery system accelerates wheel bearing wear compared to conventional petrol SUVs. A worn wheel bearing creates noise and can affect wheel alignment and steering feel.
A worn wheel bearing will gradually worsen and can eventually seize, causing loss of wheel control. Early stages cause noise and vibration. The car can be driven short distances but should be repaired promptly as complete bearing failure creates a dangerous situation.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
NHTSA complaints document oil leaks affecting the 3.5L V6 engine used in the RX450h, with valve cover gaskets and timing cover seals being common leak points on higher mileage vehicles. The hybrid system's frequent engine start-stop cycles can accelerate seal degradation. Oil leaks can contaminate spark plugs or cause fire risk if oil contacts hot exhaust components.
Minor oil leaks cause mess and environmental contamination but pose little immediate danger. Larger leaks can cause oil starvation leading to engine damage, or create fire risk if oil contacts exhaust components. Monitor oil levels closely and repair significant leaks promptly.
Check the oil level before the engine is started. Ask the seller how often they top up the oil between services. After a test drive, check the level again and look behind the car for blue or grey exhaust smoke under acceleration.
For the full breakdown of all 5 tracked issues with repair costs, see the Lexus Rx450h common problems page.
Based on 39k real DVSA MOT tests, the Lexus Rx450h fails more often than average on several items. The biggest outlier is front or rear fog lamp not securely attached at 20x the fleet average, followed by suspension joint dust cover severely deteriorated (10x).
When viewing a specific car, check its MOT history for recurring advisories in these categories. See the full Lexus Rx450h MOT failure breakdown for data at every mileage point.
Routine servicing (oil and filter change every 10k miles) typically costs £120–£180 at an independent garage.
See the full Lexus Rx450h service schedule for every interval and cost breakdown.
The Lexus Rx450h is a reasonable used buy provided you check for the issues outlined above. None of the problems we track are insurmountable, but they do reward buyers who inspect thoroughly and verify the service history before committing. The 2018 model year is considered the most reliable in the lineup. The 2020+ facelift brought improved suspension, better infotainment connectivity, and a stiffer body. For budget buyers, 2010-2015 third-generation models are proven and dependable. Avoid 2016-2017 models which had more reported issues including fuel pump and brake assist recalls.
Before committing, check the car's full MOT history, verify the service record is complete, and if possible arrange a specialist inspection. Enter any registration into our free report to see the complete picture.
Get Car Wise maintains a database of known mechanical issues for every popular car on UK roads, tracking the faults that owners, specialists and DVSA data reveal.
When you run a report on a specific Lexus Rx450h, we cross-reference the exact variant, engine and age against our database of 5 known issues. Combined with full MOT history analysis, mileage verification and DVLA data, you get a complete picture before viewing.
Enter the registration for MOT history, mileage verification, known faults for that exact variant, and a Get Car Wise Score.
This guide was compiled from independent expert reviews, DVSA MOT data, specialist workshops and our own database of 5 known Lexus Rx450h issues. We are not affiliated with any source listed.