Generations
XU10 — First Generation
1997–2008
3.0L V6
Top issues to watch for
The most serious Lexus Rx300 problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Dangerous
Rear subframe structural corrosion (XU10)
The rear subframe assembly on first-generation RX300s suffers from internal corrosion that compromises structural integrity. The subframe carries the rear suspension mounting points and differential, making failure a direct safety risk. Later Toyota SUVs use different subframe materials and coatings that are not subject to this failure pattern.
What happens if ignoredSubframe failure can cause sudden loss of rear suspension geometry or differential mounting, leading to loss of vehicle control. Structural welding repair typically costs £800-£1500 if caught early, but advanced corrosion may require subframe replacement costing £2000-£4000. The vehicle is not safe to drive if structural integrity is compromised.
Independent garage
£800–£2,000
Specialist
£1,000–£3,000
Main dealer
£1,500–£4,000
Parts only
£400–£1,200
Dangerous
Suspension component structural damage (XU10)
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. This affects the structural areas within 30cm of suspension mounting points, compromising the vehicle's ability to safely support suspension loads. The issue appears across all mileage ranges but becomes critical above 120,000 miles, suggesting a fundamental design weakness in corrosion protection around these critical areas.
What happens if ignoredFailure of suspension mounting areas can cause sudden collapse of a corner of the vehicle or complete loss of suspension control, creating an immediate crash risk. Professional structural assessment and welding typically costs £600-£1500 per corner affected, but advanced corrosion may require replacement of entire sections. The vehicle should not be driven if structural suspension mounting integrity is compromised.
Independent garage
£600–£2,500
Specialist
£800–£3,000
Main dealer
£1,200–£4,000
Parts only
£200–£800
Major
Power steering system failure (XU10)
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. The system uses a belt-driven pump feeding a steering rack with high-pressure lines that commonly develop leaks. Failure typically starts with fluid loss from pump seals or high-pressure lines, progressing to complete pump failure if driven without adequate fluid.
What happens if ignoredComplete power steering failure makes the vehicle difficult and dangerous to manoeuvre, particularly during parking or emergency situations. Pump replacement typically costs £300-£800, while rack replacement can reach £800-£1500. Continuing to drive with low fluid will destroy the pump and potentially damage the steering rack.
Independent garage
£300–£800
Specialist
£400–£1,000
Main dealer
£600–£1,500
Parts only
£150–£500
Major
Handbrake efficiency deterioration (XU10)
The RX300 suffers from handbrake system deterioration, with MOT failures for inadequate parking brake efficiency occurring at 30 times the fleet average. The system uses rear brake shoes within the disc brake assembly, operated by cables and levers. Failures typically result from cable stretching, adjuster seizure, or contamination of the brake shoe mechanism, becoming critical above 80,000 miles where operating environment and component age combine.
What happens if ignoredInadequate handbrake efficiency creates a safety risk when parking on slopes and will cause MOT failure. Complete handbrake system overhaul typically costs £200-£500, including cable replacement, shoe adjustment, and mechanism cleaning. Seized mechanisms can cause brake drag, leading to premature disc wear and potential overheating.
Independent garage
£150–£350
Specialist
£200–£450
Main dealer
£300–£600
Parts only
£80–£200
1 more known issues tracked
Including wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.
Check a specific car →MOT failure hotspots
Based on DVSA MOT test data. These are the items where the Lexus Rx300 fails at a significantly higher rate than the average car.
Fluid leak
Suspension · 100-120k miles
MOT failure rate: 96x the fleet average
Sample: 2,276 tests
Parking brake efficiency below minimum requirement
Brakes · 60-80k miles
MOT failure rate: 52x the fleet average
Sample: 1,346 tests
Suspension component damaged or corroded
Suspension · 20-40k miles
MOT failure rate: 45x the fleet average
Sample: 145 tests
Suspension ball joints worn
Suspension · 120-150k miles
MOT failure rate: 38x the fleet average
Sample: 2,594 tests
Parking brake efficiency less than 50% of the r...
Brakes · 80-100k miles
MOT failure rate: 36x the fleet average
Sample: 3,423 tests
Power steering fault
Steering · 80-100k miles
MOT failure rate: 35x the fleet average
Sample: 5,008 tests
Buying a Lexus Rx300?
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Related
Lexus Rx300 reliability FAQs
What are the most common problems with the Lexus Rx300?
The Lexus Rx300 has 5 known issues across 3 severity levels. The most serious are: Rear subframe structural corrosion (XU10), Suspension component structural damage (XU10).
Is the Lexus Rx300 reliable?
The Lexus Rx300 has 2 dangerous and 2 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.
How much does it cost to fix Lexus Rx300 problems?
Repair costs range widely. The most significant issue (Rear subframe structural corrosion (XU10)) costs £800–£2,000 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.