Generations
UN105 — Second Generation
1995–2001
4.0L V6 SOHC
Top issues to watch for
The most serious Ford Explorer problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Dangerous
Structural corrosion at mounting points (UN105)
The Ford Explorer's body-on-frame construction uses mounting points where the body bolts to the chassis frame. These mounting points are prone to severe corrosion that compromises structural integrity. MOT data shows this model fails at 16.5 times the national average for body corrosion at mounting points, with an additional 13.9 times average failure rate for structural corrosion reducing assembly rigidity. This represents a fundamental weakness in the design's corrosion protection around critical load-bearing joints.
What happens if ignoredStructural corrosion at mounting points creates a direct safety hazard as it compromises the vehicle's ability to protect occupants in a collision. Advanced corrosion can lead to body separation from the chassis frame. The vehicle should not be driven if mounting point integrity is compromised and repair typically requires extensive welding work costing thousands of pounds.
Independent garage
£1,500–£3,000
Specialist
£2,000–£4,000
Parts only
£200–£500
Major
Suspension joint and bush wear (UN105)
The Explorer's independent front suspension uses multiple ball joints, bushes, and rubber dust covers that deteriorate at an accelerated rate. MOT data shows 13.7 times average failure rate for dust cover deterioration and 13.2 times average for excessive joint wear. The heavy weight of this SUV combined with the complexity of the suspension geometry puts high loads on these components, leading to premature failure compared to lighter vehicles.
What happens if ignoredWorn suspension joints create handling unpredictability and can lead to sudden loss of steering control if a ball joint fails completely. Multiple joints typically require replacement simultaneously, with labour costs increased by the need to reset wheel alignment. Total repair costs can reach £800-1200 for comprehensive suspension joint renewal.
Independent garage
£400–£800
Specialist
£500–£1,000
Main dealer
£800–£1,200
Parts only
£150–£300
Major
Wheel bearing failure (UN105)
The Explorer's front wheel bearings are sealed units that fail at 5.3 times the national average rate according to MOT data. The heavy weight of this SUV combined with the loads imposed by the 4WD system creates higher stress on wheel bearings than typical passenger cars. Failure typically occurs on the front axle first, with the bearing developing excessive play that affects steering precision and creates safety concerns.
What happens if ignoredA completely failed wheel bearing can cause wheel lockup or separation, creating an immediate safety hazard. The bearing and hub assembly typically require replacement as a unit. Labour is increased by the need to disconnect brake components and potentially 4WD drive components.
Independent garage
£200–£350
Specialist
£250–£400
Main dealer
£350–£500
Parts only
£80–£150
Major
Water pump failure (UN105)
The 4.0L V6 engine's water pump is documented in NHTSA complaints as a frequent failure point, with 266 specific complaints about water pump issues. The pump typically fails due to internal impeller degradation or seal failure, leading to coolant loss and potential engine overheating. This is a known weakness of Ford's 4.0L V6 engine family used across multiple vehicle platforms during this era.
What happens if ignoredComplete water pump failure leads to coolant loss and engine overheating, which can cause cylinder head warping or complete engine seizure if driven when overheated. The pump requires engine disassembly for replacement and is often done alongside timing chain service due to labour overlap.
Independent garage
£400–£600
Specialist
£500–£750
Main dealer
£600–£900
Parts only
£80–£150
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 Ford Explorer fails at a significantly higher rate than the average car.
Coil springs broken
Suspension · 100-120k miles
MOT failure rate: 454x the fleet average
Sample: 159 tests
ABS fault
Bodywork · 100-120k miles
MOT failure rate: 86x the fleet average
Sample: 199 tests
Parking brake efficiency below minimum requirement
Brakes · 80-100k miles
MOT failure rate: 77x the fleet average
Sample: 290 tests
Power steering fault
Steering · 80-100k miles
MOT failure rate: 41x the fleet average
Sample: 315 tests
Vehicle structure corroded to the extent that t...
Bodywork · 60-80k miles
MOT failure rate: 31x the fleet average
Sample: 137 tests
Electrical wiring fault
Lights & Electrics · 120-150k miles
MOT failure rate: 23x the fleet average
Sample: 331 tests
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Related
Ford Explorer reliability FAQs
What are the most common problems with the Ford Explorer?
The Ford Explorer has 5 known issues across 2 severity levels. The most serious are: Structural corrosion at mounting points (UN105).
Is the Ford Explorer reliable?
The Ford Explorer has 1 dangerous and 4 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.
How much does it cost to fix Ford Explorer problems?
Repair costs range widely. The most significant issue (Structural corrosion at mounting points (UN105)) costs £1,500–£3,000 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.