Generations
W638 — First Generation
1996–2003
2.0 M111, 2.2 CDI OM611, 2.3 D OM601
W639 — Second Generation
2003–2014
2.1 CDI OM646, 2.1 CDI OM651, 2.1 CDI OM646, 2.2 CDI OM646, 3.0 CDI OM642, 3.0 CDI OM642
W447 — Third Generation
2014–2024
1.6 CDI OM622, 1.9 CDI OM622, 2.1 CDI OM651
Top issues to watch for
The most serious Mercedes Benz Vito problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Dangerous
Subframe and suspension mounting point corrosion
The Vito suffers from severe structural corrosion around subframe and suspension component mounting points, particularly affecting the load-bearing structure within 30cm of mounting brackets. This is the most critical failure mode documented in MOT data, with failure rates up to 188 times the fleet average. The corrosion compromises the vehicle's structural integrity and can render the vehicle unsafe to drive. Commercial use with heavy loading accelerates the problem through stress concentration at already weakened areas.
What happens if ignoredStructural failure of suspension mounting points creates an immediate safety hazard with potential for suspension collapse or loss of vehicle control. Repair typically requires extensive welding work or replacement of structural sections, often costing £2,000-£5,000 depending on the extent of damage. Severe cases may be beyond economical repair.
Independent garage
£1,500–£4,000
Specialist
£2,000–£5,000
Main dealer
£3,000–£7,000
Parts only
£300–£800
Dangerous
Brake hose deterioration
Flexible brake hoses show excessive deterioration rates on the Vito, failing at 53.9 times the fleet average according to MOT data. The commercial duty cycle with frequent heavy braking, combined with exposure to road debris and salt, accelerates rubber deterioration. Brake hose failure can result in complete loss of braking ability, making this a critical safety issue.
What happens if ignoredBrake hose failure can cause complete loss of braking ability, creating an immediate safety hazard. Even partial failure reduces braking efficiency and can cause the vehicle to pull under braking. Replacement of individual hoses costs £50-£150 per hose, but all hoses should be inspected when one fails as they typically age at similar rates.
Independent garage
£200–£400
Specialist
£250–£500
Main dealer
£300–£600
Parts only
£50–£150
Major
General body structure corrosion
Widespread body corrosion affects the Vito's structural rigidity, with MOT data showing failure rates 80 times the fleet average for vehicle structure corroded to the extent that rigidity is seriously reduced. The commercial duty cycle, frequent loading, and exposure to varied environmental conditions accelerate corrosion. Areas particularly affected include the rear load compartment, door pillars, and areas around mounting points.
What happens if ignoredSevere structural corrosion compromises vehicle safety and can lead to MOT failure. Extensive bodywork repairs may cost £1,000-£3,000 depending on affected areas. In severe cases, the vehicle may be beyond economical repair, particularly on older high-mileage examples.
Independent garage
£800–£2,500
Specialist
£1,000–£3,000
Main dealer
£1,500–£4,000
Parts only
£200–£600
Major
Excessive exhaust smoke emission (W447)
Third-generation Vito diesel models show excessive exhaust smoke at rates 92.6 times the fleet average, primarily affecting newer vehicles with DPF-equipped engines. The issue typically relates to DPF regeneration problems, EGR valve carbon build-up, or turbocharger oil seal failure. Commercial stop-start duty cycles prevent proper DPF regeneration, leading to system blockage and visible smoke emission.
What happens if ignoredExcessive smoke emission causes MOT failure and may indicate expensive repairs. DPF replacement costs £1,500-£3,000, turbocharger replacement £1,000-£2,500, and EGR valve cleaning or replacement £300-£800. Continued driving with excessive smoke can cause further engine damage and increased repair costs.
Independent garage
£500–£2,500
Specialist
£800–£3,000
Main dealer
£1,200–£4,000
Parts only
£200–£1,500
1 more known issues tracked
Including wear items, electrical niggles, and generation-specific problems.
MOT failure hotspots
Based on DVSA MOT test data. These are the items where the Mercedes Benz Vito fails at a significantly higher rate than the average car.
Towbar fault
Bodywork · 0-20k miles
MOT failure rate: 415x the fleet average
Sample: 464 tests
Light unit fault
Lights & Electrics · 80-100k miles
MOT failure rate: 263x the fleet average
Sample: 4,126 tests
Sharp bodywork damage
Bodywork · 0-20k miles
MOT failure rate: 166x the fleet average
Sample: 1,513 tests
Brake fluid warning light illuminated or defective
Brakes · 0-20k miles
MOT failure rate: 115x the fleet average
Sample: 4,170 tests
Emissions failure
Exhaust & Emissions · 0-20k miles
MOT failure rate: 93x the fleet average
Sample: 2,572 tests
Power steering fault
Steering · 0-20k miles
MOT failure rate: 92x the fleet average
Sample: 581 tests
Looking at a specific Mercedes Benz Vito?
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Related
- Mercedes Benz Vito buyer's guide
- Mercedes Benz Vito service history check
- Mercedes Benz Vito service schedule & costs
- Mercedes Benz Vito MOT failure rates
- Mercedes Benz Vito price guide
- Buying a car without service history
- Mercedes Benz Vito car check £7.49
- Free car faults check
- Free MOT failure rate check
- Free car check
Mercedes Benz Vito reliability FAQs
What are the most common problems with the Mercedes Benz Vito?
The Mercedes Benz Vito has 5 known issues across 3 severity levels. The most serious are: Subframe and suspension mounting point corrosion, Brake hose deterioration.
Is the Mercedes Benz Vito reliable?
The Mercedes Benz Vito 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 Mercedes Benz Vito problems?
Repair costs range widely. The most significant issue (Subframe and suspension mounting point corrosion) costs £1,500–£4,000 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.
Which Mercedes Benz Vito generation is most reliable?
The W638 (1996–2003) has the fewest dangerous issues (0). However, condition and service history matter more than generation — a well-maintained earlier car can be more reliable than a neglected newer one.