Generations
C219 — CLS-Class (First Generation)
2003–2010
3.0 CDI, 3.5, 3.5 CDI, 5.0, 5.4, 5.5 AMG
C218 — CLS-Class (Second Generation)
2011–2018
2.1 CDI, 3.0 CDI, 3.5, 5.5 AMG
C257 — CLS-Class (Third Generation)
2018–2024
2.0 CDI, 2.9 CDI, 3.0
Top issues to watch for
The most serious Mercedes Benz Cls problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Dangerous
Brake pipe corrosion and failure
CLS models show significantly elevated brake pipe corrosion rates, with MOT data showing failure rates up to 8.1x the fleet average. The complex brake line routing around the air suspension components and extensive underfloor piping creates multiple corrosion points. Flexible brake hoses also fail at 28.6x the fleet average rate, particularly affecting diesel variants. This represents a critical safety defect that can lead to complete brake system failure.
What happens if ignoredBrake pipe failure can cause complete loss of braking on affected circuits. With the CLS using a dual-circuit system, failure of one circuit reduces braking performance by approximately 50% and illuminates the brake warning light. Complete system failure is possible if multiple pipes fail. Emergency repairs require immediate professional attention. Full brake line replacement typically costs £800-£1,500.
Independent garage
£200–£800
Specialist
£300–£1,000
Main dealer
£500–£1,500
Parts only
£50–£200
Major
Wheel bearing excessive play and failure
CLS models experience wheel bearing failure at 20.1x the fleet average rate, affecting all engine variants across the model range. The heavy weight of the CLS combined with its low-profile tyres and large wheel options places excessive loads on the wheel bearings. The complex multi-link suspension design also creates additional stress points. This is particularly prevalent on earlier generations with air suspension variants.
What happens if ignoredWorn wheel bearings create dangerous handling characteristics and can lead to wheel separation if completely failed. The bearing may seize suddenly, causing loss of control. Replacement typically requires the complete hub assembly and professional installation due to the integrated ABS sensor and complex suspension geometry requiring wheel alignment afterwards.
Independent garage
£300–£500
Specialist
£400–£650
Main dealer
£600–£1,000
Parts only
£150–£300
Major
Suspension component wear
The CLS features a complex multi-link rear suspension with numerous bushes and joints that wear at 16x the fleet average rate. The sophisticated suspension design uses many rubber components that deteriorate over time, particularly affecting ride quality and handling precision. Air suspension variants on earlier models have additional complexity with air spring and damper integration issues.
What happens if ignoredWorn suspension components compromise handling safety and accelerate tyre wear. Multiple components typically require replacement simultaneously due to the interconnected design. Complete suspension refurbishment can cost £2,000-£4,000 depending on variant. The car remains driveable but handling becomes progressively less predictable.
Independent garage
£200–£600
Specialist
£300–£800
Main dealer
£500–£1,200
Parts only
£100–£400
Major
Electronic parking brake failure (C218)
Second-generation CLS models with electronic parking brake systems show failure rates 14.4x higher than the fleet average. The electronic parking brake actuator motors and associated control modules are prone to failure, particularly on diesel variants. This system replaces the traditional handbrake with electric motors that clamp the rear brake calipers, and when it fails the parking brake becomes completely inoperative.
What happens if ignoredComplete failure of the parking brake system means the car cannot be secured when parked on slopes, creating a safety hazard. The car may also fail its MOT test. Repair typically requires replacement of the actuator motors and possibly the control module, with costs ranging from £800-£1,500. The car can be driven but parking on inclines becomes dangerous.
Independent garage
£400–£800
Specialist
£500–£1,000
Main dealer
£800–£1,500
Parts only
£300–£600
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 Cls fails at a significantly higher rate than the average car.
Any fracture or welding defect on a wheel
Wheels · 20-40k miles
MOT failure rate: 506x the fleet average
Sample: 1,714 tests
Parking brake inefficient
Brakes · 60-80k miles
MOT failure rate: 64x the fleet average
Sample: 10,967 tests
Brake hoses perished or damaged
Brakes · 20-40k miles
MOT failure rate: 29x the fleet average
Sample: 1,984 tests
Front or rear fog lamp with a multiple light so...
Lights & Electrics · 100-120k miles
MOT failure rate: 29x the fleet average
Sample: 5,213 tests
Wheel bearings worn
Suspension · 20-40k miles
MOT failure rate: 19x the fleet average
Sample: 12,489 tests
Emissions failure
Exhaust & Emissions · 20-40k miles
MOT failure rate: 17x the fleet average
Sample: 272 tests
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Related
- Mercedes Benz Cls buyer's guide
- Mercedes Benz Cls service history check
- Mercedes Benz Cls service schedule & costs
- Mercedes Benz Cls MOT failure rates
- Mercedes Benz Cls price guide
- Buying a car without service history
- Mercedes Benz Cls car check £7.49
- Free car faults check
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- Free car check
Mercedes Benz Cls reliability FAQs
What are the most common problems with the Mercedes Benz Cls?
The Mercedes Benz Cls has 5 known issues across 3 severity levels. The most serious are: Brake pipe corrosion and failure.
Is the Mercedes Benz Cls reliable?
The Mercedes Benz Cls has 1 dangerous and 3 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 Cls problems?
Repair costs range widely. The most significant issue (Brake pipe corrosion and failure) costs £200–£800 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.
Which Mercedes Benz Cls generation is most reliable?
The C219 (2003–2010) has the fewest dangerous issues (1). However, condition and service history matter more than generation — a well-maintained earlier car can be more reliable than a neglected newer one.