Mercedes Benz Cl MOT Failures

An analysis of 2,351 real DVSA MOT tests on the Mercedes Benz Cl — what fails, how often, and how that compares to every other car on UK roads. Generations covered: C215 (1999–2006), C216 (2007–2014).

Where the Mercedes Benz Cl fails its MOT

The single biggest MOT failure point on the Mercedes Benz Cl is suspension pin, bush or joint worn — this model is 29 times more likely to fail on this item than the average car on UK roads. That makes it a significant weak point for anyone buying or owning this model. Across 2,351 MOT tests, 15.04% of all Mercedes Benz Cl tests recorded this as a failure.

Suspension failures typically mean worn bushes, drop links, or dampers. These affect handling and tyre wear. Budget £150–£400 per corner at an independent garage for full suspension overhaul.

Other notable weak points include wheel bearings worn (23x the fleet average), abs fault (13x the fleet average), tyre seriously damaged (7.8x the fleet average), and wheel badly distorted or wear between wheel and... (6.9x the fleet average). These ratios compare the Mercedes Benz Cl's failure rate on each item against the national average for all cars tested — a ratio of 10x means this model fails ten times more often than a typical car.

The failures span 4 categories: Suspension, Tyres, Wheels, Seatbelts & Airbags. If you're inspecting a Mercedes Benz Cl before purchase, these are the areas to focus on — and if any have been flagged as advisories on a previous MOT, they're likely to become failures in the near future.

How failures change with mileage

The Mercedes Benz Cl's weak points shift as the car covers more miles. Understanding these patterns helps you know what to expect — and what to budget for — at each stage of ownership.

Under 60,000 miles

At this mileage, most failures are either design-related or caused by age rather than wear. Components like bushes and drop links may not have been replaced yet, and original-fit parts can deteriorate even on low-mileage cars that spend a lot of time sitting.

For the Mercedes Benz Cl specifically, the DVSA data shows the most common failures at this mileage are suspension pin, bush or joint worn (29x the average) and wheel bearings worn (23x). wheel badly distorted or wear between wheel and... (6.9x) and wheel badly distorted or wear between wheel and... also appear frequently.

60,000 to 100,000 miles

This is where routine wear items start to show up. Brake components, tyres, and exhaust parts have done serious work by this point. Cars that have been well serviced will show fewer of these failures — this mileage band is where good maintenance really separates the well-kept from the neglected.

For the Mercedes Benz Cl specifically, the DVSA data shows the most common failures at this mileage are wheel bearings worn (17x the average) and tyre seriously damaged (7.8x).

Over 100,000 miles

High-mileage cars accumulate failures across multiple systems. The key question isn't whether things will need doing — they will — but whether the car has been maintained well enough to keep on top of them. Look for a consistent service history and recent MOT passes with minimal advisories.

For the Mercedes Benz Cl specifically, the DVSA data shows the most common failures at this mileage are suspension pin, bush or joint worn (23x the average) and abs fault (13x). seat mounting fault (5.3x) and seat mounting fault also appear frequently.

Known issues beyond the MOT

An MOT only tests roadworthiness at a single point in time — it won't catch developing faults, intermittent problems, or issues that haven't yet reached the failure threshold. These are the issues that Mercedes Benz Cl specialists and owners flag most frequently, drawn from manufacturer technical bulletins, workshop data, and verified owner reports.

Subframe structural corrosion (C215/C216) Dangerous

The front and rear subframes carry the suspension mounting points and are critical structural components. Affects C215, C216; typical independent garage repair cost is £2,000–£4,000.

Air suspension system failure (C215/C216) Major

The Airmatic air suspension system uses air springs, height sensors, and a central compressor to provide adaptive ride height control. Affects C215, C216.

Front wheel bearing failure (C215/C216) Major

The front wheel bearings on CL models are integrated hub units that carry the considerable weight of the large luxury coupe body and cope with forces from the wide, low-profile tyres typically fitted. Affects C215, C216; typical independent garage repair cost is £250–£400.

Brake line and hose deterioration (C215/C216) Major

The brake hydraulic system uses steel brake pipes and flexible rubber hoses to connect the master cylinder to the calipers at each wheel. Affects C215, C216; typical independent garage repair cost is £400–£800.

For the complete picture — including repair costs across independent, specialist, and dealer garages — see the full Mercedes Benz Cl common problems breakdown.

What to check before buying a Mercedes Benz Cl

Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a Mercedes Benz Cl:

Suspension — check for suspension pin, bush or joint worn, wheel bearings worn, abs fault. Tyres — check for tyre seriously damaged.

Beyond the MOT items, ask specifically about subframe structural corrosion and air suspension system failure. These won't show up on a standard MOT but can be expensive to fix — repairs start from £2,000. A specialist pre-purchase inspection is worth the investment on this model.

Always check the car's full MOT history for patterns — recurring advisories often become failures within 12 months. And verify the service history to confirm maintenance has been kept up to schedule. Enter any reg into our free car check to see the complete picture.

MOT failure data sourced from DVSA bulk test records via data.gov.uk. Ratios compare this model's failure rate against the national fleet average. Known issues sourced from manufacturer bulletins, specialist workshops, and verified owner reports.