The Mercedes S-Class is the world's most iconic luxury saloon — a technological flagship that has defined the premium car segment for decades. The W221 (2005–2013), W222 (2013–2020) and W223 (2020–present) are all on UK roads. Previous ownership costs, complex electronics and maintenance requirements make it a car that rewards careful used buying. The S-Class introduces technologies that filter down to all other Mercedes models a decade later. It remains the pinnacle of what a saloon car can be.
Quick Facts — Mercedes S-Class
Common Engines
3.0 inline-6 (S350/S400), 4.0 V8 (S500/S560), 6.0 V12 (S600/S65), 3.0 diesel (S350d/S400d), AMG S63/S65, PHEV (S580e)
7 Most Common Mercedes S-Class Problems
These are the faults most frequently seen on the Mercedes S-Class by UK garages — ranked by how commonly they occur and what they cost to fix.
AIRMATIC air suspension is standard on all S-Class models and is the most common fault category — compressor failure, strut leaks and ABC hydraulic system faults on older cars cause the car to sit on its bump stops.
💷 Typical repair cost: £600–£4,000
The Active Body Control hydraulic suspension on W221 V8 and V12 models is a notorious maintenance item — hydraulic lines crack and the system requires expensive specialist attention. All W221 buyers must budget for this.
💷 Typical repair cost: £1,000–£5,000
The S-Class has more ECUs and control modules than any other car in its class — electrical gremlins, module failures and coding requirements generate high repair bills on out-of-warranty examples.
💷 Typical repair cost: £200–£3,000+
Diesel S-Class models require AdBlue. Running low or injector faults cause warnings and prevent restarting.
💷 Typical repair cost: £10–£1,000
Diesel S-Class models on short urban journeys develop DPF blockages — a large luxury saloon diesel on a short commute is a high DPF risk.
💷 Typical repair cost: £200–£2,000
The 7G-Tronic and 9G-Tronic gearboxes develop judder and valve body wear when oil services are neglected.
💷 Typical repair cost: £500–£4,000
The Magic Body Control stereo camera (W222) reads road surface ahead — sensor faults cause the system to disable, generating warning messages.
💷 Typical repair cost: £200–£1,500
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Mercedes S-Class — MOT Tips
AIRMATIC / ABC suspension must hold correct ride height — a failing S-Class suspension is an immediate MOT concern. All warning lights must be clear. DPF and AdBlue warnings are MOT-relevant on diesel models. The complexity of S-Class electrics means pre-MOT diagnostics are strongly recommended. Any S-Class showing multiple warning lights needs specialist attention before booking an MOT.
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Mercedes S-Class Tyres
Most Mercedes S-Class models run 245/45 R18 or 245/40 R19 or 255/40 R20 or 265/35 R21 depending on trim level and year. Always check the placard inside the driver's door for the exact size for your vehicle.
Summary
The S-Class is a genuinely magnificent used luxury car — but it rewards buyers who do their homework. Budget for higher maintenance costs than most cars. The W222 S350d with full Mercedes dealer service history is the most reliable sweet spot. Avoid W221 V8/V12 models unless you have a specialist relationship and deep pockets. The W223 is still young enough to be mostly warranted.
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