Quick Facts — Mercedes S-Class
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.
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Find Your Problem Now →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.
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.
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Frequently Asked Questions
What is the most common problem with the Mercedes S-Class?
The most frequently reported issue on the Mercedes S-Class is AIRMATIC Air Suspension Failure. 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.
How many Mercedes S-Classs are on UK roads?
There are an estimated 20,000+ Mercedes S-Classs currently on UK roads.
What tyres does the Mercedes S-Class use?
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.
Will a warning light fail my Mercedes S-Class's MOT?
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.
Similar Issues on Other Models
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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