Mercedes-Benz S-Class: common faults & what to check
Thinking about buying a used Mercedes-Benz S-Class (2000–2023) in New Zealand? We've documented 20 known faults for this model spanning suspension, engine, brakes, and body & rust. Each researched and verified before it's published. The most serious issues here are rated critical. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
20
Documented faults
Critical
Most serious
$900–$4,000
Typical repair
7
Systems covered
Known Mercedes-Benz S-Class faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
01Magic Body Control (ABC) Active Hydraulic Suspension Failure
CriticalOccasionalSuspension $3,500–$18,000 to fix
W222 S-Class models with the optional Magic Body Control active body control hydraulic suspension suffer from expensive hydraulic component failures. The ABC pump, accumulator, and hydraulic cylinders at each corner are all documented failure points. Any leak in the high-pressure hydraulic circuit triggers a suspension fault and causes immediate ride height drop or loss of active body control. The system uses proprietary hydraulic fluid and requires specialist tooling. Hydraulic pump replacement alone costs $5,000 to $9,000 NZD at a Mercedes dealer. Independent specialists with appropriate equipment can reduce costs. Buyers must treat any W222 with Magic Body Control as carrying a significant potential liability.
Symptoms to notice
Active Body Control or suspension fault warning on dashboard
Car sitting unevenly or very low on one or more corners
Hydraulic fluid leak visible under front subframe or engine bay
Harsh uncontrolled ride when system loses hydraulic pressure
What to check
Confirm whether the vehicle has standard AIRMATIC or the higher-specification Magic Body Control (the window sticker or options list will confirm). On MBC vehicles check underneath for hydraulic fluid leaks under the front subframe area. Check that ride height is even at all four corners. Scan for active suspension fault codes. Budget for a specialist hydraulic circuit inspection if any doubt exists.
Where to look: Hydraulic pump under bonnet front-left; hydraulic cylinders at each corner strut; accumulator on front subframe
Ask the seller
“Does this car have Magic Body Control or standard AIRMATIC?”
“Has the Active Body Control system had any fault warnings?”
“Have any hydraulic components been replaced, and can you provide receipts?”
“Has there been any hydraulic fluid leak under the vehicle?”
02Electronics faults - COMAND freezes, screen issues, driver-assist sensor and camera failures, battery drain (W222)
MinorCommonElectrical $300–$2,500 to fix
The W222 carries an enormous electronics load and gremlins are common as they age: COMAND freezes and reboots, screen problems, failures of individual radar/parking/camera sensors that disable driver-assist features, and parasitic battery drain that flattens the main battery. Most individual fixes are moderate, but sensor and camera units are dear, and intermittent faults can take hours of diagnosis. A thorough function-check of every assist system on the test drive is the cheapest insurance.
Symptoms to notice
COMAND freezing or rebooting
Warning messages for radar/camera/parking systems
Driver-assist features unavailable
Battery warnings or flat battery after sitting
What to check
Spend ten minutes testing everything: navigation, cameras (360 view), active cruise, lane keeping, parking sensors, all seat functions including massage, soft-close doors and the head-up display. Any 'currently unavailable' message is a pending bill. Ask how old the battery is and whether the car is kept on a trickle charger.
Where to look: COMAND head unit and screens in the dash; radar/camera sensors in grille, windscreen and bumpers
Ask the seller
“Do all the driver-assist systems work with no warning messages?”
“Has the COMAND unit or any camera/radar sensor been replaced?”
“How old is the battery?”
EngineCritical
EngineCritical
BrakesCritical
EngineMajor
EngineMajor
Body & RustMajor
ElectricalMajor
ElectricalMajor
SuspensionMajor
SuspensionMajor
SuspensionMajor
Fluid LeaksMajor
SuspensionMajor
TransmissionMajor
EngineMajor
TransmissionMajor
ElectricalMinor
ElectricalMinor
18 more documented faults on the Mercedes-Benz S-Class
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 20 documented faults for the Mercedes-Benz S-Class, the recurring problem areas are suspension, engine, and brakes. A Mercedes-Benz S-Class with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used Mercedes-Benz S-Class?
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We've catalogued 20 known faults for the Mercedes-Benz S-Class, covering suspension, engine, and brakes. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Mercedes-Benz S-Class?
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Most single repairs on the Mercedes-Benz S-Class fall between $900–$4,000 at NZ independent-workshop rates. Some of the 20 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a Mercedes-Benz S-Class?
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Yes. A Mercedes-Benz S-Class inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.