2021 Mercedes-Benz S-Class 2.9L Diesel · NK21 GVR
2021 Mercedes-Benz S-Class (2.9L, diesel). First registered 03 Mar 2021. MOT valid until 09 Sept 2027.
- Make & Model
- MERCEDES-BENZ S-Class
- Year / Origin
- 2021 · Newcastle
- Safety Recall
- Unknown
- MOT Status
- Valid until 09 Sept 2027
- Road Tax
- —
- Recorded Mileage
- —
- ULEZ Compliance
- ULEZ Compliant (Euro 6 Diesel)
- Fuel & Engine
- Diesel · 2.9L
- Reliability Guide
- Common Faults
Thinking of buying this vehicle? Free MOT and tax checks do not cover legal ownership. If outstanding finance exists, finance companies have legal right to repossess without compensation.
NK21 GVR Key Findings
- No MOT test records found for this registration
- MOT valid until 09/09/2027
Derived directly from the recorded DVSA and DVLA data shown on this page.
MOT Status
No MOT history available
No MOT test records were found for this registration. DVSA’s digital archive only covers tests from 2005, so a vehicle that has not been tested since then may legitimately have no visible history.
Technical Specifications
Core Specifications
Identification & Status
Dimensions & Weights
Diagnostic & Valuation Intelligence
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Known faults for Mercedes-Benz Mercedes-Benz S-Class (W223)
Our database tracks 4 specific mechanical faults and recurring failure patterns identified across UK MOT testing stations for this generation.
MOT Roadworthiness: Average
This rating reflects historical MOT pass rates and recurring advisory wear patterns from official DVSA test logs. Note that roadworthiness does not verify outstanding finance, insurance write-offs, or stolen records.
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Digital Service History
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MOT Status
No MOT history available
No MOT test records were found for this registration. DVSA’s digital archive only covers tests from 2005, so a vehicle that has not been tested since then may legitimately have no visible history.
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MERCEDES-BENZ S-Class Model Intelligence & Reliability
Verified MOT failure trends, buying advice, and technical directory specifications.
Owner-reported defects, recurring MOT failure points, and estimated repair costs.
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Historical MOT pass rates and DVLA records for 2021 model year cars.
- eCall and communication-module software recallsModerate
The single biggest W223 recall cluster is the emergency-call system. DVSA lists several campaigns against the 2021 model year S-Class, including R/2021/110 affecting 108,971 UK vehicles, R/2021/133 at 106,665 and R/2021/134 at 162,581, all for the behaviour of the emergency-call system not meeting specification; Mercedes said a faulty call could stop emergency services locating the crash site, and BBC News reported the global scale of the same eCall fix. Separate R/2022/032 and R/2021/308 campaigns cover the communication module software. An unremedied car is a genuine safety problem and a resale obstacle.
- Electric coolant pump seepage into the vacuum systemSerious
DVSA campaign R/2021/438 covers 35,624 UK cars across the 222 and 257 platforms, including the S-Class, because the coolant pump could leak between the vacuum system and the coolant circuit; the remedy is pump replacement. Specialist Mercedes guides describe the same weakness on the M256 and M176 engines as split cooling with multiple electric pumps and hoses, with overheating warnings and dropping coolant levels as the tell-tale, and warn the pumps are moderate-mileage items from 30,000 miles. On a W223 the pump sits deep in a densely packed bay, so labour dominates the bill.
- 48V electrical system and control-unit faultsModerate
The W223's 48V mild-hybrid network runs the integrated starter-generator, a small lithium battery and a dense set of control units. DVSA campaign R/2021/280 covers wrongly torqued 48V wiring harness bolting on a body-side support, and R/2022/032 and R/2021/309 cover communication-module software. Specialist guides report integrated starter-generator fault codes, rough restarts and premature BSG failure between 20,000 and 50,000 miles, plus 48V battery capacity loss after five or six years that disables stop-start and throws warnings. A degraded 48V supply is also why a fully charged traction or 12V battery car can still refuse to wake up.
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