2005–2009 Mercedes-Benz S-Class (W221)
Browse our directory of 2005–2009 Mercedes-Benz S-Class (W221) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.
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Common Problems & Reliability
The 2005–2009 Mercedes-Benz S-Class (W221) has 3 known issues. 2 of these are classified as serious faults that could be expensive to repair.
Airmatic / ABC suspension failure
SeriousAir springs leak and compressors wear out. ABC (Active Body Control) hydraulic systems on sport models are even more expensive to repair. Cars sag on one corner and throw suspension warnings.
Symptoms: One corner sits low, Suspension malfunction warning...
Est. repair cost: £800–£3,000
M273 V8 balance shaft sprocket wear
SeriousThe V6 and V8 M273 engines can suffer from balance shaft sprocket wear, which alters engine timing and can lead to catastrophic failure if not caught early.
Symptoms: Engine management light (P0016/P0017 codes), Rough idle...
Est. repair cost: £2,000–£4,000
COMAND infotainment glitches
MinorThe COMAND system can develop disc read errors, screen freezing and audio dropouts. Replacement units are very expensive.
Symptoms: Disc read errors, Screen freezing...
Est. repair cost: £200–£800
Buying Tips for the 2005–2009 Mercedes-Benz S-Class (W221)
- ✓Test the Airmatic or ABC suspension from cold; leave it parked overnight before buying.
- ✓Check the COMAND infotainment system for lag, rebooting or disc read errors.
- ✓V8 petrols need evidence of regular oil changes and check for balance shaft wear on early M273 engines.
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