SuspensionHigh
Airmatic air suspension compressor and strut leaks
- Typically appears
- 70,000+ miles
- What to inspect
- Check ride height overnight and listen for the compressor cycling frequently
2013–2020 Mercedes-Benz S-Class · common problems & known faults
A supremely comfortable flagship saloon, but air suspension, electronics and expensive service items mean cheap examples often carry hidden costs.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed August 2026
Quick answer
The most commonly reported faults on the 2013–2020 Mercedes-Benz S-Class are Airmatic air suspension compressor and strut leaks, COMAND infotainment and control unit software faults and Water ingress in LED Intelligent Light System units causing control module failure. 4 of the documented issues are rated high severity · inspect these first. Full inspection points, onset mileage and what to check are listed below.
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Build the inspection planReliability snapshot
Based on the documented faults on this page for the Mercedes-Benz S-Class.
3.4/ 10
- Critical
- 0
- High
- 4
- Medium
- 4
- Low
- 0
Guidance only · reflects reported patterns, not a specific car's condition.
Known faults to check
ElectricalHigh
COMAND infotainment and control unit software faults
- Typically appears
- Age-related
- What to inspect
- Test every electronic feature including massage seats, cameras and screens
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Build the inspection planEngineMedium
Balance shaft and timing chain wear on V6 diesel units
- Typically appears
- 90,000+ miles
- What to inspect
- Cold start and listen carefully for rattling from the front of the engine
CoolingMedium
Coolant leaks from plastic pipes and water pump seals
- Typically appears
- 70,000+ miles
- What to inspect
- Check coolant level and inspect for staining around pipe joints
BrakesMedium
Electronic parking brake actuator failures
- Typically appears
- 70,000+ miles
- What to inspect
- Test the electronic parking brake engages and releases smoothly
Exhaust / EmissionsMedium
NOx sensor failure triggering the engine management light and an AdBlue countdown.
- Typically appears
- 50,000-80,000 miles
- What to inspect
- Cycle the ignition and check the instrument cluster for an illuminated EML or an 'AdBlue check engine in XXX miles' warning message.
Exterior / LightingHigh
Water ingress in LED Intelligent Light System units causing control module failure.
- Typically appears
- 4-7 years
- What to inspect
- Check the lower inside edges of both headlight lenses for heavy condensation or pooling water, and cycle through all lighting modes.
TransmissionHigh
Rough or jerky downshifts in the 9G-Tronic gearbox due to electrohydraulic valve body wear.
- Typically appears
- 60,000-100,000 miles
- What to inspect
- Drive the vehicle up to 15 mph on the forecourt and brake gently to a halt, feeling for harsh clunks when shifting from 3rd to 2nd or 1st.
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Build my inspection planFrequently asked questions
Is the S-Class costly to run?
Yes, air suspension and electronic repairs can be very expensive without a full history.
What is the most important pre-purchase check?
An overnight ride height check combined with testing every electronic comfort feature.
Which engine is the most dependable?
Later diesel and petrol V6 units with documented chain checks tend to be the safer choice.
Should I avoid cars without main dealer history?
It is strongly advisable to seek full service history given the complexity of this generation.
Do the AMG Line alloy wheels suffer from any specific issues?
The larger 19-inch and 20-inch AMG Line alloy wheels are highly susceptible to cracking and buckling on UK roads due to the vehicle's substantial kerb weight and low-profile tyres. Always inspect the inner rims for hairline fractures or previous weld repairs, as replacement wheels are exceptionally expensive.
Are there any common problems with the panoramic sunroof?
The panoramic sunroof guide rails are prone to drying out and accumulating dirt, leading to excessive creaking over uneven surfaces or the glass panel jamming. Ensure the roof opens and closes smoothly without groaning noises, and check the wind deflector mesh for tears or debris buildup.
Sources & further reading
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.
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