Mercedes-Benz CLS 350
Four-valve V6 with variable valve timing. Smooth and powerful. Known for balance shaft wear (revision sprocket) on early build years. Balance shaft gear problem addressed by Mercedes with a recall.
Solid Basis
200 kW — everyday-capable power, without excitement.
Engine Weaknesses 6
The plastic balance shaft sprocket on the M272 wears prematurely from the timing chain. The right cylinder bank goes out of timing. Affected up to end of October 2006.
Symptoms: Fault codes P0016/P0017 (camshaft right bank), chain rattling, rough running at idle, in extreme cases engine damage
Alongside the balance shaft issue the M272 shows premature timing chain stretch. Chain wear on softer sprockets leads to timing deviations.
Symptoms: Chain noise especially on cold start, camshaft fault codes, rough running, engine irregularities
Four camshaft adjuster solenoids (two per cylinder bank) develop leaks; oil creeps into the wiring harness as far as the ECU. Repair costs up to €1,700 documented.
Symptoms: CEL, oil traces at camshaft connectors, lambda sensor failure due to oil contamination, non-specific faults that recur
Plastic components of the M272 variable intake system become brittle and break. The intake flap linkage snaps and sets fault code P2006.
Symptoms: Fault codes P2004/P2005/P2006 (intake flap), slight power loss, check engine light
The thermostat on the M272 preferentially fails in the open position. Operating temperature is not reached; especially on motorway runs temperature drops to 75–80°C.
Symptoms: Engine doesn't reach 90°C after 10–20 km, coolant temperature fluctuates heavily, reduced heater output, fault code P0128
The hydraulic engine mounts on the M272 lose their damping effect with age. Jerky movements are especially apparent when lifting off the throttle and during gear changes.
Symptoms: Vibrations in steering wheel and gear lever during load changes, judder on gear changes, droning at low revs
Vehicle Weaknesses 7
Airmatic with defective air tanks, compressor failures and leaking air springs. Front dampers approximately €700 each. Frequent money pit.
Early CLS models up to 2005 with SBC brakes: a defective pump can reduce brake pressure and increase stopping distance. Recall issued.
AIRMATIC air suspension on the C219 is highly wear-prone. The compressor has several failure points; air spring bellows fail with age.
Early C219 CLS (up to 2006) with SBC hydraulic brake — failure-prone, expensive to maintain. Mercedes replaced SBC with a conventional brake in 2006.
Wiring break means the boot cannot be unlocked via remote control. Boot interior light and number plate lighting also fail.
Three-way valve of the 4-zone automatic climate control fails; rear zone only receives warm air.
COMAND infotainment is prone to frequent crashes, freezing and complete failures. System is outdated and difficult to repair — reboot often the only fix.
Reports & Tests
179 owner complaints filed with NHTSA (2004–2010). Most reported: Fuel System (61), Brakes (32), Fuel System (29).