Used Mercedes-Benz CLK230

What to know before buying: Mercedes-Benz CLK230

From 3 forum threads and 2 press tests · updated 12/10/2026

What the reviews say

• The W208 CLK 230 Kompressor was produced from 1997 to 2003 with a 2.3-litre supercharged M111.975 inline-four, described by the source as offering solid performance and reliability.[4]one sourceW208
• One owner reported that his CLK 230 Kompressor was still running perfectly after 310,000 km; this is an individual experience, not a guaranteed lifespan.[2]one sourceW208
• Forum contributors prefer the automatic to the manual; the five-speed automatic is described as generally robust when its fluid has been serviced.[2][5]W208

Typical faults

• The W208 is notably rust-prone. Pay particular attention to the wings, doors, boot lid, wheel arches, sill covers, jacking points and underbody.[2][4][5]W208

  1997–2003

• A failed mass-airflow sensor or intake leak can cause rough idle, stalling, hard starting, misfires and loss of power.[1][2][4]W208

  1997–2003 · M111.975

• Wear in the supercharger clutch, drive belt or tensioner, and boost leaks, can cause unusual noise, sluggish acceleration and loss of power.[2][4]W208

  1997–2003 · M111.975

• Old, low or neglected fluid in the five-speed automatic can cause jerky shifts, delayed engagement or slipping; solenoid and transmission-control-module faults are also reported.[4][5]W208

  1997–2003

• Ageing wiring or a failed SAM module can cause warning lights and malfunctioning electric windows or sunroof.[4]one sourceW208

  1997–2003

• Water-pump, radiator, fan, thermostat or coolant-hose faults can cause coolant leaks, fluctuating temperature or overheating.[4]one sourceW208

  1997–2003 · M111.975

Which engine and version to take

• The pick is the 2.3-litre supercharged M111.975: sources describe it as durable and reliable, but the supercharger, MAF and service history still need checking.[2][4]W208

What to check at the inspection

• Inspect carefully for corrosion on the front wings, doors, boot lid, wheel arches, sills, jacking points and underbody.[2][4][5]W208
• Check idle, starting and acceleration both cold and warm. Vibration, misfires or weak pull warrant diagnosis of the intake, MAF and air-recirculation actuator.[1][4]W208
• During the test drive, the automatic should shift without jerks, delay or slipping. Verify documented transmission-fluid and filter servicing.[3][4][5]W208
• Listen for unusual supercharger noise and check for smooth acceleration; inspect the belt, tensioner and intake system for leaks.[4]one sourceW208
• Check for coolant leaks, stable temperature, and the condition of the water pump, radiator, fan, thermostat and hoses.[4]one sourceW208
• Test all warning lights, electric windows and the sunroof, and scan for fault codes; an illuminated engine light is a serious warning sign.[4][5]W208

Verdict

Sources

1. [1]forums.mbclub.co.uk — CLK 230 w208 engine problems · forum
2. [2]motor-talk.de — Mercedes Benz CLK 230 Kompressor Kaufberatung · forum
3. [3]forums.mbclub.bg — Обслужване на W208 CLK 230 Kompressor Automatic ?!? · forum
4. [4]tibao.hk — Mercedes clk 230 kompressor problemas · press
5. [5]forums.mercedesclub.org.uk — buying CLK 230 - what to look for · press

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