M166
Mercedes-Benz · M166 A-Class 1.4/1.6
1997–2004
"W168 A-Class. Infamous moose test rollover era. Engine itself is adequate but head gasket failures common. Oil leaks. Not a strong Mercedes engine. Better to look at M271 successor."
Mileage Risk Timeline
When problems typically appear — enter your mileage to see your risk zone
Known Issues 1
Head gasket failure
▸Overheating, coolant loss
A-Class M166 head gasket is a known weak point.
Φλάντζα κεφαλής W168 — κλασικό. €500-1,200.
Models with M166 3
Other Mercedes-Benz Engines
Tuning Potential
None
Frequently Asked Questions
Is the Mercedes-Benz M166 reliable?
The Mercedes-Benz M166 scores 55/100 with a verdict of CAUTION. It has 1 documented issues with total repair costs between €500 and €1,200.
What are the common problems with the M166?
The most common issues are:
- Head gasket failure — high, repair cost €500–€1,200, 60,000 km–120,000 km
What cars use the Mercedes-Benz M166?
How much does it cost to repair the M166?
Total potential repair costs for all 1 known issues range from €500 to €1,200. The most expensive issue is typically .
What years was the M166 produced?
The Mercedes-Benz M166 was produced from 1997 to 2004. It is a 1598cc I4 petrol na engine.
Verdict and scores are editorial opinions based on aggregated data. Learn about our methodology. Not a substitute for professional inspection.