1.5 / 1.7 petrol (M266)
2004–2012 · petrol · 1699cc · 116hp
Engine codes: M266
Reliability, common problems and owner reviews for the Mercedes Benz A-Class W169 1.5 / 1.7 petrol (M266). Check this before you buy used.
The M266 petrols — simple and reliable, with the 1.7 (116hp) the best balance of power and dependability (the 1.5 is underpowered). Main niggles are ignition coils, spark plugs and the odd injector/sensor causing misfire/rough idle. Prefer a 2008+ car (early faults ironed out).
Known Issues
Coils, plugs and injectors cause misfires, rough idle, stalling and check-engine lights.
Fix / Workaround: Replace coils/plugs/injectors as needed.
Repair cost: €80–€400
Typically appears after: 100,000 km
Engine oil leaks with age.
Fix / Workaround: Reseal as needed.
Repair cost: €100–€400
Year Cutoffs
Mileage Thresholds
After 200,000 km: Dependable with maintenance.
Pre-Purchase Checklist
- ☐Scan for misfire codes
- ☐Prefer the 1.7 (116hp) and 2008+
- ☐Check for oil leaks
Frequently asked questions
Is the Mercedes Benz A-Class W169 1.5 / 1.7 petrol (M266) reliable?
Maint. Sensitive — The M266 petrols — simple and reliable, with the 1.7 (116hp) the best balance of power and dependability (the 1.5 is underpowered). Main niggles are ignition coils, spark plugs and the odd injector/sensor causing misfire/rough idle. Prefer a 2008+ car (early faults ironed out).
What are the common problems and reviews for the Mercedes Benz A-Class W169 1.5 / 1.7 petrol (M266)?
The most commonly reported problems: Ignition coil / plug / injector faults, Oil leaks.
Is a used Mercedes Benz A-Class W169 1.5 / 1.7 petrol (M266) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.