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1.7 / 2.0 petrol (M266)

2005–2011 · petrol · 2034cc · 136hp

Engine codes: M266

Maint. Sensitive

Reliability, common problems and owner reviews for the Mercedes Benz B-Class 1.7 / 2.0 petrol (M266). Check this before you buy used.

The W245 shares the A-Class M266 petrols — simple, reliable engines, with the 2.0 (B200, incl. turbo) the better-matched choice for the taller, heavier B-Class body. Main niggles are ignition coils, plugs and the odd injector/sensor causing misfires and rough idle; prefer a 2008+ car with the early faults sorted. Note the 2.0 is 2,034cc (over 2.0L for tax in some countries). A dependable, low-drama people-carrier engine.

Same engine, other cars

This is the same physical engine (M266) sold under different names across brands. Reliability is broadly shared — cross-check these:

Known Issues

Coil / plug / injector faultsrecurring

Coils, plugs and injectors cause misfires, rough idle, stalling, EML.

Fix / Workaround: Replace coils/plugs/injectors as needed.

Repair cost: €80–€400

Typically appears after: 100,000 km

Oil leaksminor

Engine oil seepage with age.

Fix / Workaround: Reseal as needed.

Repair cost: €100–€400

Year Cutoffs

2008: Before — Earlier cars — more early-life faults. After — 2008+ — many faults ironed out.

Mileage Thresholds

After 200,000 km: Dependable with maintenance.

Pre-Purchase Checklist

  • ☐Scan for misfire codes
  • ☐Prefer 2.0 (B200) + 2008+
  • ☐2034cc tax note

Frequently asked questions

Is the Mercedes Benz B-Class 1.7 / 2.0 petrol (M266) reliable?

Maint. Sensitive — The W245 shares the A-Class M266 petrols — simple, reliable engines, with the 2.0 (B200, incl. turbo) the better-matched choice for the taller, heavier B-Class body. Main niggles are ignition coils, plugs and the odd injector/sensor causing misfires and rough idle; prefer a 2008+ car with the early faults sorted. Note the 2.0 is 2,034cc (over 2.0L for tax in some countries). A dependable, low-drama people-carrier engine.

What are the common problems and reviews for the Mercedes Benz B-Class 1.7 / 2.0 petrol (M266)?

The most commonly reported problems: Coil / plug / injector faults, Oil leaks.

Is a used Mercedes Benz B-Class 1.7 / 2.0 petrol (M266) worth buying?

Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.