Mercedes-Benz B-Klasse 246/242 facelift B 180, 122 PS, 6-speed manual (2014–2018)

Research for this car

• Engine guide Mercedes M270 1.6 and 2.0 turbo petrol (A 180, A 200, CLA 200): problems, costs and what to check

  A decent engine when the oil is changed on time, but a cold-start rattle or unusual engine noise on a 2015 car should stop the deal.

Known issues for this car

Before you buy this car

From the engine guide

1. Timing chain (scanner needed). Start the engine cold and listen for a metallic rattle for 1-3 seconds. Ask for Xentry live cam data and check for codes P0016, P0017 and P0011. Bad: a rattle, any of those codes, or a chain reported as slack. A jumped chain can destroy the engine.
2. Camshaft (no scanner). For a 2015 car, listen for unusual engine noise at idle and under load, and check for power loss and rough running. Bad: a noisy engine, or power loss and rough running on the test drive.
3. Thermostat (scanner needed). From cold, the engine should reach about 80 C within 10 minutes, and the live reading should sit between 95 and 105 C. Read codes P0128 or P1296. Bad: a temperature that stays low, overheating, or either code.
4. Coolant (no scanner). Check the level when cold and again after a few weeks. Bad: a falling level or coolant stains around the expansion tank.
5. Injectors and intake valves (scanner needed). Look for rough idle, misfires, power loss and higher fuel use. Bad: a misfire code or a rough idle.
6. Oil and service history (no scanner). Ask for oil change records. Long gaps between changes and short trips speed up chain wear. Bad: long gaps or no records.

Running costs

ADAC figures for 15,000 km a year over 60 months

ADAC versions