Mercedes-Benz B Class B180 / B200 Petrol Engine Replacement Compare Prices & Get Quotes

A rebuilt Mercedes-Benz B Class B180 or B200 petrol engine typically costs £1,100-£3,200 supply-only, depending on which generation and engine code your car has. M266.960 (W245) units are the most affordable; M270.920 (B250) and M282.914 (W247) command premium pricing.

• Used engine: £800-£1,800 depending on mileage and condition
• Reconditioned engine: £1,300-£2,600
• Rebuilt engine: £1,100-£3,200 with 12-month warranty
• Fitting adds £400-£800 at a specialist

The most common warning sign on M270 (W246) petrol engines is a rattling noise on cold start, lasting 1-3 seconds. This indicates camshaft adjuster wear or timing chain stretch.

• Rattling on cold start - the first and most important warning sign
• Engine management light with P0011, P0014 or camshaft correlation codes
• Loss of power, misfire or rough running
• Complete failure leads to chain snap, bent valves and catastrophic engine damage

All petrol engines in the Mercedes-Benz B Class B180 and B200 use a timing chain, not a belt. The M266 (W245) uses a single roller chain; the M270 (W246) uses a dual-stage timing chain system; the M282 (W247) uses a chain-driven valvetrain.

• M266.960: single roller chain, front-mounted
• M270.910/M270.920: dual-stage timing chain, front-mounted
• M282.914: chain-driven, front-mounted
• None of these engines have a cambelt - no scheduled replacement interval, but tensioner and chain wear is common
• Cold-start rattle = timing chain or adjuster warning - act immediately

For W245 models (2005-2011) worth £1,500-£3,500, a rebuilt engine at £1,100-£2,800 often approaches the car's value. However, if the body and transmission are sound, specialist replacement with 12-month warranty can still be cheaper than buying a comparable replacement car. W246 models (2011-2018, worth £4,000-£9,000) and W247 models (2019-present, worth £9,000-£18,000) are almost always worth repairing.

• W245 (2005-2011): value £1.5k-£3.5k - borderline economical, evaluate carefully
• W246 (2011-2018): value £4k-£9k - replacement makes sense
• W247 (2019-present): value £9k-£18k - definitely worth replacing
• Rebuilt engine (£1.1k-£3.2k fitted) often cheaper than comparable replacement car

Well-maintained M266 engines regularly reach 150,000-200,000 miles; M270 engines typically last 150,000-180,000 miles with proper servicing; M282 units are too new for definitive data but expected to match M270 longevity.

• M266 (W245): 150,000-200,000 miles; oil consumption the main limiter
• M270 (W246): 150,000-180,000 miles; camshaft wear and timing chain the primary concerns
• M282 (W247): reliability data still emerging; injector seal leaks and carbon buildup the main concerns
• Regular oil changes (every 10,000 miles or annually) essential for all petrol engines
• Direct-injection M270 and M282 engines benefit from occasional intake valve carbon cleaning

The B180 and B200 share the same engine family in each generation but are tuned differently. In the W245 (M266), the B180 (1.7L) produces 116bhp while the B200 (2.0L) produces 136bhp. In the W246 (M270.910), the B180 produces 122bhp while the B200 produces 156bhp from the same 1.6L displacement. In the W247 (M282.914), the B180 produces 136bhp while the B200 produces 150-163bhp from the same 1.3L displacement.

• Same engine family, different state of tune
• B180: lower power, better fuel economy
• B200: higher power, slightly worse economy
• Replacement engines are not interchangeable without ECU remapping