Mercedes-Benz A-Class 200 CDI Engine Replacement Compare Prices & Get Quotes

A replacement engine for an A200 CDI typically costs between £500 and £5,000 depending on the engine code and condition. Used OM640 units start from £500-£1,200, reconditioned from £1,500-£2,800, and fully rebuilt OM651 engines from £2,500-£5,000. Labour for supply & fit adds £400-£800.

• Used OM640 (W169): £500-£1,200
• Rebuilt OM651.901 (W176, 2012-2014): £2,500-£4,800
• Rebuilt OM651.930 (W176, 2014-2018): £2,800-£5,000

On OM651-equipped A200 CDI models (W176, 2012-2018), the most common symptom is a rattling noise from the rear of the engine on cold start. Other signs include loss of power, engine misfires, and the engine management light illuminating. If you hear any unusual sounds, have the timing system inspected immediately - ignoring the rattle can lead to catastrophic engine failure.

• Cold-start rattle from the rear of the engine
• Loss of power and rough running
• Engine management light activation

It depends on the generation and condition. A W169 A200 CDI is typically worth £1,500-£4,000 - a full engine replacement often exceeds the car's value, making a used engine or targeted repair more economical. A W176 A200 CDI is worth £5,000-£14,000 - a rebuilt OM651 engine (£2,500-£5,000) can be a worthwhile investment if you plan to keep the car. Always compare the cost of repair against the car's market value.

• W169 (2004-2012): used engine or targeted repair
• W176 (2012-2018): rebuilt engine with warranty is viable
• Vehicle worth over £6,000: replacement usually justifies the cost

The OM640 (W169) and OM651 (W176) engines are known for their durability and can exceed 200,000-250,000 miles with proper maintenance. Regular oil changes (every 10,000 miles) and timely replacement of timing chain components and EGR coolers are key to maximising engine life. The OM651.930 2.1L variant is particularly robust when properly maintained.

• OM640/OM651: 200,000+ miles achievable
• Regular maintenance is essential for all variants
• Timing chain and EGR cooler are the main wear items

The OM640 is Mercedes' own 2.0-litre four-cylinder diesel used in the W169 A200 CDI (2004-2012), producing 140 hp. The OM651.901 is a 1.8-litre diesel used in the early W176 A200 CDI (2012-2014), producing 136 hp with a rear-mounted timing chain. The OM651.930 is a 2.1-litre diesel introduced in the 2014 facelift, also producing 136 hp but with improved emissions and available with 4MATIC all-wheel drive.

• OM640: 2.0L, 140 hp, W169 (2004-2012)
• OM651.901: 1.8L, 136 hp, W176 (2012-2014)
• OM651.930: 2.1L, 136 hp, W176 (2014-2018), available with 4MATIC

Power loss in the A200 CDI can be caused by several issues depending on the engine. On OM651 engines, timing chain stretch can cause cam timing drift, reducing power. On both OM640 and OM651, EGR valve clogging, DPF blockage, or turbocharger actuator failure are common culprits. On OM651.930, turbo stress can be higher in 4MATIC applications. A diagnostic check with Mercedes STAR or compatible equipment is essential to identify the exact cause.

• Timing chain stretch (OM651) - power loss + rattling
• EGR valve / DPF clogging - common on all diesels
• Turbo actuator failure - especially on higher-mileage units