BMW 4 Series 425d Engine Replacement Compare Prices & Get Quotes

A BMW 4 Series 425d engine replacement typically costs £3,800-£6,500 for a rebuilt unit, £2,800-£5,500 for reconditioned, or £1,500-£3,200 for a used engine (supply-only). Fitting adds £650-£910 at a specialist, depending on xDrive complexity.

• Rebuilt engines include upgraded components addressing the original failure point
• 12-month unlimited-mileage warranty is standard on all rebuilt units
• Supply & fit available through our UK-wide specialist network

The most common warning sign is a rattling or clattering noise from the engine on cold start, which may fade as the engine warms up. Other symptoms include rough idling, reduced performance, and the check engine light illuminating.

• N47-equipped 425d models (2013-2016) are most affected
• Chain stretch typically becomes audible between 60,000-120,000 miles
• Ignoring the rattle can lead to catastrophic engine failure

For a 425d worth £8,000-£18,000, a rebuilt engine at £3,800-£6,500 is a viable investment if you plan to keep the car for two or more years. For sub-£8,000 examples, evaluate a used engine or targeted repair first.

• Rebuilt engines come with a 12-month warranty and upgraded components
• Compare three quotes before committing - pricing varies significantly between suppliers
• Supply & fit removes the hassle of finding a specialist yourself

A typical BMW 4 Series 425d engine replacement takes 2-3 days from order to delivery for the engine unit itself. Supply & fit adds 10-14 hours of workshop labour for a 2.0-litre diesel, depending on xDrive complexity.

• Same-day dispatch available on many used and reconditioned units
• Most specialists complete the fit within 2-3 working days
• Nationwide delivery means you're not limited to local suppliers

The BMW 425d uses the same 2.0-litre diesel block as the 420d but with a more powerful factory tune - 218-224hp versus 184-190hp. Early 425d models used the N47D20D engine; later models switched to the B47D20B with Euro 6 compliance.

• 425d power output: 218hp (N47) or 224hp (B47)
• Both share the same 2.0L displacement and four-cylinder layout
• Engine codes are not interchangeable - verify your unit before ordering

A correctly fitted replacement engine that meets the original emissions specification will not affect your MOT. All B47D20B engines are Euro 6 compliant; N47D20D engines meet Euro 5 standards.

• Ensure the replacement engine matches your car's original emissions class
• Your specialist will provide emissions documentation with the fit
• A like-for-like replacement is fully MOT-legal