BMW 1 Series 125d Engine Replacement Compare Prices & Get Quotes

A BMW 1 Series 125d engine replacement typically costs £1,250-£4,800 for a reconditioned or rebuilt unit supply-only, depending on the engine code and specification. With supply and fit, expect £2,700-£6,000 depending on the specialist and location.

• Used N47D20 engines: £1,250-£1,900
• Reconditioned N47D20: £1,250-£2,300
• Rebuilt B47D20 with warranty: £2,800-£4,200

The most common warning signs of N47 timing chain failure in a BMW 1 Series 125d include a rattling noise from the rear of the engine on cold start, rough idling, poor engine performance, and in later stages, the engine management light illuminating.

• Rattling noise lasting 1-2 seconds on cold start is the earliest warning
• The N47 timing chain is at the rear of the engine, making inspection and replacement difficult
• A snapped timing chain on an N47 engine usually means catastrophic engine damage

A 2012-2015 BMW 1 Series 125d is typically valued at £5,000-£12,000. If your 125d is worth under £5,000, a full rebuilt engine may not be economically viable - consider a used engine or scrap the car. If your car is worth £8,000+ (low mileage, M Sport spec, good condition), a reconditioned engine with warranty is a sound investment.

• Vehicle value is the key factor in the decision
• Used engines offer a budget-friendly alternative
• Rebuilt engines with warranty suit owners keeping the car 2+ years

A BMW 1 Series 125d engine replacement typically takes 2-3 days for a specialist to complete, including removal of the old N47/B47 unit and fitting the replacement. Timing chain replacement alone (without full engine removal) is a more complex job on the N47 due to the rear-mounted chain and typically takes 1-2 days.

• Supply-only: engine delivered next working day in many cases
• Supply and fit: allow 2-3 working days
• Mobile fitting options available through some specialists

Both the BMW 125d and 123d use 2.0-litre diesel engines, but the 125d replaced the 123d with more power. The 123d produced 204 hp, while the 125d produces 218-224 hp - 13 bhp and 50 lb ft more than its predecessor.

• 125d: 218-224 hp, 450 Nm torque, multi-stage turbocharging
• 123d: 204 hp, 400 Nm torque, twin-turbo

Yes - every rebuilt BMW 1 Series 125d engine supplied through EnginesMarket comes with a minimum 12-month unlimited-mileage warranty. This covers the engine against manufacturing defects and component failure, giving you peace of mind when investing in a replacement N47 or B47 twin-turbo unit.

• 12-month warranty is standard on all rebuilt engines
• Some specialists offer extended warranty options (6-24 months)
• Always confirm exact warranty terms with your chosen supplier