BMW 1 Series 120d Engine Replacement Compare Prices & Get Quotes

A BMW 1 Series 120d engine replacement typically costs £1,295-£3,200 for a reconditioned or rebuilt unit supply-only, depending on the engine code. With supply and fit, expect £2,300-£4,000 depending on the specialist and location.

• Used M47 engines: £750-£1,200
• Used N47 engines: £1,295-£1,800
• Reconditioned N47: £1,295-£1,850
• Rebuilt B47 with warranty: £2,400-£3,200

The most common warning signs of N47 timing chain failure in a BMW 1 Series 120d include a rattling noise from 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 difficult
• A snapped timing chain on an N47 engine usually means catastrophic engine damage

A 2007-2015 BMW 1 Series 120d is typically valued at £3,000-£8,000. If your 120d is worth under £4,500, a full rebuilt engine may not be economically viable - consider a used engine or scrap the car. If your car is worth £6,000+ (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 120d engine replacement typically takes 2-3 days for a specialist to complete, including removal of the old unit and fitting the replacement. Timing chain replacement alone (without full engine removal) can be completed in 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 120d and 118d use the same 2.0-litre diesel engine family but with different power outputs. The 118d produces 122-150 hp depending on generation, while the 120d produces 163-190 hp.

• Same engine families - many parts are interchangeable
• 118d: 122-150 hp, lower torque output
• 120d: 163-190 hp (depending on generation), higher torque output

Yes - every rebuilt BMW 1 Series 120d 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 M47, N47 or B47 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