BMW 1 Series 125d Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW 1 Series 125d engine specialists. Compare prices on reconditioned, rebuilt and used engines for your BMW 125d - the 218 hp twin-turbo diesel that replaced the 123d as the performance diesel flagship of the 1 Series range. Covering the N47D20 and B47D20 engines across the F20 and F21 generations from 2012 to 2019.
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12-Month Warranty
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100+ Suppliers
From £1,250 to £4,800
Used from £1,250 · Reconditioned from £1,250 · Common codes: N47D20C, N47D20D, B47D20B
From £1,250
Tested, bare/short engine
From £1,250
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW 1 Series 125d Replacement Engineto Finding the Best BMW 1 Series 125d Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 1 Series 125d - Engine History & Specs at a Glance
The BMW 125d was launched in 2012 as the performance diesel flagship of the second-generation 1 Series range. It replaced the 123d and used a 2.0-litre twin-turbo diesel engine producing 218 hp - making it one of the most powerful production four-cylinder diesels available. The 125d combined the low running costs of a diesel with genuine hot-hatch performance, offering 450 Nm of torque and a 0-62 mph time of just 6.5 seconds. Production ran from 2012 to 2019 across the F20 (five-door) and F21 (three-door) body styles.
Variant HistoryBMW 1 Series 125d - Engine History & Specs at a Glance
The BMW 125d was launched in 2012 as the performance diesel flagship of the second-generation 1 Series range. It replaced the 123d and used a 2.0-litre twin-turbo diesel engine producing 218 hp - making it one of the most powerful production four-cylinder diesels available. The 125d combined the low running costs of a diesel with genuine hot-hatch performance, offering 450 Nm of torque and a 0-62 mph time of just 6.5 seconds. Production ran from 2012 to 2019 across the F20 (five-door) and F21 (three-door) body styles.
BMW 1 Series 125d
Fuel TypeDiesel
Engine Size2.0L (1,995 cc)
Power Output Range218-224 hp (160-165 kW)Engine History Timeline
N47D20C / N47D20D 2.0L twin-turbo diesel, 218 hp (160 kW), launched with the F20 five-door and F21 three-door 1 Series
B47D20B 2.0L twin-turbo diesel (Euro 6), 224 hp (165 kW), introduced as part of the F20/F21 LCI update
F20/F21 generation ends; the 125d badge is discontinued in the UK
Key Specs Snapshot
Fuel TypeDieselEngine Size2.0L (1,995 cc)Power Output Range218-224 hp (160-165 kW)Torque Range450 NmYears Produced2012-2019Every engine fitted to the BMW 1 Series 125d is covered below, with UK rebuilt pricing and known failure points.
BMW 1 Series 125d Engine Codes - Specifications & Replacement CostBMW 1 Series 125d Engine Codes - Specifications & Replacement Cost
2.0L Twin-Turbo Diesel (2012-2015)
Power Output218 hp (160 kW)Torque450 NmYears Fitted2012-2015
Compatible Trim Levels
- 125d
- 125d SE
- 125d Sport
- 125d Urban
- 125d M Sport (F20/F21)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£1,250-£1,800
Reconditioned
Addressed known issues, tested
£1,250-£2,200
Rebuilt
Full teardown, upgraded internals
£2,700-£4,800
Common Failure
The N47 engine family is notoriously prone to timing chain tensioner and guide failure. The timing chain is located at the rear of the engine, towards the gearbox - which reduces vibrations but makes any timing chain intervention much more complex and expensive. A rattling noise from the rear of the engine on cold start is the classic early warning sign. Typical failure mileage: 60,000-120,000 miles.
The BMW 1 Series 125d is powered by the 2.0-litre N47 and B47 twin-turbo diesel engines - producing 218-224 hp and 450 Nm of torque. While it was a landmark engine that put diesel performance on the map, the N47 family has a well-documented Achilles' heel: the timing chain system. Replacement demand for the BMW 125d is driven almost entirely by timing chain failure and, to a lesser extent, EGR and DPF issues. Every rebuilt engine supplied through EnginesMarket includes upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.
The N47's Achille's Heel
Affected Vehicles
BMW 1 Series 125d (N47D20C / N47D20D, 2012-2015)
Typical Failure Mileage
60,000-120,000 miles
Root Cause
The timing chain, its guides, and tensioners on BMW's N47 engines were poorly designed and constructed. The timing chain is located at the rear of the engine, towards the gearbox - this reduces vibrations but makes any timing chain intervention much more complex and expensive. A rattling noise from the rear of the engine on cold start is the most common early warning sign. Because the engine is of an interference type, a snapped timing chain can cause pistons to collide with valves - resulting in catastrophic engine failure.
Why It Happens
The timing chain, its guides, and tensioners on BMW's N47 engines were poorly designed and constructed. The timing chain is located at the rear of the engine, towards the gearbox - this reduces vibrations but makes any timing chain intervention much more complex and expensive. A rattling noise from the rear of the engine on cold start is the most common early warning sign. Because the engine is of an interference type, a snapped timing chain can cause pistons to collide with valves - resulting in catastrophic engine failure.
Dealer (parts + labour)
£1,500-£2,500
Specialist (parts + labour)
£1,000-£1,800
What it involves
Replace timing chain, tensioner, guides and sprockets - engine-out job on N47
Suitability
Best if caught early - rattle present but engine still running
1 - 2 daysDealer (parts + labour)
£4,000-£6,000
Specialist (parts + labour)
£2,700-£4,800 (matches Section 4 rebuilt pricing)
What it involves
Supply & fit, upgraded timing components, rebuilt turbos, 12-month warranty
Suitability
When chain has snapped or engine is already damaged
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Timing Chain Replacement (preventative) Minor | £1,500-£2,500 | £1,000-£1,800 | Replace timing chain, tensioner, guides and sprockets - engine-out job on N47 | Best if caught early - rattle present but engine still running | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £4,000-£6,000 | £2,700-£4,800 (matches Section 4 rebuilt pricing) | Supply & fit, upgraded timing components, rebuilt turbos, 12-month warranty | When chain has snapped or engine is already damaged | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 2012-2015 BMW 1 Series 125d is currently valued at approximately £5,000-£12,000 depending on mileage, condition and specification. This places the 125d in a bracket where a rebuilt engine can be a viable investment for well-maintained examples. If your 125d is worth under £5,000 and the engine has suffered catastrophic timing chain failure, evaluate scrap value first - replacement cost may approach or exceed the car's market value. For well-maintained, higher-spec examples (M Sport, low mileage) worth £8,000+, a reconditioned or rebuilt engine with warranty is a sound investment.
Our Recommendation
Our Recommendation
If you hear the characteristic rattling noise from the rear of the engine on cold start in your N47-powered BMW 125d, act immediately. A £1,000-£1,800 specialist timing chain replacement is far cheaper than a full engine rebuild. The N47 timing chain is a known weakness, and BMW revised the timing chain design multiple times. If the chain has already snapped, the repair bill often exceeds the car's value - in that scenario, compare rebuilt engine prices through EnginesMarket against the cost of replacing the car. For owners planning to keep their 125d for 2+ years, a reconditioned N47 with upgraded timing components and warranty offers genuine peace of mind.
Don't Let Engine Failure Write Off Your BMW 1 Series 125d
The N47 engine in your BMW 125d has a well-known timing chain weakness - but with the right specialist, this can be addressed before catastrophic failure occurs. Later B47-powered cars are more reliable but still benefit from regular maintenance and vigilance for EGR and oil leak issues. Whether you need a preventative timing chain replacement or a full rebuilt engine with upgraded components and a 12-month warranty, EnginesMarket connects you with vetted UK specialists who know the 125d inside out. Compare prices today and keep your BMW on the road.
Compare rebuilt N47D20D BMW 1 Series 125d engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW 1 Series 125d. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 1 Series 125d Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 1 Series 125d engine replacement cost-
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
Question 2What are the signs of timing chain failure in a BMW 125d-
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
Question 3Is it worth replacing the engine in a BMW 1 Series 125d-
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
Question 4How long does a BMW 1 Series 125d engine replacement take-
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
Question 5What's the difference between the BMW 125d and 123d-
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
Question 6Does a BMW 1 Series 125d rebuilt engine come with a warranty-
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
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