BMW 1 Series 118d Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW 1 Series 118d engine specialists. Compare prices on reconditioned, rebuilt and used engines for your BMW 118d - covering the 2.0-litre N47D20 four-cylinder diesel across the E8x and F20/F21 generations, through to the B47D20 and B47C20 units in later F20/F21 LCI and F40 models.
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12-Month Warranty
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100+ Suppliers
From £1,250 to £2,800
Used from £1,250 · Reconditioned from £1,250 · Common codes: N47D20A, N47D20B, N47D20C, N47D20D, B47D20A, B47C20A
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 118d Replacement Engineto Finding the Best BMW 1 Series 118d Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 1 Series 118d - Engine History & Specs at a Glance
The BMW 118d has been the core diesel model across three generations of the 1 Series in the UK. Launched with the first-generation E87 in 2004, it has evolved through the N47 and B47 engine families - always using a 2.0-litre four-cylinder turbo diesel that offers the perfect balance of performance and economy. The 118d badge represents the diesel sweet spot in the 1 Series range, delivering strong torque and excellent fuel efficiency without the running costs of the more powerful 120d.
Variant HistoryBMW 1 Series 118d - Engine History & Specs at a Glance
The BMW 118d has been the core diesel model across three generations of the 1 Series in the UK. Launched with the first-generation E87 in 2004, it has evolved through the N47 and B47 engine families - always using a 2.0-litre four-cylinder turbo diesel that offers the perfect balance of performance and economy. The 118d badge represents the diesel sweet spot in the 1 Series range, delivering strong torque and excellent fuel efficiency without the running costs of the more powerful 120d.
BMW 1 Series 118d
Fuel TypeDiesel
Engine Size Range2.0L (1,995 cc) across all production
Power Output Range122-150 hp across the variant's historyEngine History Timeline
M47N2 2.0L turbo diesel, 122 hp, launched with the E87 five-door and E81 three-door 1 Series
N47D20A / N47D20B 2.0L turbo diesel, 143 hp, introduced with the E87/E81 LCI update
N47D20C / N47D20D 2.0L turbo diesel, 143 hp, carried over into the second-generation F20/F21 1 Series
B47D20A 2.0L turbo diesel (Euro 6), 150 hp, introduced as part of the F20/F21 LCI update
F40 generation launches with B47C20A 2.0L turbo diesel, 150 hp, continuing the 118d badge
Current F70 generation continues with updated B-series diesel engines
Key Specs Snapshot
Fuel TypeDieselEngine Size Range2.0L (1,995 cc) across all productionPower Output Range122-150 hp across the variant's historyYears Produced2004-presentEvery engine fitted to the BMW 1 Series 118d is covered below, with UK rebuilt pricing and known failure points.
BMW 1 Series 118d Engine Codes - Specifications & Replacement CostBMW 1 Series 118d Engine Codes - Specifications & Replacement Cost
2.0L Turbo Diesel (2004-2007)
Power Output122 hp (90 kW)Years Fitted2004-2007
Compatible Trim Levels
- 118d
- 118d SE
- 118d Sport
- 118d M Sport (E81/E87)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£750-£1,000
Reconditioned
Addressed known issues, tested
£1,250-£1,600
Rebuilt
Full teardown, upgraded internals
£1,700-£2,200
Common Failure
The M47 is generally more reliable than its successor, but high-mileage examples can suffer from turbocharger wear and injector issues. Regular oil changes are critical - the timing chain is at the front of the engine and more accessible than on the N47.
The BMW 1 Series 118d has been powered by four different diesel engines across its production life. Early cars (2004-2007) use the M47N2 - a generally reliable unit with fewer major failure points. The N47D20 engines (2007-2015) are infamous for timing chain failure - a well-documented weakness that has affected countless BMW diesel owners. Later B47-powered cars (2015-present) are more reliable, with the timing chain moved to the front of the engine, but they have their own issues including oil leaks and EGR problems. Replacement demand for the BMW 118d is driven primarily by N47 timing chain failure. Every rebuilt engine supplied through EnginesMarket includes upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.
Why the BMW 1 Series 118d N47 Engine Fails Prematurely
Affected Vehicles
BMW 1 Series 118d (N47D20A / N47D20B / N47D20C / N47D20D, 2007-2015)
Typical Failure Mileage
60,000-100,000 miles
Root Cause
The timing chain system on the N47 engine is positioned at the rear, away from regular service reach. The original tensioner was too short, allowing the chain to become slack and rub against the guides. When the timing chain does snap, it causes catastrophic engine failure - the pistons lose timing and hit the valves, bending them and damaging the rocker arms.
Why It Happens
The timing chain system on the N47 engine is positioned at the rear, away from regular service reach. The original tensioner was too short, allowing the chain to become slack and rub against the guides. When the timing chain does snap, it causes catastrophic engine failure - the pistons lose timing and hit the valves, bending them and damaging the rocker arms.
Dealer (parts + labour)
£1,200-£1,800
Specialist (parts + labour)
£800-£1,300
What it involves
Replace timing chain, tensioner, guides and sprockets
Suitability
Best if caught early - rattle present but engine still running
1 - 2 daysDealer (parts + labour)
£3,200-£4,800
Specialist (parts + labour)
£2,300-£3,500 (matches Section 4 rebuilt pricing)
What it involves
Supply & fit, upgraded timing components, 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 | £1,200-£1,800 | £800-£1,300 | Replace timing chain, tensioner, guides and sprockets | Best if caught early - rattle present but engine still running | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £3,200-£4,800 | £2,300-£3,500 (matches Section 4 rebuilt pricing) | Supply & fit, upgraded timing components, 12-month warranty | When chain has snapped or engine is already damaged | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 2007-2015 BMW 1 Series 118d is currently valued at approximately £2,700-£5,200 depending on mileage, condition and generation. This places the 118d in the "repair or used engine typically makes more sense than a full rebuilt unit" bracket for lower-value examples. If your 118d is worth under £4,000 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, later generation) worth £5,500+, a reconditioned or rebuilt engine with warranty is a viable investment.
Our Recommendation
Our Recommendation
If you hear the characteristic rattling noise from the timing chain on cold start in your N47-powered BMW 118d, act immediately. An £800-£1,300 specialist timing chain replacement is far cheaper than a full engine rebuild. 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 118d 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 118d
The N47 engine in your BMW 118d 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 oil leaks and EGR 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 118d inside out. Compare prices today and keep your BMW on the road.
Compare rebuilt N47D20C BMW 1 Series 118d 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 118d. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 1 Series 118d Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 1 Series 118d engine replacement cost-
A BMW 1 Series 118d engine replacement typically costs £1,250-£2,800 for a reconditioned or rebuilt unit supply-only, depending on the engine code. With supply and fit, expect £2,300-£3,800 depending on the specialist and location.
- Used M47 engines: £750-£1,000
- Used N47 engines: £1,250-£1,700
- Reconditioned N47: £1,250-£1,850
- Rebuilt B47 with warranty: £2,200-£2,800
Question 2What are the signs of timing chain failure in a BMW 118d-
The most common warning signs of N47 timing chain failure in a BMW 1 Series 118d 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
Question 3Is it worth replacing the engine in a BMW 1 Series 118d-
A 2007-2015 BMW 1 Series 118d is typically valued at £2,700-£5,200. If your 118d is worth under £4,000, a full rebuilt engine may not be economically viable - consider a used engine or scrap the car. If your car is worth £5,500+ (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 118d engine replacement take-
A BMW 1 Series 118d 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
Question 5What's the difference between the BMW 118d and 120d-
Both the BMW 118d and 120d 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 more power (up to 190 hp in later models).
- Same engine families - many parts are interchangeable
- 118d: 122-150 hp, lower torque output
- 120d: 163-190 hp (depending on generation), higher torque output
Question 6Does a BMW 1 Series 118d rebuilt engine come with a warranty-
Yes - every rebuilt BMW 1 Series 118d 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
- Always confirm exact warranty terms with your chosen supplier
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