BMW 1 Series 123d Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW 1 Series 123d engine specialists. Compare prices on reconditioned, rebuilt and used engines for your BMW 123d - the 204 hp twin-turbo diesel that made the 1 Series a performance icon. Covering the N47D20 engine across the E81, E82, E87 and E88 generations from 2007 to 2013.
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From turbo) - from £1,250 to £4,800
Used from £1,250 · Reconditioned from £1,250 · Common codes: N47D20B, N47D20D, N47D20T0
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 123d Replacement Engineto Finding the Best BMW 1 Series 123d Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 1 Series 123d - Engine History & Specs at a Glance
The BMW 123d was launched in 2007 as the performance diesel flagship of the first-generation 1 Series range. It was the first production diesel on sale to achieve a specific output of over 100 bhp per litre, using twin-turbo technology first shown in the E60 535d. The 123d combined the low running costs of a diesel with hot-hatch performance - a 204 bhp 2.0-litre twin-turbo that could genuinely embarrass petrol GTi rivals. Production ran from 2007 to 2013 across the E81 (three-door), E82 (coupe), E87 (five-door) and E88 (convertible) body styles.
Variant HistoryBMW 1 Series 123d - Engine History & Specs at a Glance
The BMW 123d was launched in 2007 as the performance diesel flagship of the first-generation 1 Series range. It was the first production diesel on sale to achieve a specific output of over 100 bhp per litre, using twin-turbo technology first shown in the E60 535d. The 123d combined the low running costs of a diesel with hot-hatch performance - a 204 bhp 2.0-litre twin-turbo that could genuinely embarrass petrol GTi rivals. Production ran from 2007 to 2013 across the E81 (three-door), E82 (coupe), E87 (five-door) and E88 (convertible) body styles.
BMW 1 Series 123d
Fuel TypeDiesel
Engine Size2.0L (1,995 cc)
Power Output204 hp (150 kW) @ 4,400 rpmEngine History Timeline
N47D20B 2.0L twin-turbo diesel, 204 hp (150 kW), launched with the facelifted E87 and E81 1 Series
E82 coupe and E88 convertible join the 123d line-up later in the year
123d becomes available across the full first-generation 1 Series range
Engine code variants include N47D20D and N47D20T0; continues production
First-generation 1 Series production ends; the 123d badge is retired and not carried over to the F20/F21 generation
Key Specs Snapshot
Fuel TypeDieselEngine Size2.0L (1,995 cc)Power Output204 hp (150 kW) @ 4,400 rpmTorque400 Nm @ 2,000-2,250 rpmYears Produced2007-2013Every engine fitted to the BMW 1 Series 123d is covered below, with UK rebuilt pricing and known failure points.
BMW 1 Series 123d Engine Codes - Specifications & Replacement CostBMW 1 Series 123d Engine Codes - Specifications & Replacement Cost
2.0L Twin-Turbo Diesel (2007-2008)
Power Output204 hp (150 kW)Torque400 NmYears Fitted2007-2008
Compatible Trim Levels
- 123d
- 123d SE
- 123d Sport
- 123d M Sport (E81/E87)
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
£2,500-£4,800
Common Failure
The N47 engine family is notoriously prone to timing chain tensioner and guide failure. The timing chain is located on the rear side 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 123d is powered exclusively by the N47D20 twin-turbo diesel engine - a 2.0-litre four-cylinder that produces 204 hp and 400 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 123d is driven almost entirely by timing chain failure and, to a lesser extent, twin-turbo system wear. Every rebuilt engine supplied through EnginesMarket includes upgraded timing 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 123d (N47D20B / N47D20D / N47D20T0, 2007-2013)
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 on the rear side 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. In some cases, the chain has been known to explode through the rear engine casing.
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 on the rear side 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. In some cases, the chain has been known to explode through the rear engine casing.
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)
£2,800-£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 | £2,800-£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 2007-2013 BMW 1 Series 123d is currently valued at approximately £4,000-£10,000 depending on mileage, condition and body style (coupe and convertible models command a premium). If your 123d 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, lower-mileage examples (especially M Sport coupes) worth £7,000+, a reconditioned or rebuilt engine with warranty is a viable investment.
Our Recommendation
Our Recommendation
If you hear the characteristic rattling noise from the rear of the engine on cold start in your BMW 123d, 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 extended the warranty on timing chain components for some models, but don't rely on this - especially if the car has part-service history. 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 123d 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 123d
The N47 twin-turbo engine in your BMW 123d is a landmark diesel performance engine - but it has a well-known timing chain weakness that can be addressed before catastrophic failure occurs. Whether you need a preventative timing chain replacement or a full rebuilt engine with upgraded timing components, reconditioned turbos and a 12-month warranty, EnginesMarket connects you with vetted UK specialists who know the 123d inside out. Compare prices today and keep your BMW on the road.
Compare rebuilt N47D20T0 BMW 1 Series 123d 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 123d. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 1 Series 123d Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 1 Series 123d engine replacement cost-
A BMW 1 Series 123d engine replacement typically costs £1,250-£4,800 for a reconditioned or rebuilt unit supply-only, depending on the condition and specification. With supply and fit, expect £2,800-£6,000 depending on the specialist and location.
- Used N47D20 engines: £1,250-£2,000
- Reconditioned N47D20: £1,250-£2,300
- Rebuilt N47D20 with warranty: £2,600-£4,800
Question 2What are the signs of timing chain failure in a BMW 123d-
The most common warning signs of N47 timing chain failure in a BMW 1 Series 123d 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 123d-
A 2007-2013 BMW 1 Series 123d is typically valued at £4,000-£10,000. If your 123d 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 £7,000+ (low mileage, M Sport or coupe 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 123d engine replacement take-
A BMW 1 Series 123d engine replacement typically takes 2-3 days for a specialist to complete, including removal of the old N47 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 123d and 120d-
Both the BMW 123d and 120d use the same 2.0-litre N47 diesel engine family, but with very different specifications. The 123d uses a sequential twin-turbo system producing 204 hp and 400 Nm of torque, while the 120d uses a single variable-geometry turbo producing 177-184 hp.
- 123d: 204 hp, 400 Nm, twin-turbo
- 120d: 177-184 hp, lower torque output, single turbo
Question 6Does a BMW 1 Series 123d rebuilt engine come with a warranty-
Yes - every rebuilt BMW 1 Series 123d 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 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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