Engines Market

BMW 123d SPECIALISTS

BMW 1 Series 123d Engine Replacement Compare 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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BMW 1 Series 123d Engine
from£1,250 to £4,800
  • Usedfrom £1,250
  • Reconditionedfrom £1,250
  • Common codesN47D20B, N47D20D, N47D20T0
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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

BMW 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
  1. 2007

    N47D20B, 2.0L twin-turbo diesel, 204 hp (150 kW), launched with the facelifted E87 and E81 1 Series

  2. 2007

    E82 coupe and E88 convertible join the 123d line-up later in the year

  3. 2008

    123d becomes available across the full first-generation 1 Series range

  4. 2011

    Engine code variants include N47D20D and N47D20T0; continues production

  5. 2013

    First-generation 1 Series production ends; the 123d badge is retired and not carried over to the F20/F21 generation

Every engine fitted to the BMW 1 Series 123d is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW 1 Series 123d Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

N47D20B — 2.0L Twin-Turbo Diesel (2007-2008) engine

N47D20B — 2.0L Twin-Turbo Diesel (2007-2008)

Power Output
204 hp (150 kW)
Torque
400 Nm
Years Fitted
2007-2008

Can’t find your exact engine code?-> Get quotes for N47D20B BMW 1 Series 123d engine replacement

-> Get quotes for N47D20B BMW 1 Series 123d engine replacement

Common Problems

BMW 1 Series 123d Engine Problems Repair Cost vs Replacement

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.

Common failure points and repair options

Timing Chain Tensioner & Guide Failure

Affected
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.

Repair options

Repair tierDealer priceSpecialist price
Timing Chain Replacement (preventative)£1,500-£2,500£1,000-£1,800
Full Replacement - rebuilt/reconditioned engine£4,000-£6,000£2,800-£4,800 (matches Section 4 rebuilt pricing)
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.
-> Compare rebuilt N47D20T0 BMW 1 Series 123d engine prices

Twin-Turbo System Wear

Affected
BMW 1 Series 123d (N47D20, higher-mileage examples, 2007-2013)
Typical failure mileage
80,000-150,000 miles
Root cause
The 123d uses a sequential twin-turbo system - a small turbo for low-down response and a larger turbo for top-end power. Low-down boost issues and small turbo wear are common faults on older models. Symptoms include surging and bouncing through the rev range under low load and low rpm, loss of low-end power, and intermittent boost issues.

Repair options

Repair tierDealer priceSpecialist price
Turbo Actuator Repair / Replacement£500-£900£300-£600
Small Turbo Replacement£1,200-£2,000£800-£1,500
Full Replacement - rebuilt engine£4,000-£6,000£2,800-£4,800
Our recommendation
Twin-turbo issues on the 123d are usually repairable without replacing the entire engine. Start with a diagnostic check - a sticky turbo actuator or vacuum leak is often the culprit and can be fixed for a few hundred pounds. If the small turbo itself has failed, replacement is significantly cheaper than a full engine rebuild. However, if the engine is also showing signs of timing chain wear, consider the cumulative repair cost against a rebuilt engine with warranty.
-> Compare rebuilt BMW 1 Series 123d engine prices

EGR Valve, DPF and Injector Issues

Affected
BMW 1 Series 123d (N47D20, 2007-2013)
Typical failure mileage
50,000-120,000 miles
Root cause
Like all modern diesels, the N47 can suffer from EGR valve and cooler failure, Diesel Particulate Filter (DPF) clogging (especially on short-trip cars), and injector problems. EGR-related drivability complaints are common on the N47.

Repair options

Repair tierDealer priceSpecialist price
EGR Cooler Replacement£600-£1,000£400-£700
DPF Cleaning / Replacement£500-£1,200£300-£800
Fuel Injector Replacement£600-£1,200£400-£800
Full Replacement - rebuilt engine£4,000-£6,000£2,800-£4,800
Our recommendation
EGR and DPF issues on the 123d are typically repairable without engine replacement. Check whether your vehicle is affected by the BMW diesel recall - if so, EGR-related repairs may be free at a main dealer. For DPF issues, ensure you're giving your 123d regular motorway runs to allow the DPF to regenerate. Injector problems can be diagnosed with a simple diagnostic scan - replace faulty units individually.
-> Compare rebuilt BMW 1 Series 123d engine prices

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.

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FAQ

BMW 1 Series 123d Engine ReplacementFrequently Asked Questions

Everything BMW 1 Series 123d owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

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Comparing quotes for your BMW 1 Series 123d engine replacement is completely free and carries no obligation. Enter your registration above, tell us your preferred engine condition - used, reconditioned or rebuilt - and receive tailored quotes from vetted UK specialists who know the N47 twin-turbo diesel inside out. No spam, no pressure, just genuine prices from trusted BMW 123d experts.

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