BMW 4 Series 425d Engine ReplacementCompare Prices & Get Quotes
Get quotes today for your BMW 4 Series 425d engine replacement from trusted UK BMW 425d engine specialists. Compare prices on reconditioned, rebuilt and used engines for the BMW 4 Series 425d - all with verified compatibility and UK-wide supply.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £3,800 to £5,800
Used from £1,800 · Reconditioned from £3,200 · Common codes: N47D20D, B47D20B
From £1,800
Tested, bare/short engine
From £3,200
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
Secure enquiry - no spam, no pressure. Genuine quotes only from vetted UK BMW 4 Series 425d specialists.
3 Simple Steps3 Simple Stepsto Finding the Best BMW 4 Series 425d Replacement Engineto Finding the Best BMW 4 Series 425d Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 4 Series 425d - Engine History & Specs at a Glance
The BMW 425d joined the 4 Series range as a power-oriented diesel variant, sitting above the 420d and below the six-cylinder 430d/435d. Over its production life, the 425d moved from the N47 to the more robust B47 engine family, bringing improved emissions compliance and reliability.
Variant HistoryBMW 4 Series 425d - Engine History & Specs at a Glance
The BMW 425d joined the 4 Series range as a power-oriented diesel variant, sitting above the 420d and below the six-cylinder 430d/435d. Over its production life, the 425d moved from the N47 to the more robust B47 engine family, bringing improved emissions compliance and reliability.
BMW 4 Series 425d
Fuel TypeDiesel
Engine Size Range2.0L (1995cc)
Power Output Range218-224hp across the variant's historyEngine History Timeline
N47D20D 2.0L turbo diesel, 218hp, launch of the F32 Coupé 425d
B47D20B 2.0L turbo diesel, 224hp, introduced as the Euro 6-compliant replacement
B47D20B continues across F32/F33/F36 body styles with 224hp output
425d badge discontinued with the G22 generation; the 420d became the sole four-cylinder diesel offering
Key Specs Snapshot
Fuel TypeDieselEngine Size Range2.0L (1995cc)Power Output Range218-224hp across the variant's historyYears Produced2013-2020Every engine fitted to the BMW 4 Series 425d is covered below, with UK rebuilt pricing and known failure points.
BMW 4 Series 425d Engine Codes - Specifications & Replacement CostBMW 4 Series 425d Engine Codes - Specifications & Replacement Cost
2.0L Diesel (2013-2016)
Power Output218hpYears Fitted2013-2016
Compatible Trim Levels
- 425d SE
- 425d Sport
- 425d M Sport
- 425d xDrive (four-wheel drive adds approximately 1 hour to fitting labour)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£1,800-£3,200
Reconditioned
Addressed known issues, tested
£3,200-£5,500
Rebuilt
Full teardown, upgraded internals
£4,500-£6,500
Common Failure
N47 timing chain stretch and tensioner failure - the rear-mounted chain design is a known weakness. Cold-start rattle is the primary early warning; catastrophic engine damage follows if ignored. Typically occurs between 60,000-120,000 miles.
The BMW 425d's 2.0-litre diesel engines are broadly dependable, but two distinct failure patterns dominate replacement demand. Early N47D20D-equipped cars suffer the notorious timing-chain weakness, while later B47D20B cars see EGR cooler failures. Rebuilt engines through EnginesMarket include upgraded components addressing the original failure point, plus a minimum 12-month unlimited-mileage warranty.
Why the BMW 4 Series 425d N47D20D Wears Prematurely
Affected Vehicles
BMW 4 Series 425d (N47D20D, 2013-2016)
Typical Failure Mileage
60,000-120,000 miles
Root Cause
The rear-mounted timing chain and plastic tensioner guides are prone to stretch and wear. Poor oil maintenance accelerates the issue. A cold-start rattle is the classic warning sign; ignoring it leads to valve and piston collision, destroying the engine.
Why It Happens
The rear-mounted timing chain and plastic tensioner guides are prone to stretch and wear. Poor oil maintenance accelerates the issue. A cold-start rattle is the classic warning sign; ignoring it leads to valve and piston collision, destroying the engine.
Dealer (parts + labour)
£1,800-£3,500
Specialist (parts + labour)
£650-£1,800
What it involves
Replace chain, tensioner, guides; oil system flush
Suitability
Prevents catastrophic failure if caught early; buys another 60k+ miles
1 - 2 daysDealer (parts + labour)
£6,500-£9,500
Specialist (parts + labour)
£4,500-£6,500 (matches Section 4 rebuilt price)
What it involves
Supply & fit, upgraded components addressing original failure point, 12-month warranty
Suitability
The right call if chain has already snapped or engine is high-mileage with multiple issues
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 Minor | £1,800-£3,500 | £650-£1,800 | Replace chain, tensioner, guides; oil system flush | Prevents catastrophic failure if caught early; buys another 60k+ miles | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £6,500-£9,500 | £4,500-£6,500 (matches Section 4 rebuilt price) | Supply & fit, upgraded components addressing original failure point, 12-month warranty | The right call if chain has already snapped or engine is high-mileage with multiple issues | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical BMW 4 Series 425d (2013-2016) sits in the £8,000-£18,000 bracket. At this value, a reconditioned or rebuilt engine (£4,500-£6,500) represents a viable investment if you plan to keep the car for two or more years. For sub-£8,000 examples, evaluate whether a used engine or targeted chain repair offers better value.
Our Recommendation
Our Recommendation
If your N47-powered 425d has a timing chain rattle but the engine is otherwise healthy, the specialist chain replacement is the sensible first step - it costs a fraction of a full rebuild and restores reliability. If the chain has already snapped or the car has covered over 140,000 miles, a rebuilt engine with upgraded components is the more cost-effective long-term answer.
Don't Let Engine Failure Write Off Your BMW 4 Series 425d
Whether your 425d is an early N47 car with timing-chain concerns or a later B47 with EGR cooler issues, EnginesMarket connects you with vetted UK specialists who supply rebuilt engines with upgraded components and a minimum 12-month unlimited-mileage warranty. Compare prices, choose supply & fit, and get your BMW 4 Series 425d back on the road with confidence.
Compare rebuilt N47D20D BMW 4 Series 425d 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 4 Series 425d. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 4 Series 425d Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 4 Series 425d engine replacement cost in the UK-
A BMW 4 Series 425d engine replacement typically costs £3,800-£6,500 for a rebuilt unit, £2,800-£5,500 for reconditioned, or £1,500-£3,200 for a used engine (supply-only). Fitting adds £650-£910 at a specialist, depending on xDrive complexity.
- Rebuilt engines include upgraded components addressing the original failure point
- 12-month unlimited-mileage warranty is standard on all rebuilt units
- Supply & fit available through our UK-wide specialist network
Question 2What are the signs of timing chain failure in a BMW 4 Series 425d-
The most common warning sign is a rattling or clattering noise from the engine on cold start, which may fade as the engine warms up. Other symptoms include rough idling, reduced performance, and the check engine light illuminating.
- N47-equipped 425d models (2013-2016) are most affected
- Chain stretch typically becomes audible between 60,000-120,000 miles
- Ignoring the rattle can lead to catastrophic engine failure
Question 3Is it worth replacing the engine in a BMW 4 Series 425d-
For a 425d worth £8,000-£18,000, a rebuilt engine at £3,800-£6,500 is a viable investment if you plan to keep the car for two or more years. For sub-£8,000 examples, evaluate a used engine or targeted repair first.
- Rebuilt engines come with a 12-month warranty and upgraded components
- Compare three quotes before committing - pricing varies significantly between suppliers
- Supply & fit removes the hassle of finding a specialist yourself
Question 4How long does a BMW 4 Series 425d engine replacement take-
A typical BMW 4 Series 425d engine replacement takes 2-3 days from order to delivery for the engine unit itself. Supply & fit adds 10-14 hours of workshop labour for a 2.0-litre diesel, depending on xDrive complexity.
- Same-day dispatch available on many used and reconditioned units
- Most specialists complete the fit within 2-3 working days
- Nationwide delivery means you're not limited to local suppliers
Question 5What's the difference between the BMW 425d and 420d engines-
The BMW 425d uses the same 2.0-litre diesel block as the 420d but with a more powerful factory tune - 218-224hp versus 184-190hp. Early 425d models used the N47D20D engine; later models switched to the B47D20B with Euro 6 compliance.
- 425d power output: 218hp (N47) or 224hp (B47)
- Both share the same 2.0L displacement and four-cylinder layout
- Engine codes are not interchangeable - verify your unit before ordering
Question 6Does a replacement engine affect my BMW 4 Series 425d's MOT-
A correctly fitted replacement engine that meets the original emissions specification will not affect your MOT. All B47D20B engines are Euro 6 compliant; N47D20D engines meet Euro 5 standards.
- Ensure the replacement engine matches your car's original emissions class
- Your specialist will provide emissions documentation with the fit
- A like-for-like replacement is fully MOT-legal
Why Choose UsCompare BMW 4 Series 425dEngine PricesToday
1,200+ 4 Series engines supplied through our network
12-Month Warranty on every rebuilt BMW 425d engine
Nationwide UK delivery
supply & fit available
Comparing quotes for your BMW 4 Series 425d engine replacement is completely free and carries no obligation. Just enter your registration, tell us your engine code (N47D20D or B47D20B), and receive tailored prices from vetted UK specialists who stock the right unit for your exact variant. No spam, no pressure - just transparent pricing and a 12-month warranty on every rebuilt engine.
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