How much does a BMW 325d engine replacement cost in the UK?

A reconditioned 325d engine costs £3,200–£6,000 supply only depending on generation. E90 M57/N57 straight-sixes start around £3,500; F30 N47 four-cylinders start around £3,200; G20 B47 units start around £3,400. Fitting adds £650–£1,500. Use our calculator for a figure specific to your car.

Is the BMW 325d engine reliable?

It depends entirely on which of the four engine generations your 325d has. The M57 (E90 pre-LCI) is a robust iron-block straight-six; the N57 (E90 LCI) is more refined but has rear-chain considerations; the N47 (F30 pre-LCI) is the well-documented rear-chain risk generation; the B47 (F30 LCI/G20) has the chain relocated to the front and is meaningfully improved. Check the Era Map above for your specific car.

What are the common problems with the BMW 325d?

Timing chain wear on N47 and N57 engines, swirl flap failure on the M57, and EGR cooler coolant leaks affecting N57 and N47 engines (subject to a BMW recall). The 325d badge spans multiple engine families, so the specific issues depend entirely on which generation you have.

Is it worth replacing a BMW 325d engine, or should I scrap the car?

Depends on vehicle value and which generation. Against a well-kept £10,000 325d, a £4,500 recon is 45% - worth it. Against a tired £4,000 example, the same recon exceeds our 70% BMW threshold - get a scrap valuation first.

How do I find my BMW 325d engine code?

Listed on the VIN plate and vehicle documentation. As a rule of thumb: E90 pre-LCI (2006–2008) is M57N2; E90 LCI (2008–2011) is N57D30U0; F30 pre-LCI (2011–2015) is N47D20D; F30 LCI/G20 (2015–present) is B47D20. The VIN is the only sure way - tell us your registration and we'll confirm it for free.

Can I repair the N47 timing chain, or does it need replacement?

Yes - if caught early. A preventative chain replacement (£650–£1,800) is far cheaper than a catastrophic chain snap (£3,200–£5,200 engine replacement). At the first sign of cold-start rattle, book an inspection immediately. For the N57, the same principle applies - less common but still a known pattern.

BMW 325d2006–present4 Engine Generations

BMW 325d Engine Replacement — Compare Prices & Get Quotes

Name: BMW 325d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW 3 Series specialists. Compare reconditioned, rebuilt and used M57, N57, N47 and B47 engines - supply & fit available nationwide.

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BMW 325d Engines - from £1,800 to £7,500Common codes: M57N2, N57D30U0, N47D20D, B47D20

BMW 325d Engines - from £1,800 to £7,500· Common codes: M57N2, N57D30U0, N47D20D, B47D20

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The 325d THROUGH TIME - Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

The original 325d - iron-block M57. Robust, but swirl flaps and thermostats are known weak points.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

E90 (pre-LCI) BMW 320d E90 (pre-LCI)

2006–2008M57N2 / 306D3 (3.0L Straight-Six Turbo Diesel)★★★★☆ [NEWLY ASSIGNED - see Data Note]£3,500–£5,500 [PLACEHOLDER - confirm vs cost sheet]The original 325d - iron-block M57. Robust, but swirl flaps and thermostats are known weak points.

E90 (LCI)

2008–2011N57D30U0 (3.0L Straight-Six Turbo Diesel)★★★★☆ [NEWLY ASSIGNED - see Data Note]£3,800–£6,000 [PLACEHOLDER]Alloy-block N57. More refined and better on fuel; rear timing chain, EGR and DPF need vigilance.

F30 (pre-LCI) BMW 320d F30 (pre-LCI)

2011–2015N47D20D (2.0L Four-Cylinder Turbo Diesel)★★★☆☆ 1,450 JLR-wide [BMW-VERIFIED - inherited from Model Page & F30 Generation Page]£3,200–£5,200 [BMW-QUOTE]The four-cylinder 325d - rear timing chain risk applies.

F30 (LCI) / G20 BMW 320d F30 (LCI) / G20

2015–presentB47D20 (2.0L Four-Cylinder Turbo Diesel)★★★★☆ [NEWLY ASSIGNED - see Data Note]£3,400–£5,800 [PLACEHOLDER]Chain relocated to the front - a genuinely different risk profile.

Why use this era map?

This table is the single source every other section on this page matches - Sections 2, 4 and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW 325d Engine Replacement Costs

Supply Only£3,400–£6,000

Fitted (Indie)£4,500–£7,300

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,800–£3,500£2,700–£4,8001–6 monthsBudget priority; vehicle under £5,000

Reconditioned Engine£3,400–£6,000£4,500–£7,30012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£5,000–£7,500£6,200–£8,80012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£8,000–£12,000£9,500–£14,00024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current G20/B47 generation, the most common quote request today. Older generations: see the Era Map above for E90/M57/N57 and F30/N47-specific pricing, which runs lower.

Labour estimate: Fitting a 325d engine typically takes 10–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

→ Compare 325d engine prices from UK specialists

Common Problems With BMW 320d Engines

1. N47 Rear Timing Chain Failure (F30 pre-LCI)

Symptoms: Cold-start rattle lasting 1–30 seconds, metallic ticking, engine warning light.

Typical mileage: 60,000–100,000 miles.

Repair cost: £650–£1,800 (preventative).

Replacement cost: £3,200–£5,200 (catastrophic).

🔴 Immediate - if you hear rattle, book an inspection today.

Our recommendation:

This applies to the four-cylinder N47-powered F30 325d (pre-LCI). At the first sign of cold-start rattle, get the chain inspected. A £650–£1,800 preventative repair is dramatically cheaper than the £3,200+ replacement that follows.

Read the full timing chain failure guide

1. N47 Rear Timing Chain Failure (F30 pre-LCI)

Symptoms: Cold-start rattle lasting 1–30 seconds, metallic ticking, engine warning light.

Typical mileage: 60,000–100,000 miles.

Repair cost: £650–£1,800 (preventative).

Replacement cost: £3,200–£5,200 (catastrophic).

🔴 Immediate - if you hear rattle, book an inspection today.

Our recommendation:

Read the full timing chain failure guide

2. N57 Timing Chain & EGR Cooler (E90 LCI)

Symptoms: Rattling noise on cold start (timing chain), coolant loss with white smoke (EGR cooler), engine warning light.

Typical mileage: 60,000–120,000 miles.

Repair cost: £800–£1,800 (chain) / £400–£800 (EGR cooler)【PLACEHOLDER - confirm vs cost sheet】

Replacement cost: £3,800–£6,000 (if chain snaps)

🔴 Immediate - if you hear rattle or see coolant loss, book an inspection today.

Our recommendation:

The N57 has a rear-mounted timing chain design similar to the N47 - it's less prone to failure than the four-cylinder but still a known pattern on neglected oil changes. The EGR cooler recall (2018–2019) affected many N57-equipped vehicles. Verify recall completion before buying an LCI E90 325d.

Read the full timing chain failure guide

3. Swirl Flap Failure (M57 E90 pre-LCI)

Symptoms: Loss of power, rough idle, engine warning light, occasional rattling from the intake.

Typical mileage: 80,000–150,000 miles.

Repair cost: £100–£250 (preventative blanking plates).

Replacement cost: £850–£1,200 (intake manifold, or engine repair if debris entered a cylinder).

🟡 Monitor - book inspection soon.

Our recommendation:

The M57 is a robust engine, but swirl flaps are its Achilles heel. Preventive blanking is cheap and effective. This applies to E90 pre-LCI 325d with the M57 engine only - the N57 does not suffer from swirl flap issues.

Read the full swirl flap failure guide

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325d - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

325d - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseN47 timing chain rattle (F30 pre-LCI)✅ Yes£650–£1,800Preventative - catches the fault before catastrophic failureN57 timing chain wear (E90 LCI)✅ Yes£800–£1,800Preventative - less common than N47 but still a patternSwirl flap failure (M57)✅ Yes£100–£250Blanking plates remove the risk entirelyEGR cooler leak (N57/N47)✅ Yes£400–£800Straightforward fix; recall may cover itSnapped timing chain❌ Usually NoEngine replacementPiston-valve contact means little is left to repair

Buying This 325d? Check These First

Buy If

E90 pre-LCI: Documented swirl flap blanking or replacement
E90 LCI: Confirmed EGR recall completion and timing chain inspection
F30 pre-LCI: Documented timing-chain history
Any generation: Full service history with sub-15,000km oil intervals

Avoid If

E90 pre-LCI: No proof of swirl flap work
E90 LCI: Cold-start rattle or EGR cooler failure with no documented repair
F30 pre-LCI: Cold-start rattle and no chain history
Any generation: Poor service history - these engines are unforgiving of neglect

Closing Verdict

The 325d is one of the most confusing badges in BMW's modern lineup - it started as a 3.0-litre straight-six, then became a 2.0-litre four-cylinder. The M57 and N57 straight-sixes are the purist's choice; the N47 and B47 four-cylinders are the modern economy option. Buy the engine that matches your priorities - but buy on documented history, not on faith, regardless of which generation you choose.

Don't guess.Get the right engine at the right price.

→ Compare 325d engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare 325d engine prices before you buy

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Buying Checklist

Before you buy a used BMW 325d (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattle (N47/N57 timing chain warning; M57 swirl flap warning)

Service History

including which engine era (M57/N57/N47/B47) and confirmed oil-interval discipline

Smoke Check

White smoke on startup can indicate EGR coolant leak (N57/N47)

Swirl Flap Check (M57)

Have swirl flaps been blanked or replaced?

DPF Regeneration

Check history; short journeys accelerate wear on all diesel eras

Oil Consumption

Does it use more than 1L per 1,000 miles?

Engine Warning Light

Have codes been read? Any unresolved issues?

MOT History

Check for emissions-related failures

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

BMW 320d Engine Codes

This table's rows match Section 1B's Era Map exactly.

M57N2 / 306D3

Years2006–2008

Power197 bhp (145 kW) @ 4,000 rpm · 400 Nm @ 1,300–3,250 rpm

2025 Enquiries- (pattern data)

Avg. Recon Cost£3,500–£5,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M57N2 / 306D32006–2008197 bhp (145 kW) @ 4,000 rpm · 400 Nm @ 1,300–3,250 rpm- (pattern data)£3,500–£5,500 [PLACEHOLDER]

N57D30U02008–2011204 bhp (150 kW) @ 4,000 rpm · 430 Nm @ 1,750–2,500 rpm- (pattern data)£3,800–£6,000 [PLACEHOLDER]

N47D20D2011–2015218 bhp (160 kW) @ 4,400 rpm · 450 Nm @ 1,500–2,500 rpm1,450 JLR-wide [BMW-VERIFIED]£3,200–£5,200 [BMW-QUOTE]

B47D202015–present224 bhp (165 kW) @ 4,400 rpm · 450 Nm @ 1,500–2,500 rpm- (pattern data)£3,400–£5,800 [PLACEHOLDER]

Technical Specs

M57N2Displacement: 2,993cc · Cylinders: Straight-6 · Compression: 17.0:1 · Fuel: Common-rail · Turbo: Single VGT

N57D30U0Displacement: 2,993cc · Cylinders: Straight-6 · Compression: 16.5:1 · Fuel: Common-rail · Turbo: Single VGT

N47D20DDisplacement: 1,995cc · Cylinders: 4-cylinder · Compression: 16.5:1 · Fuel: Common-rail · Turbo: Single VGT

B47D20Displacement: 1,995cc · Cylinders: 4-cylinder · Compression: 16.5:1 · Fuel: Common-rail · Turbo: Single VGT

→ Compare 325d engine prices for your BMW

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Market Intelligence

Most Common Failure

N47 rear timing chain (F30 pre-LCI)

65%

of four-cylinder 325d enquiries

[PATTERN DATA]

Average Enquiry Mileage

80,000

–110,000 miles

[PATTERN DATA]

Average Replacement Cost

£4,300

reconditioned, supply only

[BMW-QUOTE]

Most Requested Engine Code

N47D20D (F30)

[BMW-VERIFIED]

Peak Enquiry Season

Winter

cold starts expose chain and swirl-flap issues

[PATTERN DATA]

Regional Demand

London22%

South East18%

North West12%

PATTERN DATA

Regional Demand Breakdown

22%London

18%South East

12%North West

BMW 320d - Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty - always confirm terms with your chosen supplier.

Why UK BMW 325d Owners Trust BMWEngines.uk

Trusted 325d Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 325d owners, as part of the Engine Finders network, across every engine era - from the M57 straight-six to the B47 four-cylinder, and everything in between.
Compare 325d Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit, across every generation of this badge, regardless of whether you have the straight-six or four-cylinder.
UK Engine Replacement Services for 325d
supply-only or full supply & fit available nationwide, covering every 3 Series generation that wore the 325d badge - and we're vetted across every engine family, from M57 to B47.

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12-Month Warranty

As standard

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