BMW 320d1998–present4 Engine Generations

BMW 320d Engine Replacement —Compare Prices &
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Name: BMW 320d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW 320d specialists. Compare reconditioned, rebuilt and used M47, N47 and B47 engines — supply & fit available nationwide.

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BMW 320d Engines — from £1,800 to £7,000Common codes: M47TU2, N47D20C, B47D20

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The 320d Through Time — Era Map

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

Era Note

Widely regarded as one of BMW's most durable diesels — no rear-chain risk. Swirl flaps (150bhp variant, 2001+) are the one real weak point.

Era Note

The defining rear-mounted timing-chain generation. See the full E90 Generation Page for the M57/N57 diesel-six story alongside this engine.

Era Note

BMW's 2011 chain revision improved on the E90 N47 but didn't eliminate the rear-chain risk. The 2015/16 facelift replaced it entirely with the B47 — chain relocated to the front, a genuinely different risk profile.

Era Note

The modern, most-reliable generation of this badge — still a chain-tensioned engine, so not risk-free, but the furthest removed from the rear-chain story that defines this badge's reputation.

Generation	Years	Engine Code	Reliability	Recon Cost (Guide)	Era Note
E46	1998–2005	M47(M47D20 → M47TU → M47TU2)		£2,800–£4,500[PLACEHOLDER]	Widely regarded as one of BMW's most durable diesels — no rear-chain risk. Swirl flaps (150bhp variant, 2001+) are the one real weak point.
E90	2005–2011	N47D20A → N47D20C	1,450 JLR-wide[BMW-VERIFIED]	£3,200–£5,500[BMW-QUOTE]	The defining rear-mounted timing-chain generation. See the full E90 Generation Page for the M57/N57 diesel-six story alongside this engine.
F30	2011–2019	N47D20C(2011–2015/16)→ B47D20(2015/16–2019)	pre-faceliftpost-facelift	£3,000–£5,200 (N47)£3,400–£5,800 (B47)[PLACEHOLDER]	BMW's 2011 chain revision improved on the E90 N47 but didn't eliminate the rear-chain risk. The 2015/16 facelift replaced it entirely with the B47 — chain relocated to the front, a genuinely different risk profile.
G20	2019–present	B47D20(further revised)		£3,600–£6,000[PLACEHOLDER]	The modern, most-reliable generation of this badge — still a chain-tensioned engine, so not risk-free, but the furthest removed from the rear-chain story that defines this badge's reputation.

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UKCost Data
VerifiedReliability
ExpertInsights
Updated for2025

BMW 320d Engine Replacement Costs

Supply Only£3,400 – £5,800
Fitted (Indie)£4,500 – £7,100
Warranty12–24 months
Best ForMost owners — best cost/warranty balance

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£1,800 – £3,000	£2,650 – £4,000	1–6 months	Budget priority; vehicle under £4,000
Reconditioned Engine	£3,400 – £5,800	£4,500 – £7,100	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£4,800 – £7,000	£5,900 – £8,300	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£7,500 – £11,000	£9,000 – £13,000	24–36 months	Insurance jobs, warranty claims

Figures above reflect the current G20/late-F30 B47D20 generation, the most common quote request today. Older generations: see the Era Map above for E46/M47 and E90/N47-specific pricing, which runs lower.

Labour estimate: Fitting a 320d engine typically takes 10–14 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

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Common Problems With BMW 320d Engines

1. N47 Rear Timing Chain Failure(E90, early F30)

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–£5,500 (catastrophic).
Urgency: Immediate — if you hear rattle, book an inspection today.

Our recommendation:

This is the single most searched 320d issue for good reason — 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 /failures/n47-timing-chain/

1. N47 Rear Timing Chain Failure(E90, early F30)

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–£5,500 (catastrophic).
Urgency: Immediate — if you hear rattle, book an inspection today.

Our recommendation:

Read the full timing chain failure guide /failures/n47-timing-chain/

2. Swirl Flap Failure(M47 150bhp variant, E46/early E90)

Symptoms: Loss of power, rough idle, engine warning light, occasional rattling from the intake.
Typical Mileage: 100,000–180,000 miles.
Repair Cost: £100–£250 (preventative blanking plates).
Replacement Cost: £850–£1,200 (intake manifold, or engine repair if debris entered a cylinder).
Urgency: Monitor — book inspection soon.

Our recommendation:

This affects the M47's 150bhp common-rail variant and remains a known issue on early N47s too. Preventive blanking is cheap, effective, and removes the risk entirely with no noticeable performance loss.

Read the full swirl flap failure guide /failures/m57-swirl-flap

3. EGR Cooler Coolant Leak(N47 and B47, all F30-era)

Symptoms: Coolant loss with no visible external leak, white exhaust smoke, occasional burning smell.
Typical Mileage: Any mileage — this was the subject of a global BMW recall affecting both N47 and B47 diesel variants.
Repair Cost: £300–£600 (EGR cooler replacement).
Replacement Cost: N/A — this doesn't typically progress to engine replacement if addressed, but ignored coolant loss can lead to overheating damage.
Urgency: Immediate — check recall completion status on any F30-era 320d.

Our recommendation:

Verify recall completion before buying any N47 or B47-engined F30 320d — this is a straightforward, well-documented fix when caught early.

Read the full EGR cooler failure guide /failures/egr-valve-cooler

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320d — Repair, Buy, or Replace?

Not every issue means a new engine.Here’s what can be repaired, when it makes sense, and what to check before you buy.

Can It Be Repaired?

Problem	Repairable?	Typical Cost	When It Makes Sense
Cold-start timing chain rattle (N47)	Yes	£650 – £1,800	Preventative — catches the fault before it becomes catastrophic
Swirl flap fault (M47/early N47)	Yes	£100 – £250	Blanking plates remove the risk entirely
EGR cooler coolant leak (N47/B47)	Yes	£300 – £600	Straightforward fix if caught before overheating
Snapped timing chain	Usually No	Engine replacement	Piston-valve contact means little is left to repair
M47 injection pump failure (pre-2001)	Sometimes	£400 – £900 or replacement	Viable on lower-mileage examples; a lottery above 250,000km

ProblemRepairable? · Typical Cost

Cold-start timing chain rattle (N47)

Yes£650 – £1,800

Preventative — catches the fault before it becomes catastrophic

Swirl flap fault (M47/early N47)

Yes£100 – £250

Blanking plates remove the risk entirely

EGR cooler coolant leak (N47/B47)

Yes£300 – £600

Straightforward fix if caught before overheating

Snapped timing chain

Usually NoEngine replacement

Piston-valve contact means little is left to repair

M47 injection pump failure (pre-2001)

Sometimes£400 – £900 or replacement

Viable on lower-mileage examples; a lottery above 250,000km

Buying This 320d? Check These First

Buy if:

Documented timing-chain history if buying an E90 or pre-2016 F30
Confirmed EGR recall completion on any F30-era car
Full service history with sub-15,000km oil intervals
A post-2016 B47 if you want the cleanest slate of any 320d generation

Avoid if:

E90 or pre-2016 F30 with cold-start rattle and no chain history
No proof of swirl flap blanking or replacement on an M47 150bhp or early N47
Poor service history on any generation — this badge is unforgiving of neglect
Engine warning light with no diagnosis, regardless of generation

Closing verdict

Across four decades of this badge, the honest advice barely changes: buy on documented history, not on generation alone. The M47 and post-2016 B47 are this badge's two genuinely low-risk eras; the E90 and early F30 N47 demand real chain-history proof before you commit.

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Buying Checklist

Before you buy a used BMW 320d (or before you commit to an engine replacement), check these:

1. Cold Start
Listen for 1–30 seconds of rattle (timing chain warning, N47/early F30)
2. Service History
Including which engine era (M47/N47/B47) and confirmed oil-interval discipline
3. Smoke Check
White smoke on startup can indicate EGR coolant leak
4. Turbo Boost
Test acceleration; any lag, whistling, or grinding?
5. DPF Regeneration
Check history; short journeys accelerate wear on all diesel eras
6. Oil Consumption
Does it use more than 1L per 1,000 miles?
7. Engine Warning Light
Have codes been read? Any unresolved issues?
8. MOT History
Check for emissions-related failures

Why this matters

A 10-minute check now can save you thousands later. The right 320d is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW 320d (or before you commit to an engine replacement), check these:

1
Cold Start
Listen for 1–30 seconds of rattle (timing chain warning, N47/early F30)
2
Service History
Including which engine era (M47/N47/B47) and confirmed oil-interval discipline
3
Smoke Check
White smoke on startup can indicate EGR coolant leak
4
Turbo Boost
Test acceleration; any lag, whistling, or grinding?
5
DPF Regeneration
Check history; short journeys accelerate wear on all diesel eras
6
Oil Consumption
Does it use more than 1L per 1,000 miles?
7
Engine Warning Light
Have codes been read? Any unresolved issues?
8
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.

Engine Codes

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

M47D20 / M47TU / M47TU2

Years: 1998–2005
Power: 136–150 bhp
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £2,800–£4,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
M47D20 / M47TU / M47TU2	1998–2005	136–150 bhp	—(pattern data)	£2,800–£4,500[PLACEHOLDER]
N47D20A	2005–2010	163 bhp	—(within 1,450 JLR-wide N47 figure)	£3,200–£5,500[BMW-QUOTE]
N47D20C	2007–2015/16	174–184 bhp	1,450 JLR-wide[BMW-VERIFIED]	£3,200–£5,500[BMW-QUOTE]
B47D20	2015/16–present	190–224 bhp	—(pattern data)	£3,400–£5,800[PLACEHOLDER]

Technical Specscurrent B47D20 generation

Displacement: 1,995cc
Cylinders: 4-cylinder inline
Compression Ratio: 16.5:1
Fuel System: Common-rail direct injection
Turbocharger: Single-turbo (VGT), twin-turbo on higher-output variants

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Market Intelligence

Real data from thousands of 320d enquiries in 2025.

Most Common FailureN47 rear timing chain

65%

of pre-2016 320d enquiries

[PATTERN DATA]

Average Enquiry Mileage

97,000

miles

[PATTERN DATA]

Average Replacement Cost

£4,300

reconditioned, supply only

[BMW-QUOTE]

Most Requested Engine Code

N47D20C

[BMW-VERIFIED]

Peak Enquiry Season

Winter

Cold starts expose chain and swirl-flap issues

[PATTERN DATA]

Regional Demand

London: 22%
South East: 18%
North West: 12%
Other Regions: 48%

[PATTERN DATA]

Regional Demand Breakdown

22%London18%South East12%North West48%Other Regions

Frequently Asked Questions

A reconditioned 320d engine typically costs £2,800–£5,800 supply only depending on generation, with the current B47D20 sitting at £3,400–£5,800. Fitting adds £650–£1,300. Use our calculator for a figure specific to your car.

It depends entirely on which of the four engine generations your 320d has — this badge spans the M47 (1998–2005, excellent reliability, no chain risk), the N47 (2005–2015/16, the well-documented rear-chain risk generation), and the B47 (2015/16–present, chain relocated to the front, meaningfully improved). Check the Era Map above for your specific car.

Timing chain wear on N47-engined cars, swirl flap failure on the M47 150bhp variant and early N47s, and an EGR cooler coolant leak affecting both N47 and B47 F30-era cars (subject to a BMW recall).

Depends on vehicle value. Against a well-kept £7,000 320d, a £4,500 recon is 64% of the car's value — worth it. Against a tired £3,500 example, the same recon exceeds our 70% BMW threshold — get a scrap valuation first.

Listed on the VIN plate and vehicle documentation. As a rule of thumb: pre-2005 is M47, 2005–2015/16 is N47, 2015/16-onward is B47. Tell us your registration date and we'll confirm it for free.

Yes — if caught early. A preventative chain replacement (£650–£1,800) is far cheaper than a catastrophic chain snap (£3,200–£5,500 engine replacement). At the first sign of cold-start rattle, book an inspection immediately.

Disclaimer: 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.

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BMW 320d Engine Replacement —Compare Prices &Get Quotes

The 320d Through Time — Era Map

BMW 320d Engine Replacement Costs

Common Problems With BMW 320d Engines

1. N47 Rear Timing Chain Failure(E90, early F30)

2. Swirl Flap Failure(M47 150bhp variant, E46/early E90)

3. EGR Cooler Coolant Leak(N47 and B47, all F30-era)

1. N47 Rear Timing Chain Failure(E90, early F30)

2. Swirl Flap Failure(M47 150bhp variant, E46/early E90)

3. EGR Cooler Coolant Leak(N47 and B47, all F30-era)

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320d — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This 320d? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 320d Owners Trust BMWEngines.uk

Trusted 320d Engine Suppliers

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UK Engine Replacement Services for 320d

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