How much does a BMW 330d engine replacement cost in the UK?

A reconditioned 330d engine typically costs £3,500–£9,500 supply only depending on generation, with the current B57D30 sitting at £5,000–£9,500. Fitting adds £1,000–£1,800. Use our calculator for a figure specific to your car.

Is the BMW 330d engine reliable?

It depends entirely on which generation you're asking about. The M57 (E46, early E90) is one of BMW's most durable diesels - a cast-iron block that regularly exceeds 200,000 miles. The N57 (late E90, F30) is more complex - timing chain and bottom-end bearing issues are well-documented. The B57 (G20) is BMW's modern diesel, significantly improved and more reliable. Across all, oil-change discipline is everything.

What are the common problems with the BMW 330d?

N57 timing chain wear (rear-mounted chain is the defining weak point), EGR cooler failure (recall item on N57 and B57), swirl flap failure (M57 pre-2003), bottom-end bearing wear (N57), and DPF clogging (all generations). See the Era Map above for generation-specific advice.

Is it worth replacing a BMW 330d engine, or should I scrap the car?

Depends on vehicle value. Against a well-kept £8,000–£10,000 E90 or F30 330d, a £4,500–£5,500 recon is 45–60% of the car's value - borderline but often worth it for a good example. Against a £15,000+ G20, a £6,000 recon is 40% - worth it. The BMW scrap threshold of 70% means evaluating the whole vehicle and its condition before committing.

How do I find my BMW 330d engine code?

Listed on the VIN plate and vehicle documentation. As a rule of thumb: E46 (1999–2005) = M57D30; E90 pre-LCI (2005–2008) = M57TU2; E90 LCI (2008–2011) = N57D30; F30 (2011–2019) = N57D30; G20 (2019–present) = B57D30. Tell us your registration date and we'll confirm it for free.

Can I repair the N57 timing chain, or does it need replacement?

Yes - if caught early. A preventative chain, tensioner and guide replacement costs £1,500–£3,500. However, the N57 chain is rear-mounted, making it an engine-out or gearbox-off job. If the chain snaps, a full engine replacement (£4,500–£8,000) is usually required. At the first sign of rear-engine rattle, book an inspection immediately.

BMW 3 Series 330d1999–presentM57 / N57 / B57 3.0 Straight-Six Diesel

BMW 3 Series 330d Engine Replacement — Compare Prices & Get Quotes

Name: BMW 3 Series 330d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

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BMW 330d Engines - from £1,800 to £9,500Common codes: M57D30, N57D30, B57D30

BMW 330d Engines - from £1,800 to £9,500· Common codes: M57D30, N57D30, B57D30

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The 330d THROUGH TIME - Era Map

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

Era Note

Cast-iron block legend - one of BMW's most durable diesels; swirl flaps (pre-2003) are the main weak point

GenerationYearsEngine CodeReliabilityRecon CostEra Note

3 Series E46 BMW 320d 3 Series E46

1999–2005M57D30 (184–204 bhp)★★★★½ [NEWLY ASSIGNED - see Data Note]£3,500–£6,500 [PLACEHOLDER - confirm vs cost sheet]Cast-iron block legend - one of BMW's most durable diesels; swirl flaps (pre-2003) are the main weak point

3 Series E90/E91/E92/E93 BMW 320d 3 Series E90/E91/E92/E93

2005–2008M57TU2 (231 bhp)★★★★☆ [NEWLY ASSIGNED - see Data Note]£4,000–£7,000 [PLACEHOLDER - confirm vs cost sheet]Revised M57 - 231 bhp, 500 Nm; robust but EGR cooler and swirl flap issues need attention

3 Series E90/E91/E92/E93 LCI BMW 320d 3 Series E90/E91/E92/E93 LCI

2008–2011N57D30 (245 bhp)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£4,500–£7,500 [PLACEHOLDER - confirm vs cost sheet]First-gen aluminium-block N57 - timing chain at rear; more complex than M57, needs stricter maintenance

3 Series F30/F31/F34 BMW 320d 3 Series F30/F31/F34

2011–2019N57D30 (258 bhp, later 265 bhp)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£4,500–£8,000 [PLACEHOLDER - confirm vs cost sheet]Mature N57 - revised timing chain guides (2015+); ZF8 gearbox is the star; chain and bottom-end bearings need monitoring

3 Series G20/G21 BMW 320d 3 Series G20/G21

2019–presentB57D30 (265–286 bhp)★★★★☆ [NEWLY ASSIGNED - see Data Note]£5,000–£9,500 [PLACEHOLDER - confirm vs cost sheet]Modern B57 straight-six - significantly improved chain durability; valve cover and oil filter housing leaks are the main watchpoints

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 3 Series 330d Engine Replacement Costs

Supply Only£4,000–£7,500

Fitted (Indie)£5,200–£9,000

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£4,000–£7,500£5,200–£9,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£5,500–£9,500£6,800–£11,00012–24 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/B57 generation, the most common quote request today. Older generations: see the Era Map above for E46/M57, E90/N57 and F30/N57-specific pricing, which can vary significantly.

Labour estimate: Fitting a 330d engine typically takes 10–16 hours at £75–£110/hr (independent) or £130–£180/hr (London/SE dealer). N57 timing chain replacement is an engine-out or gearbox-off job, adding significant labour. [PLACEHOLDER - confirm vs cost sheet]

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Common Problems With BMW 320d Engines

1. N57 Timing Chain Tensioner & Guide Wear (E90 LCI, F30)

Symptoms: Rattling noise from the rear of the engine on cold start, metallic grinding at 2,000 rpm, engine warning light, loss of power.

Typical mileage: 80,000–150,000 miles

Repair cost: £1,500–£3,500 (timing chain, tensioner and guide replacement - engine-out or gearbox-off job)

Replacement cost: £4,500–£8,000 (if chain snaps and valves meet pistons)

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

Our recommendation:

The N57's rear-mounted timing chain is the defining weak point of this engine generation. Unlike the front-mounted M57 chain, N57 chain replacement is a labour-intensive job. From 2015 onwards, BMW revised the guides with filled-in ribs to reduce failure rates, but the risk remains. Regular oil changes (10,000 miles max, not BMW's CBS intervals) are the best prevention. At the first sign of rear-engine rattle, get it inspected immediately - a £1,500–£3,500 preventative chain replacement is dramatically cheaper than a £4,500+ engine swap.

1. N57 Timing Chain Tensioner & Guide Wear (E90 LCI, F30)

Symptoms: Rattling noise from the rear of the engine on cold start, metallic grinding at 2,000 rpm, engine warning light, loss of power.

Typical mileage: 80,000–150,000 miles

Repair cost: £1,500–£3,500 (timing chain, tensioner and guide replacement - engine-out or gearbox-off job)

Replacement cost: £4,500–£8,000 (if chain snaps and valves meet pistons)

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

Our recommendation:

2. Swirl Flap Failure (M57 - E46, Early E90)

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

Typical mileage: 80,000–150,000 miles

Repair cost: £100–£300 (preventative blanking plates)【PLACEHOLDER】

Replacement cost: £1,000–£2,500 (intake manifold replacement, or engine repair if debris entered a cylinder)【PLACEHOLDER】

🟡 Monitor - book inspection soon

Our recommendation:

The M57's swirl flaps in the intake manifold can fail, with the metal flap breaking off and being ingested into the engine - catastrophic if it happens. This affects pre-2003 M57 engines most severely, but post-2003 revisions reduced the risk. Preventative blanking plates (£100–£300) remove the risk entirely with no noticeable performance loss. If your E46 or early E90 330d hasn't had this done, consider it essential preventative maintenance.

3. EGR Cooler Failure (N57 & B57)

Symptoms: Coolant loss with no visible external leak, white exhaust smoke, occasional burning smell, engine warning light.

Typical mileage: Any mileage - subject to BMW recalls

Repair cost: £0 (if recall applies) - £400–£1,200 (if out of warranty)【PLACEHOLDER】

Replacement cost: N/A - repair only (unless coolant loss leads to overheating damage)

🔴 Immediate - check recall status immediately; can cause fire risk

Our recommendation:

EGR cooler failure is a well-documented issue across N57 and B57 engines. BMW issued multiple recalls for this - the latest with an updated part number. A leaking EGR cooler can allow coolant into the exhaust system, and in some cases, can create a fire risk. Check your vehicle's recall status immediately - if your 330d hasn't had the updated EGR cooler fitted, get it done. This is a safety-critical item.

4. N57 Bottom-End Bearing Failure

Symptoms: Knocking noise from the bottom of the engine, especially under load, low oil pressure warning, eventual engine seizure.

Typical mileage: 80,000–120,000 miles

Repair cost: £3,000–£6,000 (bottom-end rebuild or replacement)

Replacement cost: £4,500–£8,000 (if catastrophic failure occurs)

🔴 Immediate - if you hear knocking, stop driving immediately

Our recommendation:

N57 engines can suffer from bottom-end bearing failure, particularly on higher-mileage examples. The twin-turbo versions (335d) seem to suffer more than the single-turbo 330d, but it's still a known risk. Regular oil changes with the correct BMW-spec oil are the key prevention - many specialists recommend 8,000–10,000 mile intervals rather than BMW's CBS schedule. If you hear a knocking noise from the bottom end, stop driving immediately and have it inspected.

5. DPF & Emissions System Issues (All Generations)

Symptoms: DPF warning light, reduced power, increased fuel consumption, frequent regeneration cycles, MOT emissions failure.

Typical mileage: Any mileage - short-journey dependent

Repair cost: £200–£800 (DPF clean, forced regeneration, or sensor replacement)【PLACEHOLDER】

Replacement cost: £1,000–£2,500 (DPF replacement)【PLACEHOLDER】

🟠 Check - book inspection soon; can lead to costly emissions system damage

Our recommendation:

All modern diesels - M57, N57 and B57 - suffer from DPF issues if used primarily for short urban journeys. The DPF needs regular motorway runs to regenerate passively. If the car has been used mostly for short trips, the DPF can clog, leading to expensive repairs. Regular motorway driving and using premium diesel (e.g., Shell V-Power) can help keep the DPF healthy.

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BMW 330d - 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.

BMW 330d - 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 SenseN57 timing chain rattle (preventative)✅ Yes£1,500–£3,500Catch it early - far cheaper than engine replacementSwirl flap failure (M57)✅ Yes£100–£300Blanking plates are cheap and permanentEGR cooler failure✅ Yes£400–£1,200 (or recall)Recall work is free; out-of-warranty repair is still viableN57 bottom-end bearing wear⚠️ Sometimes£3,000–£6,000Viable if caught early; often requires full rebuildDPF clogging✅ Yes£200–£800Cleaning or forced regeneration is cost-effectiveSnapped timing chain (N57)❌ Usually NoEngine replacementPiston-valve contact means little is left to repair

Buying This 330d? Check These First

Buy If

Full service history with oil changes at 10,000-mile intervals (not CBS extended schedule)
EGR cooler recall completed (check with BMW)
N57 cars (2011–2019): no cold-start rattle from the rear of the engine
M57 cars (pre-2011): swirl flaps blanked or replaced
B57 cars (2019+): clean service history and no coolant loss

Avoid If

N57 with cold-start rattle - timing chain work is imminent and expensive
No proof of regular oil changes - these engines are unforgiving of neglect
EGR cooler not replaced - potential fire risk
Any knocking from the bottom end - bearing failure is likely
DPF warnings with no diagnosis - emissions system repairs can be costly

Closing Verdict

The BMW 330d represents one of the finest diesel engines ever made. The M57 is a cast-iron legend; the N57 offers more power but demands stricter maintenance; the B57 is BMW's modern masterpiece. Across all three generations, one rule applies: oil change discipline is everything. BMW's extended CBS servicing is widely considered inadequate - treat your 330d to 8,000–10,000 mile oil changes and it will reward you with hundreds of thousands of miles of effortless motoring. Buy on history, not on low mileage alone.

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Buying Checklist

Before you buy a used BMW 330d (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattle from the rear of the engine (N57 timing chain warning)

Service History

Including which engine era (M57/N57/B57) and confirmed oil-change discipline (10k miles max)

EGR Cooler

Check recall status; this is a safety-critical item on N57 and B57

Swirl Flaps

M57 cars: have they been blanked? (Pre-2003 cars are the highest risk)

DPF Health

Ask about regeneration frequency; urban cars will have more issues

Oil Consumption

Does it use more than 1L per 1,000 miles? (N57 oil consumption is a known issue)

Engine Warning Light

Have codes been read? Timing, EGR, DPF, or emissions codes are most common

MOT History

Check for emissions-related failures (EGR, DPF, NOx sensor issues)

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 exactly match Section 1B's Era Map - the same engine codes, years, and generation coverage.

M57D30 (E46)

Years1999–2005

Power184–204 bhp · 390–410 Nm

2025 Enquiries- (pattern data)

Avg. Recon Cost£3,500–£6,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M57D30 (E46)1999–2005184–204 bhp · 390–410 Nm- (pattern data)£3,500–£6,500 [PLACEHOLDER]

M57TU2 (E90 pre-LCI)2005–2008231 bhp · 500 Nm- (pattern data)£4,000–£7,000 [PLACEHOLDER]

N57D30 (E90 LCI)2008–2011245 bhp · 500 Nm- (pattern data)£4,500–£7,500 [PLACEHOLDER]

N57D30 (F30/F31/F34)2011–2019258–265 bhp · 560 Nm- (pattern data)£4,500–£8,000 [PLACEHOLDER]

B57D30 (G20/G21)2019–present265–286 bhp · 580–650 Nm- (pattern data)£5,000–£9,500 [PLACEHOLDER]

Technical Specs

Current B57D30 generation

Displacement2,993cc

Cylinders6-cylinder inline

Compression Ratio16.5:1

Fuel SystemCommon-rail direct injection (2,200–2,500 bar)

TurbochargerSingle variable-geometry turbocharger (VGT) - twin-turbo on higher-output variants

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Market Intelligence

Most Common Failure

N57 timing chain wear

35%

of 330d enquiries cite chain or timing concerns【PATTERN DATA】

Average Enquiry Mileage

85,000

–110,000 miles【PATTERN DATA】

Average Replacement Cost

£5,500

reconditioned, supply only【PLACEHOLDER】

Most Requested Engine Code

N57D30

F30-era 330d is the most common 330d on UK roads【PATTERN DATA】

Peak Enquiry Season

Winter

cold starts expose timing chain and glow plug issues【PATTERN DATA】

Regional Demand

South East22%

North West15%

Scotland (12%)【PATTERN DATA】

Regional Demand Breakdown

22%South East

15%North West

BMW 320d - Frequently Asked Questions

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