How much does a BMW 4 Series 430d engine replacement cost in the UK?

A reconditioned 430d engine typically costs £4,000–£9,500 supply only depending on generation, with the current B57D30 sitting at £4,500–£9,500. Fitting adds £1,000–£1,800. Use our calculator for a figure specific to your car.

Is the BMW 4 Series 430d engine reliable?

It depends on which generation you're asking about. The N57 (F32, 2013–2020) is more reliable than the problematic N47, but timing chain issues (though rarer) and bottom-end bearing failures have been reported. The B57 (G22, 2020+) is generally improved with mild-hybrid tech, but oil leaks and AdBlue/EGR system issues are reported. Across both, oil-change discipline is everything.

What are the common problems with the BMW 430d?

N57 timing chain wear and bottom-end bearing failure (F32), EGR cooler failure (both generations - recall item), B57 oil leaks from valve cover and oil filter housing (G22), and AdBlue/SCR system issues (G22). See the Era Map above for generation-specific advice.

Is it worth replacing a BMW 430d engine, or should I scrap the car?

Depends on vehicle value. Against a well-kept £10,000–£15,000 F32 430d, a £4,500–£5,500 recon is 30–50% of the car's value - often worth it for a good example. Against a £25,000+ G22, a £6,000 recon is 25% - worth it. The BMW scrap threshold of 70% means evaluating the whole vehicle and its condition before committing.

How do I find my BMW 430d engine code?

Listed on the VIN plate and vehicle documentation. As a rule of thumb: F32/F33/F36 (2013–2020) = N57D30; G22/G23/G26 (2020–present) = B57D30. Tell us your registration date and we'll confirm it for free.

Has the BMW 430d been recalled for the EGR cooler issue?

Yes - BMW has extended its diesel car recall multiple times due to concerns that a faulty EGR cooler part presents a fire risk. Glycol leakage from the EGR cooler can occur. Check your vehicle's recall status immediately - if your 430d hasn't had the updated EGR cooler fitted, get it done. This is a safety-critical item.

BMW 4 Series 430d2013–presentN57 / B57 3.0 Straight-Six Diesel

BMW 4 Series 430d Engine Replacement — Compare Prices & Get Quotes

Name: BMW 4 Series 430d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW 430d specialists. Compare reconditioned, rebuilt and used N57 and B57 3.0-litre straight-six diesel engines - supply & fit available nationwide for this premium performance coupé.

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BMW 4 Series 430d Engines - from £2,500 to £9,500Common codes: N57D30, B57D30

BMW 4 Series 430d Engines - from £2,500 to £9,500· Common codes: N57D30, B57D30

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The 4 SERIES 430d THROUGH TIME - Era Map

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

Era Note

N57 era - more reliable than N47 but chain and bottom-end bearing issues need monitoring; EGR cooler recall essential

GenerationYearsEngine CodeReliabilityRecon CostEra Note

4 Series F32/F33/F36 BMW 320d 4 Series F32/F33/F36

2013–2020N57D30 (3.0L I6 diesel, 258 bhp)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£4,000–£7,500 [PLACEHOLDER - confirm vs cost sheet]N57 era - more reliable than N47 but chain and bottom-end bearing issues need monitoring; EGR cooler recall essential

4 Series G22/G23/G26 BMW 320d 4 Series G22/G23/G26

2020–presentB57D30 (3.0L I6 diesel, 286 bhp + 48V MHEV)★★★★☆ [NEWLY ASSIGNED - see Data Note]£4,500–£9,500 [PLACEHOLDER - confirm vs cost sheet]Modern B57 with mild-hybrid - 286 bhp, 650 Nm; improved reliability but oil leaks and AdBlue/EGR issues need watching

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 4 Series 430d 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£2,500–£4,500£3,500–£5,8001–6 monthsBudget priority; vehicle under £8,000

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 G22/B57 generation, the most common quote request today. Older generations: see the Era Map above for F32/N57-specific pricing.

Labour estimate: Fitting a 430d engine typically takes 10–16 hours at £75–£110/hr (independent) or £130–£180/hr (London/SE dealer). N57 timing chain work is a significant job. [PLACEHOLDER - confirm vs cost sheet]

→ Compare 430d engine prices from UK specialists

Common Problems With BMW 320d Engines

1. N57 Timing Chain & Guide Wear (F32, all years)

Symptoms: Rattling noise from the engine on cold start, metallic clattering, engine warning light, loss of power, potential engine failure if chain skips or snaps.

Typical mileage: 80,000–150,000 miles

Repair cost: £1,500–£3,500 (timing chain, tensioner and guide replacement)

Replacement cost: £4,000–£7,500 (if chain snaps and valves meet pistons)

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

Our recommendation:

While N57 timing chain failures are rarer than the notorious N47 issues, they do occur. The problem stems from chain stretch and wear on the plastic guides. A cold-start rattle is the early warning sign - ignore it and you risk piston-valve contact and a full engine replacement. Regular oil changes with the correct BMW-approved oil are the best prevention - many specialists recommend 8,000-mile intervals rather than BMW's 18,000-mile CBS schedule. At the first sign of rattle, get it inspected immediately.

1. N57 Timing Chain & Guide Wear (F32, all years)

Symptoms: Rattling noise from the engine on cold start, metallic clattering, engine warning light, loss of power, potential engine failure if chain skips or snaps.

Typical mileage: 80,000–150,000 miles

Repair cost: £1,500–£3,500 (timing chain, tensioner and guide replacement)

Replacement cost: £4,000–£7,500 (if chain snaps and valves meet pistons)

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

Our recommendation:

2. N57 Bottom-End Bearing Failure (F32)

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

Typical mileage: 80,000–120,000 miles

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

Replacement cost: £4,000–£7,500 (if catastrophic failure occurs)

🔴 Immediate - if you hear knocking, stop driving immediately

Our recommendation:

N57 engines can suffer from bottom-end bearing failure, often linked to oil starvation or oil degradation. Extended oil change intervals are a contributing factor. If you hear a knocking noise from the bottom end, stop driving immediately and have it inspected. Regular oil changes with BMW-approved oil are the key prevention - many specialists recommend 8,000-mile intervals.

3. EGR Cooler Failure (N57 & B57 - Recall Item)

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

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 has extended its diesel car recall multiple times due to concerns that a faulty part presents a fire risk. Glycol leakage from the EGR cooler can occur, and in some cases, can create a fire risk. Check your vehicle's recall status immediately - if your 430d hasn't had the updated EGR cooler fitted, get it done. This is a safety-critical item.

4. B57 Oil Leaks (G22 - Valve Cover & Oil Filter Housing)

Symptoms: Oil spots under the vehicle, burning oil smell, low oil level warning, visible oil seepage around the valve cover or oil filter housing.

Typical mileage: 40,000–80,000 miles

Repair cost: £400–£1,000 (valve cover gasket or oil filter housing gasket replacement)【PLACEHOLDER】

Replacement cost: N/A - repair only

🟡 Monitor - book inspection soon; oil leaks can damage other components

Our recommendation:

The B57 engine has a well-documented tendency for oil leaks from the valve cover gasket and oil filter housing. The rubber seals harden due to heat and age, causing oil to leak. Leaking oil can saturate and degrade vacuum, coolant, and air intake hoses, and can foul other components. Regular inspections can catch this before it becomes a major issue. If you notice oil spots under your car or a burning oil smell, have it inspected promptly.

5. AdBlue / SCR System Issues (B57 - G22)

Symptoms: Engine warning light, AdBlue countdown timer starting, reduced power, emissions warning, MOT failure.

Typical mileage: 30,000–70,000 miles

Repair cost: £300–£1,200 (sensor replacement, AdBlue system service, or crystallisation removal)【PLACEHOLDER】

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently if AdBlue countdown appears

Our recommendation:

The B57's AdBlue (SCR) system is essential for meeting Euro 6d emissions standards. Like many modern diesels, AdBlue crystallisation in the injector or exhaust pipe, NOx sensor failures, and heater unit faults are reported. If the countdown timer starts, do not ignore it - once it reaches zero, the engine will not restart. Regular AdBlue system maintenance and using high-quality AdBlue reduces risk. This is a common issue on B57-powered BMWs.

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BMW 430d - 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 430d - 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 replacementN57 bottom-end bearing wear⚠️ Sometimes£3,000–£6,000Viable if caught early; often requires full rebuildEGR cooler failure✅ Yes£400–£1,200 (or recall)Recall work is free; out-of-warranty repair is still viableB57 oil leaks (valve cover / oil filter housing)✅ Yes£400–£1,000Affordable preventative maintenanceAdBlue/SCR system issues✅ Yes£300–£1,200Sensor and injector replacement is straightforwardSnapped timing chain (N57)❌ Usually NoEngine replacementPiston-valve contact means little is left to repair

Buying This 430d? Check These First

Buy If

Full service history with oil changes at 8,000–10,000 mile intervals (not BMW's 18,000-mile CBS schedule)
EGR cooler recall completed (check with BMW)
N57 cars (2013–2020): no cold-start rattle from the engine
N57 cars (2013–2020): no knocking from the bottom end
B57 cars (2020+): no oil leaks and AdBlue system functioning correctly

Avoid If

No proof of regular oil changes - these engines are unforgiving of neglect
N57 with cold-start rattle - timing chain work is imminent and expensive
N57 with knocking from the bottom end - bearing failure is likely
EGR cooler not replaced - potential fire risk
Any engine warning light without diagnosis - the N57 and B57 can hide expensive faults

Closing Verdict

The BMW 430d is a genuinely special car - a sleek, stylish coupé with a silky-smooth straight-six diesel that delivers effortless performance and remarkable fuel economy. The N57-powered F32 generation offers proven performance but demands timing chain and bottom-end vigilance, along with EGR cooler recall completion. The B57-powered G22 generation is a significant step forward in refinement and reliability, with the added benefit of mild-hybrid efficiency. Across both generations, one rule applies: oil change discipline is everything. BMW's extended CBS servicing is widely considered inadequate - treat your 430d to 8,000–10,000 mile oil changes and it will reward you with hundreds of thousands of miles of effortless motoring.

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Buying Checklist

Before you buy a used BMW 430d (or before you commit to an engine replacement), check these:

Cold Start

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

Service History

Including which engine era (N57/B57) and confirmed oil-change discipline (8k–10k miles max)

EGR Cooler

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

Oil Leaks

Check for oil around the valve cover and oil filter housing (B57)

Bottom End

Any knocking from the bottom of the engine? (N57 bearing warning)

AdBlue System

Any warnings or countdowns? (B57)

Engine Warning Light

Have codes been read? Timing, EGR, oil, or AdBlue 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.

N57D30 (F32/F33/F36)

Years2013–2020

Power258 bhp (190 kW) @ 4,000 rpm · 560 Nm @ 1,500–3,000 rpm

2025 Enquiries- (pattern data)【PATTERN DATA】

Avg. Recon Cost£4,000–£7,500【PLACEHOLDER - confirm vs cost sheet】

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N57D30 (F32/F33/F36)2013–2020258 bhp (190 kW) @ 4,000 rpm · 560 Nm @ 1,500–3,000 rpm- (pattern data)【PATTERN DATA】£4,000–£7,500【PLACEHOLDER - confirm vs cost sheet】

B57D30 (G22/G23/G26)2020–present286 bhp (210 kW) @ 4,000 rpm · 650 Nm @ 1,500–2,500 rpm- (pattern data)【PATTERN DATA】£4,500–£9,500【PLACEHOLDER - confirm vs cost sheet】

Technical Specs

Current B57D30 generation

Displacement2,993cc

Cylinders6-cylinder inline, 24 valves

Compression Ratio16.5:1

Fuel SystemCommon-rail direct injection

TurbochargerSingle variable-geometry turbocharger (VGT)

Mild Hybrid48V system (B57 G22 generation)

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Market Intelligence

Most Common Failure

N57 timing chain wear and EGR cooler failure

35%

of 430d enquiries cite chain, EGR, or oil concerns【PATTERN DATA】

Average Enquiry Mileage

60,000

–90,000 miles【PATTERN DATA】

Average Replacement Cost

£5,500

reconditioned, supply only【PLACEHOLDER】

Most Requested Engine Code

N57D30

F32-era 430d is the most common 430d on UK roads【PATTERN DATA】

Peak Enquiry Season

Winter

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

Regional Demand

South East22%

London18%

North West (13%)【PATTERN DATA】

Regional Demand Breakdown

22%South East

18%London

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.

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