How much does a BMW 640i engine replacement cost in the UK?

A reconditioned 640i engine costs £4,500–£8,000 supply only depending on generation. F06/F12/F13 N55 engines start around £4,500; G32 B58 units start around £4,800. Fitting adds £1,200–£1,800. Use our calculator for a figure specific to your car.

Is the BMW 640i engine reliable?

It depends on which generation you have. The N55 (F06/F12/F13) is a proven engine - reliable but with known weak points (HPFP, chargepipe, oil filter housing). The B58 (G32) is more modern and generally more robust, with improved cooling and forged internals, though PCV valve issues and oil filter housing leaks are noted. Neither is a disaster; both demand good maintenance.

What are the common problems with the BMW 640i?

F06/F12/F13 N55: HPFP failure, chargepipe failure (plastic cracks), oil filter housing leaks, water pump failure. G32 B58: PCV valve diaphragm failure, oil filter housing leaks, turbocharger wastegate rattle, coolant loss. The specific issues depend entirely on which generation you have.

Is it worth replacing a BMW 640i engine, or should I scrap the car?

Depends on vehicle value and which generation. Against a well-kept £18,000 640i, a £6,000 recon is 33% - worth it. Against a tired £8,000 example, the same recon approaches our 70% BMW threshold - get a scrap valuation first.

How do I find my BMW 640i engine code?

Listed on the VIN plate and vehicle documentation. F06/F12/F13 (2011–2018): N55B30A. G32 (2017–2019): B58B30. The chassis code is the easiest tell - F06 is the Gran Coupe, F12 is the Convertible, F13 is the Coupe; G32 is the Gran Turismo.

Can I repair the HPFP on the N55, or does it need full engine replacement?

Yes - HPFP replacement is a well-understood repair costing £600–£1,200. It's the N55's most common weak point. If you experience long cranking or hesitation, don't ignore it - but it's a straightforward fix, not an engine killer. For the B58, similar principles apply - PCV repair is affordable and well-documented.

BMW 640i2011–20193.0L Straight-Six Turbo (N55 / B58)

BMW 640i Engine Replacement — Compare Prices & Get Quotes

Name: BMW 640i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW 6 Series specialists. Compare reconditioned, rebuilt and used N55 and B58 3.0-litre turbo engines - supply & fit available nationwide.

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BMW 640i Engines - from £3,500 to £10,500Common codes: N55B30A, B58B30

BMW 640i Engines - from £3,500 to £10,500· Common codes: N55B30A, B58B30

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The 640i THROUGH TIME - Era Map

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

Era Note

The original 640i - a proven N55. HPFP, chargepipe, and oil filter housing are the known weak points.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

F06/F12/F13 (Coupe/Convertible/Gran Coupe) BMW 320d F06/F12/F13 (Coupe/Convertible/Gran Coupe)

2011–2018N55B30A (3.0L Straight-Six Turbo)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£4,500–£7,000 [PLACEHOLDER - confirm vs cost sheet]The original 640i - a proven N55. HPFP, chargepipe, and oil filter housing are the known weak points.

G32 (Gran Turismo) BMW 320d G32 (Gran Turismo)

2017–2019B58B30 (3.0L Straight-Six Turbo)★★★★☆ [NEWLY ASSIGNED - see Data Note]£4,800–£8,000 [PLACEHOLDER]The later B58 - more robust, with improved cooling and forged internals. PCV and oil filter housing are the main concerns.

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 640i Engine Replacement Costs

Supply Only£4,500–£8,000

Fitted (Indie)£5,800–£9,500

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£3,500–£5,500£4,700–£7,0001–6 monthsBudget priority; lower-mileage examples

Reconditioned Engine£4,500–£8,000£5,800–£9,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£6,000–£9,500£7,300–£11,00012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£9,000–£14,000+£10,500–£16,000+24–36 monthsInsurance jobs, warranty claims

Figures above reflect the B58 and N55 3.0-litre turbo petrol engines. Used engines are available from approximately £3,500–£5,500, with reconditioned units ranging from £4,500–£8,000. N55 engines (F06/F12/F13) typically sit in the lower end of the range; B58 engines (G32) are generally more expensive.

Labour estimate: Fitting a 640i engine typically takes 12–16 hours at £70–£100/hr (independent) or £120–£180/hr (London/SE dealer).

→ Compare 640i engine prices from UK specialists

Common Problems With BMW 320d Engines

1. High-Pressure Fuel Pump (HPFP) Failure - N55 (F06/F12/F13)

Symptoms: Long cranking on startup, hesitation under acceleration, engine stalling, engine warning light, reduced power.

Typical mileage: 40,000–80,000 miles.

Repair cost: £600–£1,200 (HPFP replacement)【PLACEHOLDER - confirm vs cost sheet】

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

The N55's HPFP is its most notorious weak point. If you experience long cranking or hesitation, don't ignore it - a failing HPFP can lead to lean running and catalytic converter damage. The replacement is well-understood and well-documented. This applies exclusively to the F06/F12/F13 640i with the N55 engine.

Read the full HPFP failure guide

1. High-Pressure Fuel Pump (HPFP) Failure - N55 (F06/F12/F13)

Symptoms: Long cranking on startup, hesitation under acceleration, engine stalling, engine warning light, reduced power.

Typical mileage: 40,000–80,000 miles.

Repair cost: £600–£1,200 (HPFP replacement)【PLACEHOLDER - confirm vs cost sheet】

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

Read the full HPFP failure guide

2. Chargepipe Failure - N55 (F06/F12/F13)

Symptoms: Loss of boost, whistling noise from the engine bay, engine warning light, reduced power.

Typical mileage: 50,000–100,000 miles.

Repair cost: £300–£600 (chargepipe replacement with aftermarket metal unit)

Replacement cost: N/A - repair only

🟡 Monitor - book inspection soon

Our recommendation:

The N55's plastic chargepipe is prone to cracking, especially with age and heat cycles. The factory plastic pipes are a common failure point. The solution is an aftermarket metal chargepipe - fit once and forget. This is exclusively an F06/F12/F13 issue; the G32 B58 uses a revised design.

Read the full chargepipe failure guide

3. PCV Valve Failure - B58 (G32)

Symptoms: Rough idle, whistling noise from the engine, white or blue smoke from exhaust on startup, oil in the intake/chargepipe, misfires.

Typical mileage: 40,000–80,000 miles

Repair cost: £200–£500 (PCV diaphragm repair kit)【PLACEHOLDER - confirm vs cost sheet】

Replacement cost: N/A - repair only

🟡 Monitor - book inspection soon

Our recommendation:

The PCV diaphragm on first-generation B58 engines can tear, causing high crankcase vacuum and smoking. Signs include misfires, a rough idle, and oil in the intake/chargepipe. The good news is this is easily fixed with an affordable repair kit. If you notice rough idle, whistling, or smoke on startup, have the PCV system inspected. This applies to the G32 640i with the B58 engine.

Read the full PCV failure guide

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640i - 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.

640i - 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 SenseHPFP failure (N55)✅ Yes£600–£1,200Well-understood fix; cheaper than engine replacementChargepipe failure (N55)✅ Yes£300–£600Aftermarket metal unit solves permanentlyPCV diaphragm failure (B58)✅ Yes£200–£500Affordable repair kit; far cheaper than valve cover replacementOil filter housing leak (N55/B58)✅ Yes£500–£1,200Well-understood fix; aftermarket metal housing availableWater pump failure (N55/B58)✅ Yes£400–£900Straightforward fix; upgraded parts available

Buying This 640i? Check These First

Buy If

F06/F12/F13: Documented HPFP and chargepipe history (aftermarket metal chargepipe preferred)
F06/F12/F13: Full service history with BMW LL-01 approved oil
G32: Full service history and no evidence of PCV or cooling system issues
Any generation: No cold-start rattle, misfires, or hesitation

Avoid If

F06/F12/F13: No proof of HPFP or chargepipe maintenance - these are whens, not ifs
F06/F12/F13: Poor service history - the N55 is unforgiving of neglect
G32: Rough idle, whistling, or smoke (PCV diaphragm warning)
Any generation: Engine warning light with no diagnosis

Closing Verdict

The 640i badge spans two of BMW's finest modern straight-sixes - the proven N55 and the improved B58. The N55 is a legend with known weak points; the B58 is more robust but still has its own patterns. Both are rewarding engines when properly maintained. Buy the generation that matches your priorities - but buy on documented history either way. A well-maintained 640i is a £15,000–£30,000 grand tourer; a neglected one is a £7,000 engine replacement waiting to happen.

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

→ Compare 640i 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 640i engine prices before you buy

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Buying Checklist

Before you buy a used BMW 640i (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattling or hesitation (N55: HPFP warning; B58: PCV warning)

Service History

including which engine era (N55 for F06/F12/F13, B58 for G32) and confirmed oil-interval discipline

Chargepipe Check (N55)

Has the plastic chargepipe been replaced with an aftermarket metal unit?

HPFP Check (N55)

Any history of long cranking, hesitation, or HPFP replacement?

Smoke Check

White or blue smoke on startup can indicate PCV or turbo issues

Oil Leak Check

Any history of oil leaks? (oil filter housing is a known weak point on both)

Engine Warning Light

Have codes been read? Any unresolved HPFP, chargepipe, PCV, or cooling system 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.

N55B30A (3.0L Straight-Six Turbo)

Years2011–2018

Power320 PS (235 kW) @ 5,800 rpm · 450 Nm @ 1,300–4,500 rpm

2025 Enquiries- (pattern data)

Avg. Recon Cost£4,500–£7,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N55B30A (3.0L Straight-Six Turbo)2011–2018320 PS (235 kW) @ 5,800 rpm · 450 Nm @ 1,300–4,500 rpm- (pattern data)£4,500–£7,000 [PLACEHOLDER]

B58B30 (3.0L Straight-Six Turbo)2017–2019340 PS (250 kW) · 450 Nm- (pattern data)£4,800–£8,000 [PLACEHOLDER]

Technical Specs

N55B30A (F06/F12/F13)Displacement: 2,979cc · Cylinders: Straight-6 · Compression: 10.2:1 · Fuel: Direct injection · Turbo: Single twin-scroll

B58B30 (G32)Displacement: 2,998cc · Cylinders: Straight-6 · Compression: 11.0:1 · Fuel: Direct injection · Turbo: Single twin-scroll with air-to-liquid intercooler

→ Compare 640i engine prices for your BMW

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Market Intelligence

Most Common Failure (N55)

HPFP failure

the N55's most notorious weak point; chargepipe failure also common

Most Common Failure (B58)

PCV valve failure

a known issue on first-generation B58 engines

Average Enquiry Mileage

55,000

–85,000 miles

[PATTERN DATA]

Average Replacement Cost

£4,500

–£8,000 reconditioned, supply only

[PLACEHOLDER - confirm vs cost sheet]

Most Requested Engine Code

N55B30A / B58B30

[PATTERN DATA]

Peak Enquiry Season

Winter

cold starts expose HPFP and PCV issues【PATTERN DATA】

Regional Demand

London20%

South East18%

North West12%

PATTERN DATA

Regional Demand Breakdown

20%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 640i Owners Trust BMWEngines.uk

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see prices, warranty terms and supply & fit options side-by-side before you commit, across every 6 Series that left the factory with the 3.0-litre straight-six.
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supply-only or full supply & fit available nationwide, covering every 640i generation - and we're vetted across both the N55 and B58 engine families.

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12-Month Warranty

As standard

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