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.

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.

Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

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

Instant Quotes
No Obligation
100% Free
Reconditioned
Rebuilt
Used
Supply & Fit Available
UK-Wide Network

Instant Quotes
No Obligation
100% Free
Reconditioned
Rebuilt
Used
Supply & Fit Available
UK-Wide Network

The 640i Through Time — Era Map

Two generations. Two 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.

Era Note

The later B58 — more robust, with improved cooling and forged internals. PCV and oil filter housing are the main concerns.

Generation	Years	Engine Code	Reliability	Recon Cost (Guide)	Era Note
F06/F12/F13 (Coupe/Convertible/Gran Coupe)	2011–2018	N55B30A(3.0L Straight-Six Turbo)		£4,500–£7,000[PLACEHOLDER]	The original 640i — a proven N55. HPFP, chargepipe, and oil filter housing are the known weak points.
G32 (Gran Turismo)	2017–2019	B58B30(3.0L Straight-Six Turbo)		£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?

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 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 Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£3,500 – £5,500	£4,700 – £7,000	1–6 months	Budget priority; lower-mileage examples
Reconditioned Engine	£4,500 – £8,000	£5,800 – £9,500	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£6,000 – £9,500	£7,300 – £11,000	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£9,000 – £14,000+	£10,500 – £16,000+	24–36 months	Insurance 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 640i 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
Urgency: 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 /failures/n54-high-pressure-fuel-pump

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
Urgency: Check — book inspection urgently

Our recommendation:

Read the full HPFP failure guide /failures/n54-high-pressure-fuel-pump

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
Urgency: 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 /failures

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
Urgency: 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 /failures

Ready to Compare?

Get Matched With a Vetted BMW Specialist

20+ vetted BMW specialists, every 640i era covered — N55 and B58 — with a 12-month warranty as standard.

Get My Free 640i Engine Quotes Now

640i — 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
HPFP failure (N55)	Yes	£600 – £1,200	Well-understood fix; cheaper than engine replacement
Chargepipe failure (N55)	Yes	£300 – £600	Aftermarket metal unit solves permanently
PCV diaphragm failure (B58)	Yes	£200 – £500	Affordable repair kit; far cheaper than valve cover replacement
Oil filter housing leak (N55/B58)	Yes	£500 – £1,200	Well-understood fix; aftermarket metal housing available
Water pump failure (N55/B58)	Yes	£400 – £900	Straightforward fix; upgraded parts available

ProblemRepairable? · Typical Cost

HPFP failure (N55)

Yes£600 – £1,200

Well-understood fix; cheaper than engine replacement

Chargepipe failure (N55)

Yes£300 – £600

Aftermarket metal unit solves permanently

PCV diaphragm failure (B58)

Yes£200 – £500

Affordable repair kit; far cheaper than valve cover replacement

Oil filter housing leak (N55/B58)

Yes£500 – £1,200

Well-understood fix; aftermarket metal housing available

Water pump failure (N55/B58)

Yes£400 – £900

Straightforward 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. Compare.

Get real quotes from vetted UK specialists and make the right call for your 640i.

Compare 640i engine prices before you buy

20+ Vetted SpecialistsUK Network
12-Month Warrantyas Standard
Nationwide Delivery& Collection
Transparent PricingNo Hidden Fees
Thousands of 640iOwners Helped

Buying Checklist

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

1. Cold Start
Listen for rattling or hesitation (N55: HPFP warning; B58: PCV warning)
2. Service History
Including which engine era (N55 for F06/F12/F13, B58 for G32) and confirmed oil-interval discipline
3. Chargepipe Check (N55)
Has the plastic chargepipe been replaced with an aftermarket metal unit?
4. HPFP Check (N55)
Any history of long cranking, hesitation, or HPFP replacement?
5. Smoke Check
White or blue smoke on startup can indicate PCV or turbo issues
6. Oil Leak Check
Any history of oil leaks? (oil filter housing is a known weak point on both)
7. Engine Warning Light
Have codes been read? Any unresolved HPFP, chargepipe, PCV, or cooling system issues?
8. MOT History
Check for emissions-related failures

Why this matters

A 10-minute check now can save you thousands later. The right 640i is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

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

1
Cold Start
Listen for rattling or hesitation (N55: HPFP warning; B58: PCV warning)
2
Service History
Including which engine era (N55 for F06/F12/F13, B58 for G32) and confirmed oil-interval discipline
3
Chargepipe Check (N55)
Has the plastic chargepipe been replaced with an aftermarket metal unit?
4
HPFP Check (N55)
Any history of long cranking, hesitation, or HPFP replacement?
5
Smoke Check
White or blue smoke on startup can indicate PCV or turbo issues
6
Oil Leak Check
Any history of oil leaks? (oil filter housing is a known weak point on both)
7
Engine Warning Light
Have codes been read? Any unresolved HPFP, chargepipe, PCV, or cooling system 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 640i pitfalls.

Engine Codes

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

N55B30A (3.0L Straight-Six Turbo)

Years: 2011–2018
Power: 320 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 Code	Years	Power	2025 Enquiries	Avg. Recon Cost
N55B30A (3.0L Straight-Six Turbo)	2011–2018	320 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)	2017–2019	340 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 BMWGet quotes from trusted UK specialists in minutes.

Market Intelligence

Real data from thousands of 640i enquiries in 2025.

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]

Most Requested Engine Code

N55B30A / B58B30

[PATTERN DATA]

Peak Enquiry Season

Winter

Cold starts expose HPFP and PCV issues

[PATTERN DATA]

Regional Demand

London: 20%
South East: 18%
North West: 12%
Other Regions: 50%

[PATTERN DATA]

Regional Demand Breakdown

20%London18%South East12%North West50%Other Regions

Frequently Asked Questions

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.

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.

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.

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

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.

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.

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.

Why UK BMW 640i Owners Trust BMWEngines.uk

Trusted 640i Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 640i owners, as part of the Engine Finders network, across both the N55 and B58 eras — from the F06/F12/F13 to the G32 Gran Turismo.
Compare 640i Engine Replacement Companies
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.
UK Engine Replacement Services for 640i
supply-only or full supply & fit available nationwide, covering every 640i generation — and we're vetted across both the N55 and B58 engine families.

Find the best BMW 640i engine replacement UK drivers rely on.

Compare prices from trusted specialists on EnginesMarket today and get your 6 Series back on the road with confidence.

Compare BMW 640i Engine Prices Now

100% FreeNo hidden fees
No ObligationGet quotes with zero pressure
UK Specialists20+ vetted experts
12-Month WarrantyAs standard
Nationwide DeliverySupply & fit available

BMW 640i Engine Replacement —Compare Prices &Get Quotes

The 640i Through Time — Era Map

BMW 640i Engine Replacement Costs

Common Problems With BMW 640i Engines

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

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

3. PCV Valve Failure — B58(G32)

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

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

3. PCV Valve Failure — B58(G32)

Ready to Compare?

640i — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This 640i? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 640i Owners Trust BMWEngines.uk

Trusted 640i Engine Suppliers

Compare 640i Engine Replacement Companies

UK Engine Replacement Services for 640i

BMW 640i Engine Replacement —Compare Prices &
Get Quotes