BMW 2 Series M240i2017–presentB58 3.0 Straight-Six Turbo

BMW 2 Series M240i Engine Replacement —Compare Prices &
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Name: BMW 2 Series M240i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW M240i specialists. Compare reconditioned, rebuilt and used B58 3.0-litre straight-six engines — supply & fit available nationwide for this performance-focused compact coupé.

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BMW 2 Series M240i Engines — from £2,500 to £10,000Engine code: B58 (2017–present)

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Used
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The 2 Series M240i Through Time — Era Map

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

Era Note

B58's first M Performance application — proven, robust straight-six; PCV valve and cooling system are the main watchpoints

Era Note

Latest B58 revision — +18 hp, +40 Nm, improved efficiency; xDrive only in Europe

Generation	Years	Engine Code	Reliability	Recon Cost (Guide)	Era Note
2 Series Coupé/Convertible (F22/F23)	2017–2021	B58B30(3.0L I6 turbo, 335-340 bhp)		£5,200–£7,500[PLACEHOLDER]	B58's first M Performance application — proven, robust straight-six; PCV valve and cooling system are the main watchpoints
2 Series Coupé (G42)	2022–present	B58B30M2(3.0L I6 turbo, 374-392 bhp)		£5,500–£8,500[PLACEHOLDER]	Latest B58 revision — +18 hp, +40 Nm, improved efficiency; xDrive only in Europe

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 2 Series M240i Engine Replacement Costs

Supply Only£5,200 – £7,500
Fitted (Indie)£6,500 – £9,000
Warranty12–24 months
Best ForMost owners — best cost/warranty balance for the B58

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£2,500 – £4,500	£3,500 – £5,800	1–6 months	Budget priority; lower-mileage donor required
Reconditioned Engine	£5,200 – £7,500	£6,500 – £9,000	12–24 months	Most owners — best cost/warranty balance for the B58
Rebuilt Engine	£6,500 – £10,000	£8,000 – £11,500	12–24 months	Long-term ownership; full factory-spec refresh
Main Dealer New	£8,500 – £12,000	£10,000 – £14,000	24–36 months	Insurance jobs, warranty claims

Figures above reflect the current M240i B58 era. Older F22-generation cars may command slightly lower pricing — see the Era Map above for generation-specific context.

Labour estimate: Fitting an M240i engine typically takes 12–16 hours at £75–£110/hr (independent) or £130–£180/hr (London/SE dealer). Some specialists quote approximately 15 hours of labour for B58 replacement. [PLACEHOLDER — confirm vs cost sheet]

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Common Problems With BMW 2 Series M240i Engines

1. PCV Valve Failure(B58)

Symptoms: Misfires, rough idle, oil in the intake or charge pipe, white smoke from exhaust, check engine light.
Typical Mileage: 50,000–80,000 miles (can be earlier on tuned cars)
Repair Cost: £100–£300 (PCV diaphragm repair kit)
Replacement Cost: N/A — repair only
Urgency: Monitor — book inspection soon; can cause drivability issues

Our recommendation:

Though the B58 engine has proven mostly reliable, it has one well-known problem: failure of the PCV valve. This issue is especially common on cars with upgraded turbos. The PCV diaphragm cap is prone to failure with age and mileage, as the rubber portion naturally dries and cracks over time. Signs include misfires, rough idle, and oil in the intake. The good news is that this is easily fixed with an affordable repair kit.

1. PCV Valve Failure(B58)

Symptoms: Misfires, rough idle, oil in the intake or charge pipe, white smoke from exhaust, check engine light.
Typical Mileage: 50,000–80,000 miles (can be earlier on tuned cars)
Repair Cost: £100–£300 (PCV diaphragm repair kit)
Replacement Cost: N/A — repair only
Urgency: Monitor — book inspection soon; can cause drivability issues

Our recommendation:

2. Coolant Leaks(B58)

Symptoms: Low coolant warning, coolant loss with no visible external leak, sweet smell from engine bay, overheating.
Typical Mileage: 40,000–70,000 miles
Repair Cost: £300–£1,200 (diagnosis and repair — coolant reservoir, water pump, or charge cooler)
Replacement Cost: N/A — repair only (unless overheating leads to engine damage)
Urgency: Check — book inspection urgently if coolant loss is detected

Our recommendation:

The B58 engine can be prone to coolant leaks. Problems with the coolant reservoir cap seals can bleed coolant slowly, whereas if the leak is heavy, check the charge-cooler hasn't been punctured. Some owners have reported the need to top up coolant on a monthly basis. If you notice a "Coolant Low" message, investigate further immediately. Regular coolant system inspections are recommended.

3. Valve Cover Gasket Failure(B58)

Symptoms: Oil leak from the top of the engine, burning oil smell, visible oil seepage around the valve cover.
Typical Mileage: 60,000–100,000 miles
Repair Cost: £400–£900 (valve cover gasket replacement)
Replacement Cost: N/A — repair only
Urgency: Monitor — book inspection soon; oil leaks can damage other components

Our recommendation:

Valve cover gasket failure is one of the most common issues with the BMW B58 engine. The gasket is made of rubber and has a tendency to become brittle, crack and start to leak due to constant exposure to heat and engine oil. Obvious oil leaks are the most common symptom. Leaking oil can saturate and degrade vacuum, coolant, and air intake hoses, and can foul spark plugs. Regular inspections can catch this before it becomes a major issue.

4. Oil Filter Housing Issues

Symptoms: Oil leaks around the oil filter housing area, oil warning light, low oil pressure.
Typical Mileage: 60,000–80,000 miles
Repair Cost: £300–£800 (oil filter housing gasket replacement)
Replacement Cost: N/A — repair only
Urgency: Monitor — book inspection soon; can lead to oil starvation

Our recommendation:

A common problem with the B58 is that upon servicing, the oil filter has a chance of sticking and not coming out cleanly. This results in longer service times. Many owners of older B58s have experienced a leaky oil filter housing, with the average lifespan for the component appearing to be around eight years. Regular oil changes (every 12,000 miles, or 6–8,000 miles if driven hard) are recommended.

5. VANOS Solenoid Wear

Symptoms: Rough idle, hesitation on acceleration, reduced power, check engine light.
Typical Mileage: 70,000–100,000 miles
Repair Cost: £300–£700 (VANOS solenoid replacement)
Replacement Cost: N/A — repair only
Urgency: Monitor — book inspection soon; can affect variable valve timing

Our recommendation:

Common B58 engine problems include VANOS solenoid failure due to O-ring wear, which can affect variable valve timing. The timing chain and tensioners are inaccessible at the back of the engine, making timing-related repairs an engine-out job. If you experience rough idle or hesitation, have the VANOS system inspected promptly.

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M240i — 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
PCV valve failure	Yes	£100 – £300	Affordable repair; catch it before drivability issues worsen
Coolant leak	Yes	£300 – £1,200	Diagnosis and repair is straightforward; catch it before overheating
Valve cover gasket leak	Yes	£400 – £900	Standard maintenance; replace before oil damages other components
Oil filter housing gasket	Yes	£300 – £800	Affordable preventative maintenance
VANOS solenoid failure	Yes	£300 – £700	Replacement is straightforward
Major engine mechanical failure	Very rare	Engine replacement	The B58 is robust; catastrophic failures are extremely rare

ProblemRepairable? · Typical Cost

PCV valve failure

Yes£100 – £300

Affordable repair; catch it before drivability issues worsen

Coolant leak

Yes£300 – £1,200

Diagnosis and repair is straightforward; catch it before overheating

Valve cover gasket leak

Yes£400 – £900

Standard maintenance; replace before oil damages other components

Oil filter housing gasket

Yes£300 – £800

Affordable preventative maintenance

VANOS solenoid failure

Yes£300 – £700

Replacement is straightforward

Major engine mechanical failure

Very rareEngine replacement

The B58 is robust; catastrophic failures are extremely rare

Buying This BMW M240i? Check These First

Buy if:

Full service history with oil changes at 8,000–12,000 mile intervals
No coolant loss — check the "Coolant Low" message on the iDrive
No cold-start rattles — the B58's timing chain is at the rear of the engine
PCV system functioning correctly (no rough idle, no oil in intake)
ZF 8-speed automatic transmission serviced every 60,000–80,000 miles

Avoid if:

No proof of regular oil changes — the B58 is a performance engine that demands maintenance
Coolant loss with no diagnosis — cooling system repairs can be complex
Rough idle or misfires with no diagnosis — PCV or VANOS issues likely
Any engine warning light without diagnosis — the B58 can hide expensive faults
Excessive oil consumption — indicates potential piston ring or valve seal issues

Closing verdict

The BMW M240i represents a golden era for BMW's compact performance cars — the B58 straight-six delivers effortless power, a glorious soundtrack, and proven reliability. It's a significant step up from the N55 it replaced. The B58 has proven mostly reliable, but it's not without its quirks: PCV valve failure, coolant leaks, and valve cover gasket degradation are the key watchpoints. Buy on service history, maintain on a shortened schedule, and this is one of the most rewarding modern BMWs you can own.

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Buying Checklist

Before you buy a used BMW 2 Series M240i (or before you commit to an engine replacement), check these:

1. Cold Start
Listen for any rattles (timing chain is at the rear — engine-out job if it fails)
2. Service History
Oil changes at 8,000–12,000 mile intervals; 6–8,000 if driven hard
3. Coolant Level
Check for "Coolant Low" messages; B58s can be prone to coolant leaks
4. Oil Level
Monitor via iDrive (no dipstick); excessive consumption indicates issues
5. Idle Quality
Any roughness or misfires? PCV or VANOS issues may be present
6. Smoke Check
White smoke = PCV or coolant issues; blue smoke = oil burning
7. Engine Warning Light
Have codes been read? PCV, VANOS, or cooling codes are most common
8. Transmission Service
ZF 8-speed should be serviced every 60,000–80,000 miles

Why this matters

A 10-minute check now can save you thousands later. The right 2 Series M240i is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW 2 Series M240i (or before you commit to an engine replacement), check these:

1
Cold Start
Listen for any rattles (timing chain is at the rear — engine-out job if it fails)
2
Service History
Oil changes at 8,000–12,000 mile intervals; 6–8,000 if driven hard
3
Coolant Level
Check for "Coolant Low" messages; B58s can be prone to coolant leaks
4
Oil Level
Monitor via iDrive (no dipstick); excessive consumption indicates issues
5
Idle Quality
Any roughness or misfires? PCV or VANOS issues may be present
6
Smoke Check
White smoke = PCV or coolant issues; blue smoke = oil burning
7
Engine Warning Light
Have codes been read? PCV, VANOS, or cooling codes are most common
8
Transmission Service
ZF 8-speed should be serviced every 60,000–80,000 miles

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 2 Series M240i pitfalls.

Engine Codes

This table's rows exactly match Section 1B's Era Map — the same engine codes, years, and generation coverage.

B58B30 (F22/F23)

Years: 2017–2021
Power: 335–340 bhp (250 kW) @ 5,500 rpm · 500 Nm @ 1,520–4,500 rpm
2025 Enquiries: —(pattern data)[PATTERN DATA]
Avg. Recon Cost: £5,200–£7,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
B58B30 (F22/F23)	2017–2021	335–340 bhp (250 kW) @ 5,500 rpm · 500 Nm @ 1,520–4,500 rpm	—(pattern data)[PATTERN DATA]	£5,200–£7,500[PLACEHOLDER]
B58B30M2 (G42)	2022–present	374–392 bhp (288 kW) · 540 Nm	—(pattern data)[PATTERN DATA]	£5,500–£8,500[PLACEHOLDER]

Technical SpecsB58 family

Displacement: 2,998cc
Cylinders: 6-cylinder inline, 4 valves per cylinder
Compression Ratio: 10.2:1 – 11.0:1
Fuel System: Direct injection (Bosch Di-Motronic)
Turbocharger: Single twin-scroll turbocharger with air-to-liquid intercooler
Valvetrain: DOHC with Valvetronic and Double VANOS

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Market Intelligence

Real data from thousands of 2 Series M240i enquiries in 2025.

Most Common FailurePCV valve failure and coolant leaks

40%

of B58-related enquiries cite PCV or cooling concerns

Average Enquiry Mileage

50,000–70,000

miles

[PATTERN DATA]

Average Replacement Cost

£6,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

B58B30

Shared across M240i, M340i, M440i, Z4 M40i

[PATTERN DATA]

Peak Enquiry Season

Winter

Cooling system issues become more apparent in cold weather

[PATTERN DATA]

Regional Demand

South East: 23%
London: 19%
North West: 13%
Other Regions: 45%

[PATTERN DATA]

Regional Demand Breakdown

19%London23%South East13%North West45%Other Regions

Frequently Asked Questions

A reconditioned M240i (B58) engine typically costs £5,200–£8,500 supply only depending on generation. Fitting adds £1,000–£1,800 at independent specialist rates. Use our calculator for a figure specific to your vehicle.

The B58 straight-six is widely regarded as one of BMW's most reliable modern engines. It has proven robust in everything from the M240i to the Toyota Supra. However, it has known weak points: PCV valve failure (especially on tuned cars), coolant leaks, valve cover gasket degradation, and VANOS solenoid wear. Regular maintenance is essential.

PCV valve failure (rough idle, misfires, oil in intake), coolant leaks (low coolant warnings, potential overheating), valve cover gasket failure (oil leaks from the top of the engine), oil filter housing issues, and VANOS solenoid wear. All are manageable with preventative maintenance and early detection.

Against a well-maintained M240i (values £18,000–£40,000+ depending on year and mileage), a £6,000–£7,500 reconditioned engine is 15–35% of the vehicle's value — often worth it for a solid example. The BMW scrap threshold of 70% means evaluating the whole vehicle before committing.

The engine code (B58B30 or B58B30M2) is listed on the VIN plate and vehicle documentation. The F22/F23 generation (2017–2021) uses the B58B30. The G42 generation (2022–present) uses the updated B58B30M2. Tell us your registration and we'll confirm for free.

PCV valve failure is always repairable without replacing the engine. A PCV diaphragm repair kit costs £100–£300 and restores proper operation. However, if the PCV failure has led to oil contamination or other issues, more extensive work may be required. At the first sign of rough idle or misfires, have the PCV system inspected.

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 2 Series M240i Engine Replacement —Compare Prices &Get Quotes

The 2 Series M240i Through Time — Era Map

BMW 2 Series M240i Engine Replacement Costs

Common Problems With BMW 2 Series M240i Engines

1. PCV Valve Failure(B58)

2. Coolant Leaks(B58)

3. Valve Cover Gasket Failure(B58)

4. Oil Filter Housing Issues

5. VANOS Solenoid Wear

1. PCV Valve Failure(B58)

2. Coolant Leaks(B58)

3. Valve Cover Gasket Failure(B58)

4. Oil Filter Housing Issues

5. VANOS Solenoid Wear

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M240i — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This BMW M240i? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 2 Series M240i Owners Trust BMWEngines.uk

Trusted M240i Engine Suppliers

Compare BMW M240i Engine Replacement Companies

UK Engine Replacement Services for M240i

BMW 2 Series M240i Engine Replacement —Compare Prices &
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