BMW 2 Series M240i Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW 2 Series M240i engine specialists. Compare prices on reconditioned, rebuilt and used engines for your BMW M240i - the 340hp+ flagship M Performance Coupe and Convertible with BMW's legendary B58 or N55 straight-six.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £2,800 to £5,200
Used from £1,800 · Reconditioned from £2,800 · Common codes: N55B30, B58B30M0, B58B30O1, B58B30A, B58B30B
From £1,800
Tested, bare/short engine
From £2,800
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW 2 Series M240i Replacement Engineto Finding the Best BMW 2 Series M240i Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 2 Series M240i - Engine History & Specs at a Glance
The BMW 2 Series M240i arrived in 2017 as the replacement for the M235i, bringing BMW's new modular B58 3.0-litre inline-six turbo engine to the F22 Coupe and F23 Convertible. The M240i badge represented a significant step up in performance, with the B58 delivering 335-340hp compared to the M235i's 326hp N55. The G42 generation M240i (2021-present) took performance to another level with 374hp from an updated B58.
Variant HistoryBMW 2 Series M240i - Engine History & Specs at a Glance
The BMW 2 Series M240i arrived in 2017 as the replacement for the M235i, bringing BMW's new modular B58 3.0-litre inline-six turbo engine to the F22 Coupe and F23 Convertible. The M240i badge represented a significant step up in performance, with the B58 delivering 335-340hp compared to the M235i's 326hp N55. The G42 generation M240i (2021-present) took performance to another level with 374hp from an updated B58.
BMW 2 Series M240i
Fuel TypePetrol
Engine Size3.0L (2,998cc)
Power Output Range326-374hp across the variant's historyEngine History Timeline
B58B30M0 3.0L turbo inline-six, 335-340hp, 500Nm (F22 Coupe, F23 Convertible launch, replaced N55)
B58B30M0 with xDrive 335-340hp, 0-62mph in 4.4 seconds
B58B30O1 3.0L turbo inline-six, 374hp, 500Nm (G42 Coupe launch, xDrive standard in many markets)
B58B30O1 rear-wheel-drive 374hp, 0-62mph in 4.7 seconds
B58B30O1 374hp (G42 LCI update, mild-hybrid introduced)
Key Specs Snapshot
Fuel TypePetrolEngine Size3.0L (2,998cc)Power Output Range326-374hp across the variant's historyTorque Range450-500Nm0-62mph4.3-5.0 seconds (depending on transmission and drivetrain)Years Produced2017-presentEvery engine fitted to the BMW 2 Series M240i is covered below, with UK rebuilt pricing and known failure points.
BMW 2 Series M240i Engine Codes - Specifications & Replacement CostBMW 2 Series M240i Engine Codes - Specifications & Replacement Cost
3.0L Petrol (2014-2016, M235i era - predecessor to M240i)
Power Output326hp (240kW)Torque450NmYears Fitted2014-2016
Compatible Trim Levels
- M235i
- M235i M Performance
- M235i xDrive
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£1,600-£2,200
Reconditioned
Addressed known issues, tested
£2,400-£3,200
Rebuilt
Full teardown, upgraded internals
£3,000-£4,200
Common Failure
The N55's plastic charge pipe is notoriously prone to cracking under boost pressure. Oil starvation under sustained hard cornering is also documented. Plastic oil filter housing can leak.
The BMW 2 Series M240i has been powered by two generations of 3.0-litre inline-six engines: the earlier N55 (2014-2016 M235i) and the B58 (2017-present M240i). The N55 suffers from plastic charge pipe failure and oil starvation under hard use, while the B58 - widely regarded as one of BMW's best modern engines - has its own plastic component weaknesses including the oil filter housing and water pump. Rebuilt engines through EnginesMarket include upgraded components addressing the original failure point, plus a minimum 12-month unlimited-mileage warranty.
Why the BMW 2 Series M235i/M240i N55 Engine Loses Boost
Affected Vehicles
BMW 2 Series M235i (N55B30, 2014-2016) - predecessor to M240i
Typical Failure Mileage
40,000-80,000 miles
Root Cause
The N55's plastic charge pipe is notoriously prone to cracking under boost pressure. The OEM charge pipes used on the N55 engine are plastic, which becomes brittle and weak after time and repeated heat cycles. Once the charge pipe cracks, the engine loses boost pressure, triggering a drivetrain malfunction warning.
Why It Happens
The N55's plastic charge pipe is notoriously prone to cracking under boost pressure. The OEM charge pipes used on the N55 engine are plastic, which becomes brittle and weak after time and repeated heat cycles. Once the charge pipe cracks, the engine loses boost pressure, triggering a drivetrain malfunction warning.
Dealer (parts + labour)
£600-£1,000
Specialist (parts + labour)
£350-£650
What it involves
Replace with upgraded aluminium pipe
Suitability
Effective; upgraded unit eliminates future failure
1 - 2 daysDealer (parts + labour)
£300-£600
Specialist (parts + labour)
£150-£350
What it involves
Check turbo, wastegate, boost hoses
Suitability
Recommended if boost issues persist
1 - 2 daysDealer (parts + labour)
£5,000-£7,000
Specialist (parts + labour)
£3,000-£4,200
What it involves
Supply & fit, upgraded components, 12-month warranty
Suitability
Required if boost loss has caused engine damage
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Charge pipe replacement Minor | £600-£1,000 | £350-£650 | Replace with upgraded aluminium pipe | Effective; upgraded unit eliminates future failure | 1 - 2 days |
 Full turbo system inspection Best Value | £300-£600 | £150-£350 | Check turbo, wastegate, boost hoses | Recommended if boost issues persist | 1 - 2 days |
Full Replacement - rebuilt/reconditioned engine Best Value | £5,000-£7,000 | £3,000-£4,200 | Supply & fit, upgraded components, 12-month warranty | Required if boost loss has caused engine damage | 1 - 2 days |
Our Recommendation
Our Recommendation
Charge pipe failure is a well-known weakness on the N55. Upgrading to an aluminium charge pipe is a relatively inexpensive fix that prevents future failure. If the engine has suffered catastrophic boost-related damage, a rebuilt engine with upgraded components is the safest option.
Don't Let Engine Failure Write Off Your BMW 2 Series M240i
The M240i's N55 and B58 straight-six engines are among BMW's finest, but plastic component failures - charge pipes on the N55, oil filter housings and water pumps on the B58 - can escalate quickly if ignored. With rebuilt engines available from £3,000, a 12-month warranty on every unit, and nationwide delivery and fit options, replacing your M240i engine through EnginesMarket is often more cost-effective than main dealer repairs.
Compare rebuilt N55B30 BMW 2 Series M240i engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
BMW 2 Series M240i Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 2 Series M240i engine replacement cost in the UK-
A BMW 2 Series M240i engine replacement typically costs between £2,800 and £5,200 depending on the condition (used, reconditioned, or rebuilt) and the specific engine code. Used engines start from around £1,800, reconditioned units from £2,800, and fully rebuilt engines with a 12-month warranty from £3,000. Labour for supply and fit adds approximately £800-£1,500 depending on the workshop. Main dealer replacement costs can exceed £4,200.
- Used: £1,800-£2,800
- Reconditioned: £2,800-£4,200
- Rebuilt: £3,000-£5,200
Question 2What are the signs of oil filter housing failure in a BMW 2 Series M240i-
The most common symptoms are coolant loss without visible external leaks, oil contamination (milky appearance), and a sweet smell from the engine bay. The B58's plastic oil filter housing is prone to cracking, which can lead to oil and coolant mixing - a known potentially catastrophic problem. If left unchecked, this can cause bearing failure and engine seizure.
- Coolant loss is the primary symptom
- Oil may appear milky (coolant contamination)
- Ignoring it can lead to catastrophic engine failure
Question 3Is it worth replacing the engine in a BMW 2 Series M240i-
It depends on the vehicle's value and the extent of the damage. For an F22 M240i (2017-2021) worth £18,000-£28,000, a reconditioned engine at £2,800-£3,800 is often worthwhile if you plan to keep the car. For G42 models (2021+) worth £25,000-£45,000, replacement is almost always justified. If the car is worth under £5,000, a used engine or repair may be more cost-effective.
- Vehicle value is the key deciding factor
- Rebuilt engines come with a 12-month warranty for peace of mind
- Compare quotes to find the best value option
Question 4How long does a BMW 2 Series M240i engine replacement take-
A typical BMW 2 Series M240i engine replacement takes 3-5 working days from order to completion, assuming the engine is in stock. Supply-only orders are usually dispatched within 1-2 working days. Supply and fit through our specialist network typically takes 3-5 days, including delivery, fitting, and ECU calibration.
- Supply only: 1-2 days
- Supply and fit: 3-5 working days
- Timelines vary by workshop and engine availability
Question 5What's the difference between the M235i and the M240i-
The BMW M235i (2014-2016) uses the N55 3.0-litre inline-six producing 326hp, while the M240i (2017-2021) uses the newer B58 3.0-litre inline-six producing 335-340hp. The M240i replaced the M235i in the F22/F23 generation. The G42 M240i (2021-present) uses an updated B58 producing 374hp.
- M235i (F22): N55 3.0L I6, 326hp
- M240i (F22): B58 3.0L I6, 335-340hp
- M240i (G42): B58 3.0L I6, 374hp
Question 6Will a replacement BMW 2 Series M240i engine pass the MoT-
Yes - all engines supplied through EnginesMarket are MoT emissions compliant. Rebuilt and reconditioned engines are tested to ensure they meet the original emissions standards for the vehicle's year. For M240i models with OPF (Otto Particulate Filter), compliance is confirmed before dispatch.
- All engines meet OEM emissions standards
- Rebuilt units include upgraded components
- MoT readiness is confirmed before supply
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