Engines Market

BMW M140i SPECIALISTS

BMW 1 Series M140i Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK BMW 1 Series M140i engine specialists. Compare prices on reconditioned, rebuilt and used engines for your BMW M140i - the 340 hp B58 turbocharged straight-six that defined the final rear-wheel-drive M Performance hatchback. Covering the B58B30 engine across the F20 and F21 generations from 2016 to 2019.

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BMW 1 Series M140i Engine
from£3,500 to £8,500...
  • Usedfrom £2,500
  • Reconditionedfrom £3,500
  • Common codesB58B30A, B58B30M0, B58B30O0
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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

BMW 1 Series M140i Engine History & Specs at a Glance

The BMW M140i was launched in the summer of 2016 as the flagship performance model of the second-generation 1 Series, replacing the M135i. Powered by BMW's all-new B58 3.0-litre turbocharged straight-six producing 340 hp, it represented the pinnacle of the rear-wheel-drive hatchback era. With 500 Nm of torque, a 0-62 mph time of just 4.6 seconds (automatic) and the legendary chassis balance of the F20/F21, the M140i remains one of the most celebrated modern BMWs. Production ran from 2016 to 2019 across the F20 (five-door) and F21 (three-door) body styles.

BMW 1 Series M140i
  1. 2016

    B58B30M0, 3.0L single twin-scroll turbo straight-six, 340 hp (250 kW), launched with the F20 five-door and F21 three-door 1 Series

  2. 2016

    Optional xDrive all-wheel drive introduced alongside rear-wheel drive

  3. 2017

    Shadow Edition models introduced with extended black exterior styling

  4. 2018

    Production continues; B58 engine now well-established as one of BMW's most reliable six-cylinders

  5. 2019

    F20/F21 generation ends; the M140i badge is retired and replaced by the front-wheel-drive 128ti and M135i xDrive on the F40 platform

Every engine fitted to the BMW 1 Series M140i is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW 1 Series M140i Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

B58B30M0 — 3.0L Turbocharged Petrol (2016-2019) engine

B58B30M0 — 3.0L Turbocharged Petrol (2016-2019)

Power Output
340 hp (250 kW) @ 5,500 rpm
Torque
500 Nm @ 1,500-4,500 rpm
Displacement
2,998 cc
Bore x Stroke
84.0 mm x 94.6 mm
Compression Ratio
11.0:1
Engine Code Variants
B58B30A, B58B30M0
Years Fitted
2016-2019

Can’t find your exact engine code?-> Get quotes for B58B30M0 BMW 1 Series M140i engine replacement

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Common Problems

BMW 1 Series M140i Engine Problems Repair Cost vs Replacement

The BMW 1 Series M140i is powered exclusively by the B58B30 engine - a 3.0-litre single twin-scroll turbocharged straight-six that produces 340 hp and 500 Nm of torque. The B58 is widely regarded as one of BMW's most reliable modern engines, with far fewer major failure points than the N54 and fewer issues than the early N55. However, early production examples (2016-2018) have a well-documented weakness: the oil pump drive system. Coolant leaks, valve cover gasket wear and VANOS solenoid issues are also reported on higher-mileage cars. Replacement demand for the BMW M140i is relatively low compared to four-cylinder BMWs, but when failures occur, the cost of repair can be significant. Every rebuilt engine supplied through EnginesMarket includes upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

Oil Pump Drive Gear Failure

Affected
BMW 1 Series M140i (B58B30, early production 2016-2018)
Typical failure mileage
30,000-80,000 miles
Root cause
Early production B58 engines (2016-2018) used plastic components in the oil pump chain guide and tensioner. Under normal operating stress, these plastic parts can break, throwing off the tension on the oil pump chain and leading to inconsistent oil flow. A distinctive humming or whining noise from the engine, especially during cold starts, is the primary warning sign. If the oil pump fails, oil pressure drops rapidly, and the engine can suffer catastrophic damage within minutes.

Repair options

Repair tierDealer priceSpecialist price
Oil Pump Drive Gear Replacement£2,000-£3,000£1,200-£2,000
Full Replacement - rebuilt/reconditioned engine£7,000-£10,000£4,500-£8,500 (matches Section 4 rebuilt pricing)
Our recommendation
If your B58-powered M140i produces a humming or whining noise from the engine on cold start, have the oil pump drive system inspected immediately. Early detection can prevent catastrophic engine failure. BMW has repaired this issue under warranty for many affected vehicles, but if your car is out of warranty, a specialist repair is significantly cheaper than a full engine replacement. For owners planning to keep their M140i for the long term, upgrading to an aftermarket metal oil pump drive gear is a worthwhile preventative measure.
-> Compare rebuilt B58B30M0 BMW 1 Series M140i engine prices

Coolant Leaks

Affected
BMW 1 Series M140i (B58B30, all production years)
Typical failure mileage
30,000-80,000 miles
Root cause
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. There are two coolant tanks on the M140i - one for the engine and a smaller one for the charge cooler.

Repair options

Repair tierDealer priceSpecialist price
Coolant Reservoir Cap Replacement£50-£100£20-£50
Charge-Cooler Replacement£800-£1,500£500-£1,000
Full Replacement - rebuilt engine£7,000-£10,000£4,500-£8,500
Our recommendation
Coolant leaks on the B58 are usually repairable without engine replacement. If you see a "Coolant Low" message, investigate immediately. Start with the simplest fix - a faulty expansion cap is a common and cheap cause. Later cars came with rock guards to prevent radiator punctures from stones, so check if your car has these fitted.
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Valve Cover Gasket & VANOS Solenoid Wear

Affected
BMW 1 Series M140i (B58B30, higher-mileage examples, 60,000-100,000 miles)
Typical failure mileage
60,000-100,000 miles
Root cause
The B58's valve cover gasket can degrade over time due to high engine temperatures, leading to oil leaks that can create a burning smell and, in severe cases, pose a fire hazard. VANOS solenoids can also fail due to oil contamination or wear, leading to rough idling, loss of power and increased fuel consumption.

Repair options

Repair tierDealer priceSpecialist price
Valve Cover Gasket Replacement£700-£1,000£400-£650
VANOS Solenoid Replacement£500-£800£300-£500
Full Replacement - rebuilt engine£7,000-£10,000£4,500-£8,500
Our recommendation
Valve cover gasket and VANOS issues on the B58 are usually repairable without engine replacement. A diagnostic scan will identify if VANOS codes are present. Address oil leaks promptly - a £400-£650 specialist repair is far cheaper than dealing with the consequences of a major oil leak. Unlike the N20, the B58 does not have widespread timing chain issues, making it a more dependable choice for long-term ownership.
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Injector & PCV Diaphragm Failure

Affected
BMW 1 Series M140i (B58B30, all production years)
Typical failure mileage
Variable - injector issues are not mileage-dependent
Root cause
The B58's injectors can fail, with issues seemingly unrelated to mileage. The PCV (Positive Crankcase Ventilation) diaphragm can also fail, causing rough running and potentially a whistling noise. The PCV diaphragm is a cheap and easy DIY fix.

Repair options

Repair tierDealer priceSpecialist price
PCV Diaphragm Replacement£200-£400£20-£50 (DIY)
Fuel Injector Replacement£600-£1,200£400-£800
Full Replacement - rebuilt engine£7,000-£10,000£4,500-£8,500
Our recommendation
PCV diaphragm failure is a cheap and easy fix - many owners have reported fixing it themselves for under £20. Injector issues should be diagnosed with a proper scan; replace faulty units individually rather than assuming the worst.
-> Compare rebuilt BMW 1 Series M140i engine prices

Don't Let Engine Issues Write Off Your BMW 1 Series M140i

The B58 engine in your BMW M140i is one of BMW's most celebrated turbocharged straight-sixes - a reliable, characterful engine that deserves proper maintenance. Early production oil pump issues, coolant leaks and valve cover gasket wear are the most common problems, and all are repairable without replacing the entire engine in most cases. Whether you need a preventative oil pump inspection or a full rebuilt engine with upgraded components and a 12-month warranty, EnginesMarket connects you with vetted UK specialists who know the B58 inside out. Compare prices today and keep your BMW on the road.

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FAQ

BMW 1 Series M140i Engine ReplacementFrequently Asked Questions

Everything BMW 1 Series M140i owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

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Comparing quotes for your BMW 1 Series M140i engine replacement is completely free and carries no obligation. Enter your registration above, tell us your preferred engine condition - used, reconditioned or rebuilt - and receive tailored quotes from vetted UK specialists who know the B58 straight-six engine inside out. No spam, no pressure, just genuine prices from trusted BMW M140i experts.

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