How much does a BMW 2 Series 230i engine replacement cost in the UK?

A reconditioned BMW 2 Series 230i engine (B48B20) typically costs £3,800–£6,500 supply only. Fitting adds £1,000–£1,500. These are specialist-only replacements - the B48 requires BMW specialist expertise. A water pump replacement costs £400–£1,000.

Is the BMW 2 Series 230i reliable?

Yes - the B48 is a robust and well-developed engine that's significantly improved over the N20. The timing chain is now front-mounted, virtually eliminating the N20's chain issues. Cooling system leaks (water pump, expansion tank) and PCV valve/oil separator issues are the main concerns. Regular oil changes (8,000–10,000 miles) are essential.

What are the common problems with the BMW 2 Series 230i?

Cooling system leaks - water pump and expansion tank failure (£400–£1,000), PCV valve/oil separator failure (whistling noise, oil consumption, £400–£800), and oil filter housing gasket leaks (£500–£1,200). The B48 is otherwise exceptionally robust.

Is it worth replacing a BMW 2 Series 230i engine, or should I scrap the car?

2 Series 230i values range from £12,000–£35,000 depending on generation, condition and mileage. A £3,800–£6,500 reconditioned engine represents 15–55% of vehicle value - our 70% BMW scrap threshold means careful evaluation is required. For a well-maintained G42 example, replacement is often justified. For an ageing F22 with other issues, assess scrap value first.

How do I find my BMW 2 Series 230i engine code?

The 230i uses the B48B20 engine code - BMW's 2.0-litre four-cylinder turbo. F22/F23 (2014–2020) is the earlier 245bhp variant; G42 (2021–present) is the 255bhp version. The code is stamped on the engine block; your VIN and vehicle documentation will also confirm the specification.

Can I repair the cooling system leak, or does it need replacement?

Yes - water pump and expansion tank replacement (£400–£1,000) is a straightforward repair on the B48. The water pump is known to fail with age. Replacing both the water pump and expansion tank together is recommended - they degrade at similar rates. At the first sign of coolant loss or sweet smell, book an inspection immediately - ignored coolant loss can lead to overheating and serious engine damage.

BMW 2 Series 230i2014–present2.0L Turbo Petrol

BMW 2 Series 230i Engine Replacement — Compare Prices & Get Quotes

Name: BMW 2 Series 230i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW specialists. The 230i is the refined 2.0-litre B48 turbo petrol - smooth, responsive and efficient. Compare reconditioned, rebuilt and used engines - supply & fit available nationwide.

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BMW 2 Series 230i Engines - from £2,800 to £8,500Code: B48B20

BMW 2 Series 230i Engines - from £2,800 to £8,500· Code: B48B20

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BMW 2 Series 230i - Which Engine Does Your Car Actually Have?

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

Era Note

245bhp B48 - modern twin-scroll, chain front-mounted

GenerationYearsEngine CodeReliabilityRecon CostEra Note

F22/F23

2014–2020B48B20 (2.0L turbo)★★★★☆ [NEWLY ASSIGNED - see Data Note]£3,500–£6,000 [PLACEHOLDER - confirm vs cost sheet]245bhp B48 - modern twin-scroll, chain front-mounted

G42

2021–presentB48B20 (2.0L turbo, revised)★★★★☆ [NEWLY ASSIGNED - see Data Note]£3,500–£6,500 [PLACEHOLDER - confirm vs cost sheet]Same engine - minor refinement; 255bhp, improved cooling

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 2 Series 230i Engine Replacement Costs

Supply Only£3,800–£6,500

Fitted (Indie)£4,800–£7,900

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,800–£4,500£3,800–£5,9001–6 monthsBudget priority; lower-mileage donor

Reconditioned Engine£3,800–£6,500£4,800–£7,90012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£5,000–£8,500£6,000–£10,00012–24 monthsLong-term ownership; 5+ year horizon

Main Dealer New£8,500–£12,000£10,000–£13,50024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current G42 generation. Older F22/F23 pricing typically runs slightly lower on the used market. See the Era Map above for generation-specific pricing.

Labour estimate: Fitting a 2 Series 230i engine typically takes 8–12 hours at £70–£100/hr (independent BMW specialist) or £120–£170/hr (London/SE dealer). The B48's longitudinal mount makes it relatively accessible.

→ Compare BMW 2 Series 230i engine prices from UK specialists

Common Problems With BMW 320d Engines

1. Cooling System Leaks (Water Pump / Expansion Tank)

2. PCV Valve / Oil Separator Failure

3. Oil Filter Housing Gasket Leak

Weighing Your Options?

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20+ vetted BMW specialists, covering the B48 230i, with a 12-month warranty as standard.

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BMW 2 Series 230i - 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.

BMW 2 Series 230i - 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 SenseCooling system leaks✅ Yes£400–£1,000Straightforward - always worth doingPCV valve/oil separator failure✅ Yes£400–£800Viable on any well-maintained 230iOil filter housing gasket leak✅ Yes£500–£1,200Preventative maintenance on higher-mileage examplesVANOS solenoid wear✅ Yes£300–£600Simple replacement - cheap preventative maintenanceMajor internal failure (crank/block)❌ Usually NoEngine replacement requiredReplacement often £3,800–£6,500 - assess vehicle value carefully

Buying This BMW 2 Series 230i? Check These First

Buy If

Full BMW service history with documented oil changes (8,000–10,000 miles)
Cooling system history - water pump and expansion tank checked
No whistling from the engine (PCV valve) and no coolant loss
G42 (post-2021) if you want the latest refinement and power

Avoid If

Any evidence of coolant loss or overheating (cooling system risk)
Whistling noise from the engine (PCV valve failure)
Poor service history - the B48 is robust but needs proper oil
Engine warning light with no diagnosis - these engines can hide expensive problems

Closing Verdict

The 230i is a genuine driver's car - a light, rear-driven coupe with BMW's excellent B48 four-cylinder. It's a significant step forward from the N20, with timing chain issues virtually eliminated. Cooling system maintenance is the key to longevity - a £400–£1,000 water pump replacement is small change on a car worth £15,000–£35,000. Buy on history, maintain the cooling system, and the 230i will reward you.

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

→ Compare BMW 2 Series 230i 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 BMW 2 Series 230i engine prices before you buy

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Buying Checklist

Before you buy a used BMW 2 Series 230i (or before you commit to an engine replacement), check these:

Cold Start

Listen for any rattle; the B48 should start smoothly

Service History

8,000–10,000 mile oil changes are essential for the B48

Coolant Level

Check for any loss - water pump and expansion tank are key risks

PCV Valve

Any whistling from the engine? Increased oil consumption?

Oil Filter Housing

Any oil leaks at the front of the engine?

VANOS Operation

Check low-end torque and smooth power delivery

Engine Warning Light

Have codes been read? Resolve before buying

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.

B48B20 (2.0L turbo)

Years2014–2020

Power245 bhp

2025 Enquiries- (pattern data - premium petrol)

Avg. Recon Cost£3,800–£6,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

B48B20 (2.0L turbo)2014–2020245 bhp- (pattern data - premium petrol)£3,800–£6,000 [PLACEHOLDER]

B48B20 (2.0L turbo, revised)2021–present255 bhp- (pattern data - premium petrol)£4,000–£6,500 [PLACEHOLDER]

Technical Specs

B48B20

Displacement1,998 cc

Cylinders4-cylinder inline

Compression Ratio10.2:1

Fuel SystemDirect injection

TurbochargerSingle twin-scroll

Additional specifications (F22/F23)

Maximum torque350 Nm @ 1,200–4,500 rpm

0–60mph5.6 seconds (manual) / 5.4 seconds (auto)

Top speed155 mph (limited)

Additional specifications (G42)

Maximum torque400 Nm @ 1,600–4,500 rpm

0–60mph5.3 seconds (auto)

Top speed155 mph (limited)

Transmission8-speed automatic (ZF 8HP50) or 6-speed manual (F22/F23 only)

DriveRear-wheel drive (xDrive optional on G42)

Kerb weight1,435–1,555 kg

→ Compare BMW 2 Series 230i engine prices for your BMW

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Market Intelligence

Most Common Failure

Cooling system leaks

water pump and expansion tank failures account for ~45% of B48 coolant-related enquiries

[PATTERN DATA - specialist workshop consensus]

Average Enquiry Mileage

45,000

miles

[PATTERN DATA]

Average Replacement Cost

£5,000

reconditioned, supply only

[PLACEHOLDER - confirm vs cost sheet]

Most Requested Engine Code

B48B20

the 230i is the core petrol coupe variant

[PATTERN DATA]

Peak Enquiry Season

Spring/Summer

coupe buyers prepare for summer driving

[PATTERN DATA]

Regional Demand

South East22%

London18%

South West15%

PATTERN DATA

Regional Demand Breakdown

22%South East

18%London

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 2 Series 230i Owners Trust BMWEngines.uk

Trusted BMW 230i Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 2 Series owners, as part of the Engine Finders network, with specialist knowledge of the B48 four-cylinder and its cooling system requirements.
Compare BMW 230i Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with transparent pricing for both F22/F23 and G42 generations.
UK Engine Replacement Services for BMW 230i
supply‑only or full supply & fit available nationwide, covering the 2 Series Coupe and Convertible with specialists who understand this refined B48 engine.

Find the best BMW 2 Series 230i engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

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No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available