BMW X3 G01 30i Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW X3 G01 30i engine specialists. Compare prices on reconditioned, rebuilt and used engines for your third-generation X3 30i - supply and fit available across the UK.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £1,800 to £3,800
Used from £1,500 · Reconditioned from £1,800 · Common codes: B48B20, B48B20A, B48B20B
From £1,500
Tested, bare/short engine
From £1,800
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 X3 G01 30i Replacement Engineto Finding the Best BMW X3 G01 30i Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW X3 G01 30i - Engine History & Specs at a Glance
The BMW X3 G01 30i joined the third-generation X3 range as the mid-range petrol option, offering a responsive 2.0-litre turbocharged four-cylinder in an all-wheel-drive package. Over the G01 production run, the 30i badge carried the modular B48 engine family with a clear step up in power and refinement over the outgoing N20.
Variant HistoryBMW X3 G01 30i - Engine History & Specs at a Glance
The BMW X3 G01 30i joined the third-generation X3 range as the mid-range petrol option, offering a responsive 2.0-litre turbocharged four-cylinder in an all-wheel-drive package. Over the G01 production run, the 30i badge carried the modular B48 engine family with a clear step up in power and refinement over the outgoing N20.
BMW X3 G01 30i
Fuel TypePetrol
Engine Size2.0L (1,998cc)
Power Output252hp across the variant's historyEngine History Timeline
G01 generation launches; 30i debuts with B48B20 2.0-litre four-cylinder petrol, 252hp, 350Nm torque, all-wheel drive
xDrive30i M Sport becomes a popular UK trim level
B48B20 receives minor ECU calibration updates for improved throttle response
48V mild hybrid system introduced on some G01 variants (not all 30i models)
G01 LCI facelift; 30i continues with B48B20 now with 48V MHEV on some variants
G01 production ends; G45 generation launches with updated powertrains
Key Specs Snapshot
Fuel TypePetrolEngine Size2.0L (1,998cc)Power Output252hp across the variant's historyYears Produced2017-2024Every engine fitted to the BMW X3 G01 30i is covered below, with UK rebuilt pricing and known failure points.
BMW X3 G01 30i Engine Codes - Specifications & Replacement CostBMW X3 G01 30i Engine Codes - Specifications & Replacement Cost
2.0 Petrol (2017-2024)
Power Output252hp, 350Nm torqueYears Fitted2017-2024
Compatible Trim Levels
- xDrive30i SE
- xDrive30i Sport
- xDrive30i xLine
- xDrive30i M Sport
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£1,500-£2,800
Reconditioned
Addressed known issues, tested
£1,800-£3,800
Rebuilt
Full teardown, upgraded internals
£1,800-£3,800
Common Failure
Injector seal leaks causing fuel dilution of engine oil; coolant loss from various connections including the expansion tank; PCV system failure on higher-mileage units.
The BMW X3 G01 30i is powered by the B48B20 2.0-litre turbo petrol engine - part of BMW's modular B-series family. The B48 is generally reliable and capable of 150,000+ miles with proper maintenance. However, injector seal leaks, coolant system issues, and PCV system failure are the most common failure points. Every rebuilt engine supplied through EnginesMarket includes upgraded components addressing the original failure point, plus a minimum 12-month unlimited-mileage warranty.
Why the BMW X3 G01 30i B48 Suffers Leaks and Overheating
Affected Vehicles
BMW X3 G01 30i (B48B20, 2017-2024)
Typical Failure Mileage
40,000-80,000 miles
Root Cause
The factory plastic coolant expansion tank becomes brittle under repeated thermal cycling, leading to micro-fractures. Combined with thermostat housing degradation and coolant hose connection wear, this causes rapid coolant loss and potential head gasket stress.
Why It Happens
The factory plastic coolant expansion tank becomes brittle under repeated thermal cycling, leading to micro-fractures. Combined with thermostat housing degradation and coolant hose connection wear, this causes rapid coolant loss and potential head gasket stress.
Dealer (parts + labour)
£450-£700
Specialist (parts + labour)
£280-£450
What it involves
Replace leaking hoses, clamps, and thermostat housing assembly
Suitability
Short-term fix; expansion tank often fails next
1 - 2 daysDealer (parts + labour)
£800-£1,200
Specialist (parts + labour)
£550-£850
What it involves
Full drain, new expansion tank, water pump, thermostat, and pressure test
Suitability
Viable if caught before overheating; prevents further damage
1 - 2 daysDealer (parts + labour)
£4,500-£6,500
Specialist (parts + labour)
£2,800-£4,500
What it involves
Supply & fit, rebuilt unit with upgraded aluminium coolant components, coding, and full fluid flush
Suitability
Permanent solution; addresses head gasket risk
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 |
|---|---|---|---|---|---|
 Thermostat and hose replacement Minor | £450-£700 | £280-£450 | Replace leaking hoses, clamps, and thermostat housing assembly | Short-term fix; expansion tank often fails next | 1 - 2 days |
 Coolant system overhaul Best Value | £800-£1,200 | £550-£850 | Full drain, new expansion tank, water pump, thermostat, and pressure test | Viable if caught before overheating; prevents further damage | 1 - 2 days |
Full Replacement - rebuilt/reconditioned engine Best Value | £4,500-£6,500 | £2,800-£4,500 | Supply & fit, rebuilt unit with upgraded aluminium coolant components, coding, and full fluid flush | Permanent solution; addresses head gasket risk | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 2017-2024 BMW X3 G01 30i is worth approximately £15,000-£35,000. Replacement cost is typically small relative to vehicle value, making a rebuilt engine a viable option if needed.
Our Recommendation
Our Recommendation
If your BMW X3 G01 30i is losing coolant but shows no misfires or white exhaust smoke, a full coolant system overhaul (£550-£850 at a specialist) is highly cost-effective. However, if the temperature gauge has spiked or coolant has contaminated the oil, internal warping is likely occurring. At that stage, a rebuilt engine is the only reliable path.
Don't Let Engine Failure Write Off Your BMW X3 G01 30i
The BMW X3 G01 30i is a refined and responsive petrol SUV, but its cooling system, injector seals, and PCV system require vigilance. Early detection of coolant loss, fuel dilution, or rough idle can save the engine. Every rebuilt engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty, with upgraded components addressing the original failure points. Compare quotes from UK specialists today.
Compare rebuilt B48B20 BMW X3 G01 30i engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW X3 G01 30i. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW X3 G01 30i Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW X3 G01 30i engine replacement cost-
A BMW X3 G01 30i engine replacement typically costs £1,500-£4,500 depending on the condition type and engine code. Used engines start from around £1,500, reconditioned units from £1,800, and rebuilt engines with a 12-month warranty from £1,800. Labour for fitting adds approximately £500-£1,000 for an independent specialist.
- Used: £1,500-£2,800
- Reconditioned: £1,800-£3,800
- Rebuilt: £1,800-£3,800
- Fitting labour: 8-12 hours at £65/hr
Question 2Is the BMW X3 G01 30i B48 engine reliable-
Yes, the B48B20 is generally reliable and capable of 150,000+ miles with proper maintenance. However, coolant system issues, injector seal leaks, and PCV system failure are common at higher mileages. Regular servicing with BMW Longlife-14 approved oil is essential.
- B48B20: 150,000+ miles with maintenance
- Coolant system issues are the most common problem
- Injector seal leaks can cause oil dilution
- Regular oil changes with correct spec oil are essential
Question 3Is it worth replacing the engine on a BMW X3 G01 30i-
Yes, replacing the engine on a BMW X3 G01 30i is usually worthwhile given strong residual values (£15,000-£35,000). A rebuilt engine with warranty typically costs £1,800-£3,800 versus the cost of a comparable replacement vehicle, making repair the economically sensible choice for most owners.
- BMW X3 G01 30i retains strong resale value
- Rebuilt engine with warranty costs significantly less than vehicle replacement
- Supply and fit service minimises downtime
- Engine replacement extends vehicle life by 80,000+ miles
Question 4How long does a BMW X3 G01 30i engine replacement take-
A typical BMW X3 G01 30i engine replacement takes 2-4 working days for a full rebuild, including parts sourcing, fitting, and testing. Supply-only engines can often be dispatched within 1-3 working days, with fitting then scheduled at your chosen specialist.
- Full rebuild with fitting: 2-4 working days
- Supply only: 1-3 working days
- Fitting labour: 8-12 hours at specialist rates
- Confirm exact timeline with your chosen supplier at booking
Question 5What's the difference between the BMW X3 G01 30i and 20i-
The 30i produces 252hp from its 2.0-litre turbo petrol, while the 20i produces 184hp from the same 2.0-litre displacement. Both share the same B48 engine architecture, but the 30i uses a higher state of tune with a different turbocharger and engine management calibration.
- 30i: 252hp, higher-output petrol option
- 20i: 184hp, entry-level petrol option
- Both share the same 2.0-litre four-cylinder petrol architecture
- Engine codes differ between the two variants
Question 6What engine code is in my BMW X3 G01 30i-
Your BMW X3 G01 30i will have one of three engine codes depending on its production year: B48B20 (2017-2024), B48B20A (2017-2020), or B48B20B (2020-2024). Enter your registration above to confirm the exact code fitted to your vehicle.
- 2017-2024: B48B20 (252hp)
- 2017-2020: B48B20A (252hp)
- 2020-2024: B48B20B (252hp)
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