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BMW i Series Engine ReplacementCompare Prices & Save
Get quotes today from trusted UK BMW i Series engine specialists. Compare prices on reconditioned, rebuilt and used engines - supply & fit available nationwide.
i3 REx Range Extender Engines - from £1,850 to £2,950
-> Rebuilt units from £1,850 · Common codes: B38A15R, B38A15R-2, B38A15R-3
i8 Hybrid Petrol Engines - from £2,400 to £4,200
-> Rebuilt units from £2,400 · Common codes: B38A15T0, B38A15T0-2
i Series Pure Electric Drive Units - from £2,150 to £4,800
-> Rebuilt units from £2,150 · Common codes: EM100, EM100-2, EM200, EM200-2, EM200-3
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3 Simple Stepsto Finding the Best BMW i Series Replacement Engine
Get Instant Quotes from BMW Engine Specialists Across the UK - 100% free, no obligation. Most replacements completed within 3-5 days.
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Live UK Engine Market Data
What Are UK Drivers Paying for BMW i Series Engine Replacement?
The table below shows typical UK rebuilt engine costs across BMW i Series variants, covering documented failure causes, chassis codes, engine codes, fuel types and battery sizes based on current market data.
Average Market Prices
- BMW i Series (i01) i3 60Ah2013-2016£2,500-£4,500Motor bearing failureEM100Electric 60Ah
- BMW i Series (i01) i3 94Ah2016-2018£2,800-£4,800Motor bearing noiseEM100-2Electric 94Ah
- BMW i Series (i01) i3 120Ah2018-2022£3,000-£5,500Rotor bearing wearEM200Electric 120Ah
- BMW i Series (i01) i3 REx 60Ah2014-2016£1,850-£2,950Carbon buildupB38A15RPetrol 0.6L
- BMW i Series (i01) i3 REx 94Ah2016-2018£1,900-£3,100Generator bearing failB38A15R-2Petrol 0.6L
- BMW i Series (i01) i3 REx 120Ah2018-2022£2,000-£3,300Injector foulingB38A15R-3Petrol 0.6L
- BMW i Series (i12) i8 Coupe2014-2018£2,400-£4,200Timing chain wearB38A15T0Petrol 1.5L
- BMW i Series (i12) i8 Coupe2018-2020£2,500-£4,500HPFP failureB38A15T0-2Petrol 1.5L
- BMW i Series (i12) i8 Roadster2018-2020£2,600-£4,700High-pressure pumpB38A15T0-2Petrol 1.5L
- BMW i Series (G26) i4 eDrive402021-2025£3,200-£5,800Software calibrationEM200-2Electric 80Ah
- BMW i Series (G26) i4 M502021-2025£3,800-£6,800Dual-motor sync failEM200-3Electric 80Ah
- BMW i Series (i20) iX xDrive402021-2025£3,500-£6,200Thermal managementEM300Electric 71kWh
- BMW i Series (i20) iX xDrive502021-2025£3,600-£6,500Drive unit whineEM300-2Electric 105kWh
- BMW i Series (G08) iX32021-2025£3,200-£5,500Inverter voltageEM200-4Electric 74kWh
Last updated: 22 May, 14:59
Customer Reviews
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Models We Cover
BMW i Series Engine ReplacementAll Variants Covered
From the urban-focused i3 60Ah pure electric to the high-performance i8 Coupe plug-in hybrid, our network of UK BMW i Series engine specialists covers every electrified powertrain. Compare rebuilt, reconditioned and used engine prices with typical UK ranges for a rebuilt drive unit or range extender including a 12-month warranty - supply & fit available nationwide.
Pure Electric Core Range
Specs170hp
Years2013-2016
Rebuilt£2,500-£4,500
Range Extender Hybrid Range
Plug-in Hybrid Performance
Modern Electric Sedan & SUV Range
Variant Directory
All BMW i Series Variants - Engine Replacement Coverage
A full alphabetical listing of every BMW i Series trim covered by our network. All entries link to a dedicated variant page, where prices are further broken down by engine code, model year, and condition type. Click a live link to compare quotes.
Engine Codes
BMW i Series Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the BMW i Series across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Petrol Engines
Extracted from detailed petrol and performance engine families across BMW i Series variants.
Hybrid / Electrified Engines
Extracted from electrified powertrains and hybrid engine families used in BMW i Series variants.
Can't find your engine code?
Can’t find your engine code? Enter your registration number above - we’ll instantly identify the exact unit, its technical specifications, and live replacement prices from UK BMW i Series engine specialists. Every rebuilt engine comes with a minimum 12‑month unlimited mileage warranty.
Common Problems
BMW i Series Engine Problems
What It Costs to Fix & When Replacement Makes Sense
The BMW i Series electrified range - from the pioneering i3 to the hybrid i8 - has distinct failure patterns across its range extender petrol units, plug-in hybrid powertrains, and pure electric drive systems. The B38A15R range extender and B38A15T0 hybrid engine share some conventional engine failure modes, while EM-series drive units face bearing and thermal management issues. Every rebuilt engine or drive unit supplied through EngineMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below, we break down the most common i Series powertrain problems and what it really costs to fix them.
Every rebuilt engine includes a minimum 12-month unlimited mileage warranty.
1. BMW i3 REx Range Extender Carbon Buildup
Why B38A15R Generators Lose Output
Affected Models
BMW i3 REx 60Ah, 94Ah, 120Ah (2014-2022, B38A15R, B38A15R-2, B38A15R-3)
Typical Failure Mileage
30,000-60,000 miles
Root Cause
The 647cc two-cylinder range extender engine runs infrequently and often at low load, causing carbon deposits to accumulate on intake valves and injectors. This restricts airflow, reduces generator output, and can trigger emissions faults.
Repair Options & Estimated Costs (UK ranges)
| Repair Tier | Dealer Price | Specialist Price | What It Involves | Longevity / Suitability |
|---|---|---|---|---|
Minor - Carbon Cleaning Service Minor | £450 - £800 | £250 - £450 | Walnut blasting or chemical cleaning of intake valves and injector servicing | 20,000-30,000 miles; suitable if caught before output loss |
Full Replacement - Rebuilt Range Extender Engine Best Value | £3,500 - £5,500 | £1,850 - £2,950 | Supply and fit of rebuilt B38A15R unit with cleaned intake system and new injectors | 60,000+ miles; only option if severe carbon has caused ring or valve damage |
Our Recommendation
Best next step for bmw i3 rex range extender carbon buildup
If your i3 REx is showing reduced generator output or rough running during range extender operation, book a carbon cleaning service immediately - it costs £250-£450 at a specialist and typically restores full performance. Ignoring carbon buildup can lead to valve damage and full engine replacement, which is four times the cost. On a 2015-2018 i3 REx worth £6,000-£10,000, the preventative cleaning makes clear financial sense.
Don't Let Engine Failure Write Off Your BMW i Series
The i Series - from the pioneering i3 to the hybrid i8 and modern i4/iX range - has proven itself as a reliable electric and hybrid platform. But when range extender carbon, bearing wear, or inverter failure strikes, repair costs can quickly approach the value of an older car. EngineMarket makes it simple to compare prices from trusted UK BMW i Series specialists. Every rebuilt unit comes with upgraded components, 12-month warranty, and nationwide delivery. Compare prices and get back on the road without the main dealer premium.
Compare BMW i Series Engine Replacement Prices Now →BMW i Series Engine Problems
What It Costs to Fix & When Replacement Makes Sense
The BMW i Series electrified range - from the pioneering i3 to the hybrid i8 - has distinct failure patterns across its range extender petrol units, plug-in hybrid powertrains, and pure electric drive systems. The B38A15R range extender and B38A15T0 hybrid engine share some conventional engine failure modes, while EM-series drive units face bearing and thermal management issues. Every rebuilt engine or drive unit supplied through EngineMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below, we break down the most common i Series powertrain problems and what it really costs to fix them.
Affected Models
BMW i3 REx 60Ah, 94Ah, 120Ah (2014-2022, B38A15R, B38A15R-2, B38A15R-3)
Typical Failure Mileage
30,000-60,000 miles
Root Cause
The 647cc two-cylinder range extender engine runs infrequently and often at low load, causing carbon deposits to accumulate on intake valves and injectors. This restricts airflow, reduces generator output, and can trigger emissions faults.
Minor - Carbon Cleaning Service
Dealer
£450 - £800
Specialist
£250 - £450
Walnut blasting or chemical cleaning of intake valves and injector servicing
20,000-30,000 miles; suitable if caught before output loss
Full Replacement - Rebuilt Range Extender Engine
Dealer
£3,500 - £5,500
Specialist
£1,850 - £2,950
Supply and fit of rebuilt B38A15R unit with cleaned intake system and new injectors
60,000+ miles; only option if severe carbon has caused ring or valve damage
Our Recommendation
Best next step for bmw i3 rex range extender carbon buildup
If your i3 REx is showing reduced generator output or rough running during range extender operation, book a carbon cleaning service immediately - it costs £250-£450 at a specialist and typically restores full performance. Ignoring carbon buildup can lead to valve damage and full engine replacement, which is four times the cost. On a 2015-2018 i3 REx worth £6,000-£10,000, the preventative cleaning makes clear financial sense.
Don't Let Engine Failure Write Off Your BMW i Series
The i Series - from the pioneering i3 to the hybrid i8 and modern i4/iX range - has proven itself as a reliable electric and hybrid platform. But when range extender carbon, bearing wear, or inverter failure strikes, repair costs can quickly approach the value of an older car. EngineMarket makes it simple to compare prices from trusted UK BMW i Series specialists. Every rebuilt unit comes with upgraded components, 12-month warranty, and nationwide delivery. Compare prices and get back on the road without the main dealer premium.
Compare BMW i Series Engine Replacement Prices Now →Disclaimer: 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 EngineMarket'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 i Series and engine code. Every engine supplied through EngineMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
12-Month Warranty
Upgraded Components
Nationwide UK Delivery
Save vs Main Dealer Price
Replacement Engine Options
BMW i Series Engine TypesOptions, Costs & What to Expect
Every engine type for your BMW i Series is available through our UK network, with typical price ranges based on your exact variant, engine code and budget.
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific BMW i Series within hours.
Engine Sizes
BMW i Series Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the BMW i Series is listed below, with compatible engine codes, years and common failure notes.
BMW i Series Petrol Engine Sizes
The 647cc two-cylinder petrol engine serves exclusively as a range extender (REx) in the i3, never driving the wheels directly. Derived from the BMW C600 scooter, this lightweight auxiliary power unit generates electricity to charge the battery pack when depleted, adding approximately 40-80 miles of additional range depending on driving conditions . The REx option was introduced in 2014 for the 60Ah i3 and continued through to the 120Ah model until 2022 in European markets .
| Engine Code(s) | B38A15R, B38A15R-2, B38A15R-3 |
| Compatible Models (UK) | i3 REx 60Ah (2014-2016), i3 REx 94Ah (2016-2018), i3 REx 120Ah |
| Production Years | 2018-2022 |
Common Failure Points
Watch for these known weak points
Carbon buildup on intake valves, generator bearing failure (rattling noise), injector fouling from infrequent use
Not sure which engine size your BMW i Series needs? Enter your registration number above - we'll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EngineMarket include a minimum 12-month unlimited mileage warranty from UK BMW i Series specialists.
BMW i Series Engines Fuel Type
BMW i Series Engines by Fuel Type
Choose your BMW i Series engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the early i3 60Ah pure electric to the latest iX M60.
BMW i Series Petrol Engines
BMW i Series Petrol Engines
Petrol engines in the i Series appear exclusively as range extender units in the i3 and as the rear-mounted turbo three-cylinder in the i8 plug-in hybrid - no pure petrol i Series exists.
Common Engine Families
B38A15R - 647cc two-cylinder range extender generator (i3 REx 60Ah to 120Ah)
B38A15T0 - 1.5L turbo three-cylinder hybrid engine (i8 Coupe, 2014-2018)
B38A15T0-2 - updated 1.5L turbo with 374hp combined output (i8 Facelift, i8 Roadster)
Found In
i3 REx (2014-2022) - B38A15R family range extender only
i8 Coupe (2014-2018) - B38A15T0 plug-in hybrid
i8 Coupe Facelift (2018-2020) - B38A15T0-2 plug-in hybrid
i8 Roadster (2018-2020) - B38A15T0-2 plug-in hybrid
Known For
Range extender carbon buildup requiring periodic cleaning every 30k-60k miles
i8 timing chain wear and HPFP failure shared with conventional B38 engines
Generator bearing failure causing rattling noise on i3 REx units
No conventional petrol-only driving - both systems rely on electric motors for propulsion
Typical Models (UK)
i3 REx 60Ah
i3 REx 94Ah
i3 REx 120Ah
i8 Coupe
i8 Roadster
Not sure which fuel type your BMW i Series has? Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK BMW i Series specialists.
Engine Years
BMW i Series Engines by YearWhat Was Fitted & When
This section covers all major powertrain changes across the BMW i Series production timeline from 2013 to the present, organised so owners can quickly identify their engine code and compare rebuilt drive unit or range extender prices from UK specialists.
2013-2016 - i01 (i3 60Ah Pure Electric)
Major Engine Change
The BMW i3 launched BMW's electric sub-brand with the EM100 drive unit and 60Ah battery - a revolutionary carbon-fibre city car that redefined urban mobility.
Key Changes
i3 60Ah pure electric launched (2013)
First mass-production carbon-fibre reinforced plastic (CFRP) passenger cell
Rear-axle mounted EM100 electric motor
BMW eDrive technology debut
Known For
Pioneering electric city car with distinctive design
Lightweight CFRP construction improves efficiency
Early bearing wear issues documented in SI B61 02 17
Rear-hinged "coach doors" for easy access
Main Engines
EM100 - 60Ah electric drive unit (170hp)
Popular Models
BMW i3 60Ah
BMW i3 60Ah Mega World
BMW i3 60Ah Giga World
BMW i3 60Ah Tera World
Engine Codes Covered
EM100
Common Replacement Enquiries
BMW i3 60Ah drive unit replacement
EM100 bearing noise repair
BMW i3 electric motor failure 2014
i3 drive unit cost UK
Get quotes for 2013-2016 BMW i3 60Ah replacement drive units
2013-2016 - i01 (i3 60Ah Pure Electric)
Major Engine Change
The BMW i3 launched BMW's electric sub-brand with the EM100 drive unit and 60Ah battery - a revolutionary carbon-fibre city car that redefined urban mobility.
Key Changes
i3 60Ah pure electric launched (2013)
First mass-production carbon-fibre reinforced plastic (CFRP) passenger cell
Rear-axle mounted EM100 electric motor
BMW eDrive technology debut
Known For
Pioneering electric city car with distinctive design
Lightweight CFRP construction improves efficiency
Early bearing wear issues documented in SI B61 02 17
Rear-hinged "coach doors" for easy access
Main Engines
EM100 - 60Ah electric drive unit (170hp)
Engine Codes Covered
EM100
Popular Models
BMW i3 60Ah
BMW i3 60Ah Mega World
BMW i3 60Ah Giga World
BMW i3 60Ah Tera World
Common Replacement Enquiries
BMW i3 60Ah drive unit replacement
EM100 bearing noise repair
BMW i3 electric motor failure 2014
i3 drive unit cost UK
Get quotes for 2013-2016 BMW i3 60Ah replacement drive units
Year Finder
Not sure which year your BMW i Series was built?
Not sure which year your BMW i Series was built? Enter your registration number and we'll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK BMW i Series specialists.
FAQ
BMW i Series Engine ReplacementFrequently Asked Questions
Question 1
How much does a BMW i3 REx range extender engine replacement cost in the UK?
A replacement BMW i3 REx engine typically costs £1,850-£2,950 supply-only for a rebuilt unit, or £700-£1,400 for specialist generator bearing replacement.
Key points
- • Dealer replacement: £3,500-£5,500 supply & fit (often with long lead times)
- • Specialist rebuilt B38A15R: £1,850-£2,950 supply only
- • Generator bearing replacement (intermediate fix): £700-£1,200 at a specialist
- • Used units from verified donors: £1,200-£2,500 depending on mileage
- • Prices exclude fitting - add £450-£850 for certified installation
Question 2
What causes the BMW i3 REx engine to fail - and how do I stop it?
Carbon buildup from infrequent generator use is the #1 killer of i3 REx engines, followed by generator bearing wear at 40,000-80,000 miles.
Key points
- • Carbon buildup restricts intake valves, reducing generator output
- • Symptoms: rough running when REx activates, loss of charging range
- • Carbon cleaning (walnut blasting) costs £250-£450 at a specialist
- • Generator bearing failure causes rattling noise - replace bearings promptly
- • Regular REx exercise prevents carbon - run it monthly for 20+ minutes
Question 3
Is the BMW i8 B38 hybrid engine reliable? What goes wrong?
The B38A15T0 is generally robust, but timing chain wear (60k-80k miles) and HPFP failure are documented weak points owners should budget for.
Key points
- • Timing chain stretch causes cold-start rattling - replace preventatively
- • High-pressure fuel pump (HPFP) failure leads to rough idle and stalling
- • HPFP replacement at specialist: £700-£1,400
- • Timing chain replacement: £1,200-£2,200 at independent specialist
- • B38 engine won International Engine of the Year 2015
Question 4
Should I replace my BMW i Series engine at a dealer or an independent specialist?
Independent BMW i specialists typically charge 25-50% less than main dealers while delivering equal or better expertise on electrified powertrains.
Key points
- • Dealer rates are 20-30% higher due to overhead and OEM parts markup
- • Independent specialists see i3/i8 daily - faster diagnostics, fewer trial repairs
- • Both preserve manufacturer warranty when using correct parts and procedures
- • Specialists offer flexible parts options (OEM or quality aftermarket)
- • Always verify high-voltage certification for drive unit work
Question 5
Can I still buy a new BMW i3 REx engine from BMW?
New OEM REx units are increasingly difficult to source and carry dealer pricing of £3,500-£5,500 - most owners now choose rebuilt or reconditioned units.
Key points
- • BMW has discontinued new REx engine production for the i3
- • Remaining dealer stock commands premium pricing with long lead times
- • Rebuilt units use upgraded components (bearings, injectors, seals)
- • Reconditioned engines include 12-month warranty as standard
- • Used donor engines from breakers available from £1,200-£2,500
Question 6
What does walnut blasting do for a BMW i3 REx - and is it worth it?
Walnut blasting removes carbon deposits from intake valves - a £250-£450 service that restores generator performance and can prevent full engine replacement.
Key points
- • Carbon buildup is inevitable on direct-injection REx engines from infrequent use
- • Symptoms: reduced range, rough running, check engine lights
- • Walnut blasting is safe - crushed shells remove carbon without damaging metal
- • Benefits: restored power, smoother idle, better fuel efficiency
- • Recommended every 30,000-60,000 miles depending on driving patterns
Question 7
How long does a BMW i Series drive unit last before needing replacement?
Electric drive units typically last 100,000-150,000 miles, but bearing wear can appear from 50,000 miles on early EM100 units.
Key points
- • EM100 series (2013-2016): bearing wear possible from 50k miles
- • EM100-2 (2016-2018): revised bearings, longer lifespan
- • EM200/EM300 (2018+): reinforced rotors, improved durability
Check fitment and engine condition before ordering
whining noise during acceleration, power loss
Question 8
Can I fit a used BMW i3 REx engine from a breaker? What should I check?
Used REx engines are viable from £1,200-£2,500, but always verify generator bearing condition, carbon history, and mileage before purchase.
Key points
- • Request video of engine running before buying
- • Verify bearing health - rattling indicates imminent failure
- • Low-mileage units (under 40k miles) preferred
- • Check service history for regular REx exercise
- • Most suppliers offer 30-90 day warranty on used units
Question 9
Does a replacement BMW i Series engine come with a warranty?
Every engine supplied through EngineMarket includes a minimum 12-month unlimited mileage warranty - reconditioned and rebuilt units typically offer longer coverage.
Key points
- • Rebuilt engines: 12-24 month warranty with upgraded components
- • Reconditioned units: 12 months parts and labour minimum
- • Used engines: 30-90 days depending on supplier
- • Supply & fit packages include labour warranty
- • Always confirm exact terms with your chosen supplier
Question 10
Is it worth replacing the engine in an older BMW i3 REx, or should I sell the car?
With i3 REx values at £6,000-£10,000, a £1,850-£2,950 rebuilt engine makes financial sense - carbon cleaning at £250-£450 is even better value.
Key points
- • 2014-2016 i3 REx values: £5,000-£8,000 depending on condition
- • Rebuilt engine cost: ~25-35% of vehicle value - typically worth doing
- • Preventative carbon cleaning (£250-£450) extends engine life significantly
- • Compare against dealer replacement quotes (£3,500-£5,500)
- • Well-maintained i3 REx remains in strong used demand
Why Choose Us
Why UK BMW i Series Owners Trust EngineMarket
Join thousands of UK drivers who compare BMW i Series engine prices through our network of trusted specialists - every rebuilt and reconditioned unit backed by a minimum 12‑month unlimited mileage warranty and nationwide delivery.
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