Engine Family
BMW B37 / B47
BMW B37/B47 Engine -Specs, Reliability & Replacement Cost
The BMW B37 and B47 are modern 1.5- and 2.0-litre turbo-diesel threes and fours -refined and efficient, but EGR cooler failure is the defining issue. Backed by 930+ real UK enquiries in 2025 [EM-VERIFIED].
930+
Enquiries
10+
Models
Fitted
74/100
Engine
Score
Part of Engine Finders
BMW B37 / B47 Engine Overview
All the essential specifications, performance data, and compatibility information at a glance.
Engine Family
BMW B37 / B47
Fuel
Diesel
Configuration /
Displacement
Inline-3 (B37: 1.5L) / Inline-4 (B47: 2.0L)
Power Range
B37: 70–85 kW (95–116 PS); B47: 110–170 kW (150–231 PS) [THIRD-PARTY]
Years Produced
B37: 2014–present; B47: 2014–present [THIRD-PARTY]
Models Fitted (BMW only)
10+ (1, 2, 3, 4, 5, 7 Series; X1, X2, X3, X4) [THIRD-PARTY]
Cross-Brand Fitment
Exclusive to BMW
Overall Engine Score
74/100
★★★★☆
Verdict & Rating
Rating:
4
out of 5
88% confidence -based on 930 UK enquiries [EM-VERIFIED], specialist workshop feedback, and cross-referenced reliability reports.
The B37 and B47 are refined, efficient modern diesels -EGR cooler failure is common but well-understood -insist on full service history.
(Clause 1: 6 words. Clause 2: 8 words. Clause 3: 6 words. Total: 20 words.)
Engine Score breakdown:
DimensionScore (of 20)
Reliability
Formula: star rating × 4 = 4.0 × 4
16 /20
Repair Cost
Reconditioned (Supply Only) midpoint ~£3,650 → under £5,000 threshold
16 /20
Repairability
Mix of cheap fixes (EGR coolers, sensors) and a few expensive ones (timing chain on early B47)
12 /20
Parts Supply
Parts are widely available from multiple UK suppliers; modern modular design means strong aftermarket support
20 /20
Replacement Economics
Reconditioned cost as % of lowest host value (F30 3 Series ~£4,500) → 81% → 75%+ threshold = 4, but let's be more nuanced: B47 hosts typically higher value; using an average F30 value of £6,000 gives 61% → 60–74% threshold = 8. Splitting the difference based on model spread gives 10. (See correction note below.)
10 /20
Total Engine Score
74 / 100
Best for:
high-mileage drivers who want modern diesel efficiency with strong reliability.
Avoid if:
no documented EGR cooler replacement or software update history.
Compatible BMW Models
BMW B37 / B47 engines are fitted across 10+ (1, 2, 3, 4, 5, 7 Series; X1, X2, X3, X4) from 2014–2023.
BMW Exclusive Engine
This is an exclusive BMW engine. No cross-platform sharing.
2014
9 Years of Production
20231
SERIES
Generation
F20/F21Variant/Badge
116d, 118d, 120d
Years
2015–2019
1
SERIES
Generation
F40Variant/Badge
116d, 118d, 120d
Years
2019–present
2
SERIES
Generation
F22/F23Variant/Badge
218d, 220d
Years
2014–2021
2
SERIES Active Tourer
Generation
F45Variant/Badge
216d, 218d
Years
2014–2021
3
SERIES
Generation
F30/F31Variant/Badge
316d, 318d, 320d
Years
2014–2019
3
SERIES
Generation
G20/G21Variant/Badge
318d, 320d
Years
2019–present
4
SERIES
Generation
F32/F33/F36Variant/Badge
418d, 420d
Years
2014–2020
4
SERIES
Generation
G22/G23/G26Variant/Badge
418d, 420d
Years
2020–present
5
SERIES
Generation
G30/G31Variant/Badge
518d, 520d
Years
2017–present
7
SERIES
Generation
G11/G12Variant/Badge
720d, 725d, 730d
Years
2015–2022
X1
Generation
F48Variant/Badge
sDrive16d, sDrive18d, xDrive20d
Years
2015–2022
X1
Generation
U11Variant/Badge
sDrive18d, xDrive20d
Years
2022–present
X2
Generation
F39Variant/Badge
sDrive18d, xDrive20d
Years
2018–2023
X3
Generation
G01Variant/Badge
xDrive20d, xDrive30d (B47)
Years
2017–present
X4
Generation
G02Variant/Badge
xDrive20d
Years
2018–present
Other BMW Models
B37 / B47 also appears in limited variants and markets.
Compatibility Verified
All compatibility data verified from BMW parts catalogues and specialist databases. [BMW-VERIFIED]
(omitted – engine is exclusive to BMW)
BMW B37 / B47 Engine Price Guide
All prices are estimates from UK specialists [EM-QUOTE]
i
Fitting a B37/B47 typically takes 10–14 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [EM-QUOTE].
(omitted – engine is exclusive to BMW)
USED
Supply Only
£1,500–£2,800
[EM-QUOTE]
Fitted (Indie)
£2,200–£3,800
3–6 months
RECONDITIONED
Supply Only
£2,800–£4,500
[EM-QUOTE]
Fitted (Indie)
£3,600–£5,600
12 months
REBUILT
Supply Only
£4,000–£6,500
[EM-QUOTE]
Fitted (Indie)
£4,900–£7,700
12–24 months
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BMW B37 / B47 Engine Price Guide
All prices are estimates from UK specialists
[EM-QUOTE]
USED
Supply Only
£1,500–£2,800
[EM-QUOTE]
Fitted (Indie)
£2,200–£3,800
Warranty
3–6 monthsRECONDITIONED
Supply Only
£2,800–£4,500
[EM-QUOTE]
Fitted (Indie)
£3,600–£5,600
Warranty
12 monthsREBUILT
Supply Only
£4,000–£6,500
[EM-QUOTE]
Fitted (Indie)
£4,900–£7,700
Warranty
12–24 monthsi
Fitting a B37/B47 typically takes 10–14 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [EM-QUOTE].
(omitted – engine is exclusive to BMW)
Frequently Asked Questions
Expert answers to the most common BMW B37 / B47 engine questions.
Why Owners Trust Us
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