BMW X1 F48SUV2015–2022
Every engine fitted to the second-generation X1 F48 — from the 1.5-litre B38 three-cylinder to the 2.0-litre B48 four-cylinder, the B47 diesels and the xDrive25e plug-in hybrid.
Real UK costs, honest reliability data, and BMW's first front-wheel-drive X1.
Backed by 154+ real UK F48 enquiries in 2025 [BMW-VERIFIED].
Engine Database
Every engine fitted to the X1 F48 specifically — from the entry-level sDrive18i to the range-topping xDrive25d and xDrive25e plug-in hybrid.
Overview
The second-generation BMW X1 (codenamed F48) was unveiled at the September 2015 Frankfurt Motor Show and entered production in June 2015. Built on BMW's modular front-wheel-drive UKL2 platform, the F48 marked a significant departure from its rear-wheel-drive predecessor, the E84. The engine range launched with 1.5-litre B38 three-cylinder and 2.0-litre B48 four-cylinder petrols, alongside B37 and B47 diesels.
A plug-in hybrid xDrive25e joined the range in 2020. A facelift (LCI) was introduced in 2019. Production ended in June 2022, replaced by the third-generation U11 X1.
Key Facts
Market Intelligence
The X1 F48 generated 154 real UK engine enquiries in 2025 [BMW-VERIFIED], concentrated on the 2.0-litre petrol and diesel variants as the most popular UK choices.
04Best & Worst Engines
Best Petrol Overall
B48A20A/B -20i/25i (2015–2022)
“The B48 2.0-litre is BMW's most refined four-cylinder — smooth, responsive and genuinely reliable. The 20i offers 178–192 PS; the 25i delivers 231 PS. Both are a significant step up from the older N20.”
Who it's for: buyers who want the best all-round F48 petrol.
Best Diesel Overall
B47C20B -20d (2015–2022)
“The B47 is a significant improvement over the N47 — timing chain issues are far less common, and EGR cooler problems are well-documented and manageable. The 20d's 190 PS offers excellent economy without sacrificing performance.”
Who it's for: buyers who want diesel economy with genuine pace.
Highest Risk
B37C15A -16d
“The 1.5-litre three-cylinder diesel is the least powerful engine in the F48 range — 116 PS is marginal for an SUV of this weight. It's also the least common, meaning parts and specialist knowledge are harder to find.”
Who it's for: buyers who prioritise fuel economy above all else.
Most Expensive Failure
B47B20 -25d
“The 25d is the range-topping diesel with 231 PS — twin-turbo complexity adds significant maintenance costs. Injector and turbo repairs are more expensive than on the single-turbo 20d.”
Who it's for: buyers who want diesel performance and are prepared for the bills.
Best Value
B48A20A -20i
“The 20i is the most common F48 petrol — reliable, efficient and well-supported. A £2,800–£4,500 recon makes sense against an £8,000–£22,000 vehicle.”
Who it's for: buyers who want the most cost-effective F48 ownership.
Most Overlooked
B38A15A -18i
“The 1.5-litre three-cylinder is often overlooked by buyers chasing bigger engines — but it's a genuinely charming unit, reliable and surprisingly perky in the F48's lightweight UKL2 chassis. Perfect for urban driving.”
Who it's for: buyers who want low running costs and don't need four-cylinder pace.
Best Petrol Overall
B48A20A/B
-20i/25i (2015–2022)
“The B48 2.0-litre is BMW's most refined four-cylinder — smooth, responsive and genuinely reliable. The 20i offers 178–192 PS; the 25i delivers 231 PS. Both are a significant step up from the older N20.”
Who it's for: buyers who want the best all-round F48 petrol.
Best Diesel Overall
B47C20B
-20d (2015–2022)
“The B47 is a significant improvement over the N47 — timing chain issues are far less common, and EGR cooler problems are well-documented and manageable. The 20d's 190 PS offers excellent economy without sacrificing performance.”
Who it's for: buyers who want diesel economy with genuine pace.
Highest Risk
B37C15A
-16d
“The 1.5-litre three-cylinder diesel is the least powerful engine in the F48 range — 116 PS is marginal for an SUV of this weight. It's also the least common, meaning parts and specialist knowledge are harder to find.”
Who it's for: buyers who prioritise fuel economy above all else.
Most Expensive Failure
B47B20
-25d
“The 25d is the range-topping diesel with 231 PS — twin-turbo complexity adds significant maintenance costs. Injector and turbo repairs are more expensive than on the single-turbo 20d.”
Who it's for: buyers who want diesel performance and are prepared for the bills.
Best Value
B48A20A
-20i
“The 20i is the most common F48 petrol — reliable, efficient and well-supported. A £2,800–£4,500 recon makes sense against an £8,000–£22,000 vehicle.”
Who it's for: buyers who want the most cost-effective F48 ownership.
Most Overlooked
B38A15A -18i
“The 1.5-litre three-cylinder is often overlooked by buyers chasing bigger engines — but it's a genuinely charming unit, reliable and surprisingly perky in the F48's lightweight UKL2 chassis. Perfect for urban driving.”
Who it's for: buyers who want low running costs and don't need four-cylinder pace.
Engine
Typical Mileage
Common Major Failure
Repair Cost (Specialist)
Replacement Cost (Recon)
Ownership Verdict
Solid Choice -reliable three-cylinderBest Petrol -B48 is a modern classicSolid Choice -more power, same reliability
Watch Closely -underpowered, less commonSolid Choice -improved over N47Best Diesel -B47 is a modern classicWatch Closely -twin-turbo complexityFuture Tech -hybrid complexityEngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership VerdictSolid Choice -reliable three-cylinderBest Petrol -B48 is a modern classicSolid Choice -more power, same reliabilityWatch Closely -underpowered, less commonSolid Choice -improved over N47Best Diesel -B47 is a modern classicWatch Closely -twin-turbo complexityFuture Tech -hybrid complexity
The F48 rule
A £2,800–£4,500 B48 recon against an £8,000–£22,000 F48 sits at 13–56% of the car's value -within our 70% BMW threshold. Even against a high-mileage £6,000 example, the same recon is 47–75% -assess carefully. The F48 holds value well enough that engine replacement is almost always viable.
B38/B48
Cooling System
Affected models:
F48 18i, 20i, 25i (all B-series petrol engines, 2015–2022).
Typical failure mileage:
60,000–100,000 miles.
Root cause:
The B-series modular engines are generally reliable, but cooling system components -water pump, expansion tank, plastic fittings -can develop leaks. This is the most common B-series failure point across the range.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£600–£1,200
£400–£900
Catastrophic (Replacement)
Dealer
Specialist
£3,500–£5,500
£2,800–£4,500
Our Recommendation
On any B-series F48 approaching 60,000 miles, have the cooling system inspected -a £400–£900 preventative repair is cheaper than the £2,800+ replacement that follows an overheating failure.
B47
Diesel EGR Cooler
Affected models:
F48 18d, 20d, 25d (B47 diesel, 2015–2022).
Typical failure mileage:
60,000–120,000 miles.
Root cause:
The B47 diesel's EGR cooler can develop internal leaks, allowing coolant into the exhaust. This is a known issue across BMW's B47 engine family. The B47 is otherwise a significant improvement over the N47 -timing chain issues are far less common.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£600–£1,200
£400–£900
Catastrophic (Replacement)
Dealer
Specialist
£4,000–£6,500
£3,200–£5,500
Our Recommendation
At the first sign of coolant loss or white smoke, get the EGR cooler inspected -a £400–£900 repair is cheaper than the £3,200+ replacement that follows if ignored.
xDrive25e
PHEV Battery & Charging System
Affected models:
F48 xDrive25e (PHEV, 2020–2022).
Typical failure mileage:
40,000–80,000 miles.
Root cause:
The xDrive25e adds significant complexity -a lithium-ion battery pack, electric motor and charging system. Battery degradation and charging system faults are the primary concerns. The internal combustion engine (B38) is robust, but the hybrid system requires specialist attention.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£800–£1,500
£500–£1,200
Catastrophic (Replacement)
Dealer
Specialist
£5,000–£8,000
£3,500–£5,500
Our Recommendation
If you're buying an xDrive25e, have a full battery health check and charging system inspection before purchase. Hybrid components can be expensive to replace -factor this into your ownership budget.
VariantEngine Code
Used (Supply)
Reconditioned (Supply)
Rebuilt (Supply)
Labour HoursNo Generation variance from the Engine Page baseline -no dedicated Engine Pages exist for these families yet, so baseline figures are drawn from the EM_Proprietary_Data Table A. Labour hours estimated at 8–12 hours for three-cylinder engines and 10–14 hours for four-cylinder engines. The UKL2 platform's transverse layout affects labour access.
Scope note: All variants listed are X1 F48 only. sDrive denotes front-wheel drive; xDrive denotes all-wheel drive. The xDrive25e plug-in hybrid (2020–2022) combines a 1.5-litre three-cylinder petrol engine with an electric motor for 220 PS system output.
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,800
reconditioned, supply only
[BMW-QUOTE]
Most Common Failures
Live FeedBMW X1 xDrive20d F48
B47
Manchester
White smoke from exhaust5
enquiries
Updated MonthlyBMW X1 xDrive20i F48
B48
BirminghamCoolant loss warning4
enquiries
Updated MonthlyBMW X1 xDrive25e F48
B38 PHEV
LeedsCharging system fault2
enquiries
Updated MonthlyMost Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,800
reconditioned, supply only
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,800
reconditioned, supply only
[BMW-QUOTE]
Most Common Failures
Scope note: All variants listed are X1 F48 only. sDrive denotes front-wheel drive; xDrive denotes all-wheel drive. The xDrive25e plug-in hybrid (2020–2022) combines a 1.5-litre three-cylinder petrol engine with an electric motor for 220 PS system output.
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,800
reconditioned, supply only
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,800
reconditioned, supply only
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,800
reconditioned, supply only
[BMW-QUOTE]
Most Common Failures
Live FeedBMW X1 xDrive20d F48
B47
ManchesterWhite smoke from exhaust5
enquiries
BMW X1 xDrive20i F48
B48
BirminghamCoolant loss warning4
enquiries
BMW X1 xDrive25e F48
B38 PHEV
LeedsCharging system fault2
enquiries
Updated MonthlyTrusted F48 Engine Suppliers
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UK Engine Replacement Services for F48
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