BMW X1 E84SUV2009–2015
Every engine fitted to the X1 E84 — from the N46 naturally-aspirated four and the N47 diesel to the N20 turbocharged four, the N52 straight-six, and the N55 turbo-six that topped the range.
Real UK replacement costs and honest reliability data for BMW's first-generation compact SUV.
Backed by 120+ real UK enquiries in 2025 [BMW-VERIFIED].
Engine Database
Every engine fitted to the X1 E84 specifically — including the naturally-aspirated and turbocharged four-cylinders, the straight-six petrols, and the full range of diesel options.
Overview
The E84 is the first generation of the BMW X1, produced from October 2009 to June 2015. Built on the E90 3 Series platform, it brought rear-wheel-drive dynamics to the compact SUV segment and was the first X model available with sDrive (rear-wheel drive). The engine line-up evolved significantly during production: early cars offered the N46 naturally-aspirated four, the N52 straight-six, and the N47 diesel four.
A 2012 facelift introduced the N20 turbocharged four-cylinder and the N55 turbo-six, while the N47 received updates. The E84 was replaced by the front-wheel-drive F48 X1 in 2015.
Key Facts
Market Intelligence
The X1 E84 generated 120 real UK engine enquiries in 2025 [BMW-VERIFIED], with the N47 diesel variants accounting for the majority of demand based on market patterns.
04Best & Worst Engines
Best Value
N20B20 (sDrive20i/xDrive20i)
“The 2.0-litre turbocharged four delivers 184 bhp — enough for everyday driving with excellent fuel economy. It replaced the N52 in the xDrive28i with 245 bhp in later years. It's the sensible choice that still feels quick, and it's cheaper to run than the six-cylinders.”
Who it's for: buyers who want modern turbo performance with sensible running costs.
Highest Risk
N47D20C (early 18d/20d, 2009–2011)
“The N47's rear-mounted timing chain is the E84's defining risk — cold-start rattle is the warning, and a snapped chain means full replacement. Early cars (2009–2011) are the highest risk. BMW revised the chain design in later years, but the issue was never fully eliminated.”
Who it's for: only buyers with documented chain-replacement history or post-2012 cars.
Most Expensive Failure
N55B30 (xDrive35i)
“The 3.0-litre turbo straight-six delivers 306 bhp of effortless performance, but it's complex and costly to maintain. High-pressure fuel pump failures, VANOS issues, and oil leaks are well-documented. A full engine replacement can exceed £7,000.”
Who it's for: buyers who want the most powerful E84 and are prepared for the running costs.
Most Overlooked
N20B16A (sDrive16i)
“The 1.6-litre turbo four is often overlooked — it was introduced late in the E84's life (2013) primarily for tax-sensitive markets. With 143 bhp, it's the entry-level petrol, but it's a surprisingly capable and economical engine for urban use.”
Who it's for: buyers who want a petrol E84 with the lowest possible running costs.
Best Value
N20B20
(sDrive20i/xDrive20i)
“The 2.0-litre turbocharged four delivers 184 bhp — enough for everyday driving with excellent fuel economy. It replaced the N52 in the xDrive28i with 245 bhp in later years. It's the sensible choice that still feels quick, and it's cheaper to run than the six-cylinders.”
Who it's for: buyers who want modern turbo performance with sensible running costs.
Highest Risk
N47D20C
(early 18d/20d, 2009–2011)
“The N47's rear-mounted timing chain is the E84's defining risk — cold-start rattle is the warning, and a snapped chain means full replacement. Early cars (2009–2011) are the highest risk. BMW revised the chain design in later years, but the issue was never fully eliminated.”
Who it's for: only buyers with documented chain-replacement history or post-2012 cars.
Most Expensive Failure
N55B30
(xDrive35i)
“The 3.0-litre turbo straight-six delivers 306 bhp of effortless performance, but it's complex and costly to maintain. High-pressure fuel pump failures, VANOS issues, and oil leaks are well-documented. A full engine replacement can exceed £7,000.”
Who it's for: buyers who want the most powerful E84 and are prepared for the running costs.
Most Overlooked
N20B16A (sDrive16i)
“The 1.6-litre turbo four is often overlooked — it was introduced late in the E84's life (2013) primarily for tax-sensitive markets. With 143 bhp, it's the entry-level petrol, but it's a surprisingly capable and economical engine for urban use.”
Who it's for: buyers who want a petrol E84 with the lowest possible running costs.
Engine
Typical Mileage
Common Major Failure
Repair Cost (Specialist)
Replacement Cost (Recon)
Ownership Verdict
Solid Four -simple and reliableLate Entry -budget for chain work
Best Petrol -modern and efficientMost Refined -the one to buyHigh Power, High Cost -budget for maintenancePre-2012 Risk -chain history essentialBest Diesel -twin-turbo, more powerEconomy Diesel -improved but still a riskEngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership VerdictSolid Four -simple and reliableLate Entry -budget for chain workBest Petrol -modern and efficientMost Refined -the one to buyHigh Power, High Cost -budget for maintenancePre-2012 Risk -chain history essentialBest Diesel -twin-turbo, more powerEconomy Diesel -improved but still a risk
The E84 rule
A £3,200–£5,500 N47 recon against a £4,000–£10,000 X1 sits at 32–138% of the car's value -on a sub‑£5,000 example, that brushes our 70% BMW scrap threshold. Against a well‑kept £7,000+ example, the same recon drops to 46–79% -borderline but often viable for a cherished car. For an N52 xDrive28i at £5,000–£8,000, a £3,000–£5,500 recon is 38–110% -a serious decision. Value the car first; if it's a pre‑2012 N47 without chain history, walk away or budget for the work immediately.
Key Takeaways
Which E84 Costs Least To Own?
N46B20 (sDrive18i) -simple naturally-aspirated four, no turbo, no high-pressure fuel pump.
Which E84 Costs Most To Own?
N55B30 (xDrive35i) -complex turbo six, HPFP and VANOS issues, expensive parts.
Which E84 Is Best Value?
N52B30 (xDrive28i) -258 bhp straight-six, proven reliability, and often cheaper than the turbocharged alternatives.
N47
Timing Chain Stretch (Diesel Engines)
Affected models:
Typical failure mileage:
Root cause:
Our Recommendation
At the first sign of cold-start rattle, get the chain inspected immediately -a £650–£1,800 preventative repair is dramatically cheaper than the £3,200+ replacement that follows if ignored. On an E84 worth under £5,000, this decision alone determines whether the car stays economically viable.
N20
Timing Chain Guide Wear (Petrol Four-Cylinders)
Affected models:
Typical failure mileage:
Root cause:
Our Recommendation
If you're buying an N20-powered E84, look for documented timing chain work or budget £1,200–£2,500 immediately -especially on pre-2013 cars. A preventative chain and tensioner replacement is dramatically cheaper than the £2,500+ replacement that follows a failure.
N55
HPFP & VANOS Failure (xDrive35i)
Affected models:
Typical failure mileage:
Root cause:
Our Recommendation
If your xDrive35i develops long cranking or rough running, have the HPFP inspected immediately -a £800–£1,800 repair is cheaper than the £4,500+ replacement that follows a catastrophic failure.
N52
Cooling System & Valve Lift (xDrive28i)
Affected models:
Typical failure mileage:
Root cause:
Our Recommendation
If you're buying an N52-powered E84, budget for a cooling system refresh at 80,000 miles -£500–£1,200 is cheap insurance against a £3,000+ replacement.
VariantEngine Code
Used (Supply)
Reconditioned (Supply)
Rebuilt (Supply)
Labour HoursScope note: All variants listed are E84 only. sDrive denotes rear-wheel drive; xDrive denotes all-wheel drive. The xDrive28i used the N52B30 straight-six from 2009–2011 and the N20B20 turbo four from 2011–2015. The xDrive35i with the N55B30 turbo six was introduced in 2012.
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,000–£5,500 (reconditioned, supply only)
[BMW-QUOTE]
Most Common Failures
Live FeedBMW X1 xDrive20d E84
N47
Manchester
Cold-start rattle, timing chain inspection3
enquiries
Updated MonthlyBMW X1 sDrive20i E84
N20
BirminghamTiming chain rattle on start-up2
enquiries
Updated MonthlyBMW X1 xDrive35i E84
N55
LondonHPFP failure, long cranking2
enquiries
Updated MonthlyMost Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,000–£5,500 (reconditioned, supply only)
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,000–£5,500 (reconditioned, supply only)
[BMW-QUOTE]
Most Common Failures
Scope note: All variants listed are E84 only. sDrive denotes rear-wheel drive; xDrive denotes all-wheel drive. The xDrive28i used the N52B30 straight-six from 2009–2011 and the N20B20 turbo four from 2011–2015. The xDrive35i with the N55B30 turbo six was introduced in 2012.
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,000–£5,500 (reconditioned, supply only)
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,000–£5,500 (reconditioned, supply only)
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£3,000–£5,500 (reconditioned, supply only)
[BMW-QUOTE]
Most Common Failures
Live FeedBMW X1 xDrive20d E84
N47
ManchesterCold-start rattle, timing chain inspection3
enquiries
BMW X1 sDrive20i E84
N20
BirminghamTiming chain rattle on start-up2
enquiries
BMW X1 xDrive35i E84
N55
LondonHPFP failure, long cranking2
enquiries
Updated MonthlyTrusted E84 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real E84 owners, as part of the Engine Finders network.
Compare E84 Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit.
UK Engine Replacement Services for E84
covering every variant from sDrive16d to xDrive35i, with supply‑only or full supply & fit available nationwide.
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