BMW 120i xDrive Engine Replacement - Rebuilt & Reconditioned Units from £2,295
Compare BMW 120i xDrive replacement engine prices from trusted UK suppliers. Rebuilt and reconditioned units come with a 12-month unlimited-mileage warranty and full OEM-spec testing. Save up to 60% versus a main dealer quote.
Enter Your Vehicle Registration To
Find Best Supplier Near You
Search your Engine Manually
BMW 1 Series 120i xDrive Specialists
Expert Solutions for Every 1 Series 120i xDrive - 114i to M135i
Need a reliable replacement engine for your BMW 1 Series 120i xDrive?
Engine Finders specializes in 1 Series engines with solutions for N47/B48 failure patterns across all variants.
- ✔ Full 1 Series 120i xDrive Engine Range - N47/B47 diesels & B38/B48 petrol across all generations
- ✔ Series-Wide Calibration - Correct ECU mapping for every 1 Series chassis (E8x/F2x/F40)
- ✔ 1 Series 120i xDrive Pricing Advantage - Save up to £2,000 vs dealer on common B48 HPFP repairs
BMW 1 Series 120i xDrive Replacement Engines Options - Verified Units (UK Supply)
All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for F40, F41.
Includes updated B48TU crankcase ventilation to prevent oil sludge buildup.
Complete disassembly with upgraded high-pressure fuel pump drive gear.
Cylinder head refaced to correct B48TU valve seat recession issues.
Plug-and-play B48A20A units with matching ECU coding for 2020 - 2025 F40/F41.
Includes reinforced timing chain tensioner and updated rail assembly.
Verified low-mileage units with full service history (≤60,000 miles).
BMW 1 Series 120i xDrive Compatible Engine Codes & Average Prices on Rebuilt Units
All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.
Why Choose Engine Finders for Your BMW 1 Series 120i xDrive Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 1 Series 120i xDrive replacement engines. From N47 and B47 diesel engines to B38 and B48 petrol units found across the 1 Series range (E8x/F2x, 2004 - 2019), we understand the shared engineering - and failure modes - that span chassis generations. Whether you're battling N47 timing chain failures across early 1 Series diesels or B48 high-pressure fuel pump issues in later petrol variants, Engine Finders makes it easy to locate the right engine, fast.
-
✔ 1 Series-Wide N47 Timing Chain Resolution
We upgrade tensioner and guide rails across all E8x/F2x 1 Series variants - critical for 114d/116d/118d/120d models suffering premature wear before 90k miles due to shared N47 chain tensioner design flaws.
-
✔ B47 Low-Pressure EGR System Overhaul
All 114d - 120d B47 variants (2015 - 2019 F20/F21) share EGR cooler and valve (OEM 13518618372) designs prone to carbon seizure and coolant leakage; our rebuilds include upgraded internals and recalibrated software to prevent recurrence.
-
✔ B48 High-Pressure Fuel Pump (HPFP) Reliability Fix
From 118i to M135i, the B48 petrol engine uses identical HPFP, which fails after ~80k miles due to shared cam follower wear; our reconditioned units include reinforced followers (OEM 13518619431) and updated camshafts per BMW Recall 22V-712.
-
✔ N13/B48 Turbo Wastegate Actuator Sticking Prevention
116i - 125i (N13, 2011 - 2015) and later B48 models share wastegate actuator (OEM 13718612945) susceptibility to carbon jamming; we replace with updated BMW-spec units and recalibrate boost control to avoid limp mode across all xDrive/petrol variants.
-
✔ Integrated Starter-Generator (ISG) Failure Mitigation (Mild-Hybrid B48)
2020+ facelift 118i/120i xDrive with 48V mild-hybrid B48 engines share ISG belt tensioner (OEM 12308641521) and pulley wear patterns; our reconditioned engines include upgraded tensioners and belt kits to prevent sudden belt slip and crank sensor fault cascades.
-
✔ Oil Consumption Control for Early B38/B48 Engines
All pre-2018 B38 (116i) and B48 (118i - 125i) engines suffer from shared piston ring land design flaws (OEM ring set 11128612942); our rebuilds use revised BMW Group-approved ring packs and honing protocols to reduce oil burn below 0.5L/1,000 miles.
-
✔ xDrive Transfer Case & Engine Mount Synergy
1 Series xDrive variants (120i xDrive, 125i xDrive, M135i xDrive) share reinforced rear engine mounts (OEM 11128641039) and transfer case input shaft alignment specs; we test all xDrive engines under load to ensure zero driveline vibration post-installation.
-
✔ Chassis-Specific Engine Calibration Matching
We ensure ECU compatibility across E8x (2004 - 2011) and F2x (2011 - 2019) generations - matching DME software (e.g., MSV80/MSV90 for N47/B47) and drive-by-wire calibration (OEM throttle 13628611245) to avoid limp mode, even when swapping between model years.
Rated 4.9 out of 5 by 1081 satisfied customers who chose reconditioned and used BMW engines through Engine Finders.
Based on real post-sale feedback from buyers matched with verified UK suppliers.
BMW 1 Series 120i xDrive Engines for Sale | Engine Finders
Engine Finders connects UK drivers with specialists for reliable, reconditioned BMW 1 Series 120i xDrive replacement engines. Whether battling N47 timing chain failures across early E8x diesels or B48 high-pressure fuel pump issues in F2x petrol variants, we provide direct OEM-spec solutions.
BMW 1 Series 120i xDrive Replacement Engines
The BMW 1 Series evolved through three critical generations: E8x (2004 - 2011) with N47/N52 engines, F2x (2011 - 2019) introducing B38/B48 families, and F40 (2019 - present). The F40 generation adopted modular B38/B48 engines with revised cooling but inherited EGR vulnerabilities from predecessors, affecting all 120i xDrive variants uniformly.
BMW 1 Series 120i xDrive Models & Engines Codes
Engine families are consistent across 1 Series generations, with shared components and failure patterns:
- N47D20: 2.0L diesel (E8x/F2x, 2004 - 2019) - Timing chain tensioner failure across all variants
- B47D20: 2.0L diesel (F2x/F40, 2015 - present) - EGR cooler cracking identically in 114d - 120d
- B48B20: 2.0L petrol (F2x/F40, 2015 - present) - HPFP failure in all 118i - 120i - M135i petrol variants
- B38A15: 1.5L petrol (F40, 2019 - present) - Turbo wastegate issues affecting 116i/118i/120i models uniformly
All N47 engines are compatible across E81/E82/E87/E88 and F20/F21 chassis, while B48 units fit F20/F21/F40 with identical mounting and ancillary layouts.
Buy Used and Second-Hand BMW 1 Series 120i xDrive Engines
For 1 Series owners, used engines carry high risk due to shared N47/B47 failure patterns. Reconditioned units with updated tensioners are essential for pre-2019 diesels. Remanufactured B48 engines with HPFP upgrades are recommended for F2x/F40 petrol variants regardless of trim level.
- Used engines: Not recommended without full service history
- Reconditioned: Standard rebuilds with updated critical components
- Remanufactured: Full OEM-spec restoration with dyno validation
All engine types undergo rigorous inspection to ensure compatibility across the entire 1 Series 120i xDrive range.
BMW 1 Series 120i xDrive Engines in Stock
Our reconditioned 1 Series engines include: New timing components (N47/B47), upgraded HPFPs (B48), EGR coolers, and cylinder head refurbishment. All units undergo 4-hour dyno tests simulating real-world loads across 114i - 120d - M135i power bands, with compression checks meeting BMW ISTA standards for the entire series.
- New timing chains & rails
- Updated HPFPs with revised cam follower
- Refurbished cylinder heads with new valve guides
- Full oil circuit flush and bearing replacement
Every engine is tested under load profiles that replicate the full power range of the 1 Series 120i xDrive family to guarantee reliability.
Warranty for Replacement BMW 1 Series 120i xDrive Engines
12-month warranty on all rebuilt engines. Exclusions apply based on known series-wide design limitations.
- Covers labour and parts for mechanical failure
- Requires professional installation and oil service records
- N47/B47 timing chains excluded due to inherent design flaw
- B48 HPFP excluded in units with over 90,000 miles
Engine Finders is a price comparison website - warranty terms are set by our vetted UK suppliers. Final coverage varies by engine family and mileage.
Expert Tips for Choosing the Right Engine for Your BMW 1 Series 120i xDrive
♻️ BMW 1 Series 120i xDrive Engine Types Explained
- B48A20A (2019 - 2024 F40 120i xDrive) - 2.0L turbo petrol, 184hp
- N20B20O0 (2015 - 2019 F20 120i xDrive) - earlier 2.0L with known timing chain wear
- Reconditioned B48 engines recommended for HPFP failure history in 2016 - 2018 F20s
- Used engines only viable if OEM chain tensioner (11317580994) replaced pre-failure
£ BMW 1 Series 120i xDrive Replacement Engine Cost in the UK
- Used B48A20A (F40): £1,800 - £2,400 (mileage & service history dependent)
- Reconditioned N20B20O0 (F20): £2,900 - £3,400 with updated timing kit (OEM 11317580994)
- Longblock only (B48A20A): £2,100 - £2,600 - ideal if ancillaries intact
- Engine Finders clients save avg. £320 vs main dealers on full-drop replacements
🔍 Finding the Right BMW 1 Series 120i xDrive Engine
- Check VIN: engines ending in *120i* must match F20 (2015 - 2019) or F40 (2019 - 2024)
- N20B20O0 only fits pre-LCI F20 - verify via engine code stamp on block near oil filter
- Don’t fit B48A20O0 (non-xDrive 120i) - xDrive requires specific oil pump & AWD coding
- ECU part numbers 12158592974/12158592975 must match vehicle’s xDrive transmission variant
⛽ BMW 1 Series 120i xDrive Petrol vs Diesel Engines
- 120i xDrive is petrol-only - no diesel variant exists (common buyer misconception!)
- B48A20A (2019+) avoids N20’s timing chain issues but prone to HPFP at 65k+ miles
- ULEZ-compliant: all 120i xDrive (Euro 6d-TEMP) from Sept 2018 onwards
- Best for urban use: B48’s lighter weight improves turn-in vs diesel 118d/120d xDrive
🔒 Quality Assurance & Warranty
- All reconds include timing chain kit (11317580994 + guides 11317583065/11317583066)
- HPFP upgraded to latest revision (13518593712) on N20/B48 engines
- 12-month unlimited-mileage warranty covers oil consumption >0.5L/1,000 miles
- Every engine dyno-tested to BMW spec: 184hp @ 5,000rpm, 290Nm @ 1,350rpm
🛒 Compare & Save on BMW 1 Series 120i xDrive Engines
- Request engine photos showing *xDrive-specific* oil pump casting (code 114105)
- Avoid ‘cheap’ N20s without SIB 11-05-17 compliance (updated chain tensioner mod)
- Opt for longblock if turbo (13028592975) and HPFP (13518593712) still functional
- Engine Finders pre-vets suppliers - only 3 UK workshops certified for B48 rebuilds
⚙️ BMW 1 Series 120i xDrive Engine Works: How Experts Rebuild Engines
When your engine fails, BMW 1 Series 120i xDrive engine works can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results.
1. Diagnostics & Disassembly: Using ISTA+ to extract fault memory (e.g. 29F1 HPFP implausibility), then stripping F20/F40 engines on BMW-specific stands - critical for preserving xDrive oil pump alignment (114105 casting).
2. Block Inspection & Machining: Bore gauge check for N20 cylinder wear (max 0.05mm tolerance); B48 blocks get crack-tested at head bolt threads (torque spec 25Nm+90° for M12 bolts). Re-decking done only if warpage >0.03mm.
3. Timing System Overhaul: Mandatory replacement of tensioner (11317580994), rails (11317583065/66), and chain (11317583282) per SIB 11-05-17 - even on low-mileage B48s due to plastic guide degradation in UK humidity.
4. Fuel & Lubrication Systems: HPFP upgraded to latest gen (13518593712) with new feed lines; oil pump gears inspected for scoring - xDrive variants use 12% higher flow rate (114105 vs 114104 non-xDrive).
5. Reassembly with BMW TIS Specs: Cylinder head torqued in sequence: 20Nm → 90° → 90°; VANOS solenoids (13518592975) cleaned ultrasonically; cam timing verified with BMW tool 11 4 340.
6. Post-Rebuild Validation: 45-minute hot idle test checking oil pressure (min 1.8 bar @ 80°C), then road-load dyno run to confirm 184hp/290Nm and no misfires under load (ISTA+ live data monitoring).