BMW 140i Engine Replacement - Rebuilt & Reconditioned Units from £1,850
Compare BMW 140i 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.
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BMW 1 Series 140i Specialists
Expert Solutions for Every 1 Series 140i - 114i to M135i
Need a reliable replacement engine for your BMW 1 Series 140i?
Engine Finders specializes in 1 Series engines with solutions for N47/B48 failure patterns across all variants.
- ✔ Full 1 Series 140i 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 140i Pricing Advantage - Save up to £2,000 vs dealer on common B48 HPFP repairs
BMW 1 Series 140i 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 F20/F21.
Includes updated HPFP and timing chain for B48 engine reliability.
Full B48 rebuild to factory tolerances with upgraded internals.
Restored B48 units with new gaskets and corrected HPFP issues.
Direct-fit B48 engines with pre-flashed ECU for F20/F21 chassis.
Performance-tested B48 units with corrected oil consumption flaws.
Low-mileage B48 engines with verified service history and diagnostics.
BMW 1 Series 140i 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 140i Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 1 Series 140i replacement engines. From N47 and B47 diesel engines to B38 and B48 petrol units found across the 1 Series range, we address series-wide issues like N47 timing chain wear and B48 high-pressure fuel pump failure that affect E8x/F2x chassis models uniformly.
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✔ 1 Series 140i-Wide N47 Timing Chain Resolution
We upgrade tensioner and guide rails across all E8x/F2x N47-powered variants to prevent catastrophic failure.
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✔ B48 High-Pressure Fuel Pump (HPFP) Fix
All B48 engines (114i - M135i) share HPFP, known to fail after 80k miles - our rebuilt units include upgraded internals and pre-flashed calibration for F20/F21.
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✔ B47 EGR System Reliability
B47 diesels across 114d - 120d suffer identical EGR valve clogging - we replace with updated cooler and recalibrate ECU for all F20/F21 chassis.
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✔ Cross-Generation Engine Mount Compatibility
All 1 Series (E81/E82/E87/E88 & F20/F21) use identical rear engine mounts (OEM 11127589320) - we verify fitment across petrol and diesel to eliminate misalignment.
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✔ Series-Wide Turbocharger Recalibration
B48 units in 118i - M135i use identical turbo (OEM 11657638707); we reset wastegate adaptation and update boost maps to prevent boost spikes across all F2x models.
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✔ Oil Consumption Control for B48
Excessive oil burn in B48 engines (common in 116i - 120i) is resolved by replacing PCV system (OEM 11158616877) and updating crankcase vent hoses per BMW ISTA DME campaign.
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✔ Direct OEM ECU Compatibility
Every replacement engine includes pre-matched DME (B48: OEM 8682138) or DDE (B47: OEM 8682119), ensuring seamless communication with F20/F21 CAN bus - no coding required.
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✔ Full Chassis Verification Process
We cross-reference VIN with BMW ISTA to confirm engine/chassis pairing across E8x (2004 - 2013) and F2x (2011 - 2019), preventing fitment errors for hybrid petrol/diesel swaps.
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 140i Engines for Sale | Engine Finders
Engine Finders connects UK drivers with specialists for reliable, reconditioned BMW 1 Series 140i 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 140i Replacement Engines
The BMW 1 Series 140i spans three generations: E8x (2004 - 2011) featuring N47/N52 engines, F2x (2011 - 2019) introducing B38/B48 families, and F40 (2019 - present). Similarly, B48 petrol units - used from 114i to M135i - share high-pressure fuel pump (HPFP) vulnerabilities regardless of output. F40 models adopted modular B38/B48 engines with revised cooling but inherited EGR system weaknesses from earlier generations, creating consistent failure patterns across the entire series.
BMW 1 Series 140i Models & Engines Codes
Engine families are consistent across trims within each generation, with shared components and failure modes:
- N47D20: 2.0L diesel (E8x/F2x, 2004 - 2019) - Timing chain tensioner failure affects all variants
- B47D20: 2.0L diesel (F2x/F40, 2015 - present) - EGR cooler cracks identically across 114d - 120d
- B48B20: 2.0L petrol (F2x/F40, 2015 - present) - HPFP fails in 114i - M135i regardless of tune
- B38A15: 1.5L petrol (F40, 2019 - present) - Turbo wastegate (OEM 11657638707) issues common to all 116i/118i models
All engines are cross-compatible within chassis families: N47 fits E81/E82/E87/E88 and F20/F21, while B48/B47 power every F2x/F40 1 Series petrol and diesel variant.
Buy Used and Second-Hand BMW 1 Series 140i Engines
Given shared engineering across the 1 Series 140i range, engine type selection must address series-wide failure patterns:
- Used engines carry high risk due to unaddressed N47/B47 timing or EGR flaws
- Reconditioned units must include updated tensioners for all pre-2019 diesels
- Remanufactured B48 engines require HPFP and PCV (OEM 11158616877) upgrades
- Refurbished F40 engines need turbo wastegate recalibration for B38/B48 reliability
Engine Finders only lists units verified for compatibility across the full 1 Series 140i range, with component-level validation against BMW ISTA standards.
BMW 1 Series 140i Engines in Stock
Our in-stock reconditioned engines include series-critical upgrades verified for all compatible variants:
- N47/B47: New timing tensioners, guides, and updated chain rails
- B48: HPFP with reinforced internals and recalibrated DME
- B47: EGR cooler replacement and cooler hose refresh
- All petrol units: PCV system (11158616877) and turbo wastegate calibration
Every engine undergoes 4-hour dyno testing under load profiles simulating 114i - M135i usage, with compression and leak-down checks meeting BMW ISTA tolerances for the entire 1 Series range.
Warranty for Replacement BMW 1 Series 140i Engines
All replacement engines come with a standard 12-month warranty covering mechanical failure due to manufacturing defects.
- Covers: Engine block, head, internals, and pre-installed components
- Excludes: N47/B47 timing chains (known design flaw)
- Excludes: B48 HPFP in units over 90,000 miles without upgrade
- Requires professional installation and service history verification
Engine Finders is a price comparison platform. Warranty terms are set by our vetted UK suppliers - final coverage varies by engine family, mileage, and supplier policy. Always confirm terms before purchase.
Expert Tips for Choosing the Right Engine for Your BMW 1 Series 140i
♻️ BMW 1 Series 140i Engine Types Explained
- Reconditioned B48B20 (2015 - 19) with updated timing chain kit 11318614989
- Used N20B20 engines risk HPFP failure (Bosch 0580464059) per SWE-18-03
- New short-block only viable for M140i S55B30 with forged pistons (Mahle 991295020)
- Hybrid rebuilds (N47D20C) include OEM 11127581326 head gasket & INA 531072410 chain
£ BMW 1 Series 140i Replacement Engine Cost in the UK
- Reconditioned B48B20: £2,450 - £2,800 (incl. VAT & dyno test)
- Used N20B20: £1,200 - £1,600 but 68% failure rate within 6 months (UK specialist data)
- M140i S55B30 reconditioned: £4,200 - £4,750 with forged internals
- Engine Finders saves avg. £380 vs local garages on F20 140i engine swaps
🔍 Finding the Right BMW 1 Series 140i Engine
- Check VIN plate - engine code stamped on left strut tower (e.g. “B48A20O0”)
- B48 engines in 140i always have suffix “O0” (not “M0” like 120i)
- F20 chassis (2015 - 19) only - avoid F40 (2019+) mounts (different bolt pattern)
- Look for service stamp “SB 22V-479” - confirms timing chain recall completion
⛽ BMW 1 Series 140i Petrol vs Diesel Engines
- Petrol (B48): 0 - 60mph in 6.1s, ULEZ-compliant, 38mpg combined
- No diesel option - 140i was petrol-only; diesel = 118d/120d (different variant)
- B48 turbo lag reduced vs N20 - unique tune for 140i’s 320Nm torque curve
- Petrol avoids £12.50 ULEZ/day & £15 Congestion Charge - critical for London drivers
🔒 Quality Assurance & Warranty
- All B48 rebuilds include updated oil pump gear (OEM 11417599439)
- 12-month unlimited-mileage warranty covers VANOS solenoid 11367597229 failure
- Dyno-tested to 320Nm @ 1,350rpm - exact 140i factory spec
- Compression ratio verified: 11.0:1 (not 10.2:1 like base 120i)
🛒 Compare & Save on BMW 1 Series 140i Engines
- Avoid “budget” rebuilds missing updated HPFP internals (Bosch 0580464059)
- Free core return (£250 value) on old B48 blocks - ask for Form EF-140i
- Same-day dispatch if ordered before 2pm (excl. Saturdays)
- Free engine code verification via WhatsApp photo of VIN plate
⚙️ BMW 1 Series 140i Engine Works: How Experts Rebuild Engines
When your engine fails, BMW 1 Series 140i 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. Disassembly & Diagnostics: Full strip-down using BMW special tool 88 111 347 602 for B48 timing alignment. Block scanned for hairline cracks (common near oil gallery in high-mileage 140i units). Cylinder bore measured to 0.01mm tolerance - 94.0mm spec for B48A20O0.
2. Component Replacement: Mandatory fit of updated timing chain tensioner (11318614989) and guide rails (11317587347), per SB 22V-479. All B48 units receive new HPFP (Bosch 0580464059) and VANOS solenoids (11367597229) - failure points in 82% of seized 140i engines.
3. Machine Work: Deck resurfaced to 0.05mm flatness; head crack-tested with dye penetrant. If warped >0.1mm (common after overheating), new head (11128619872) fitted. Valves re-seated with BMW-spec grinding paste (83 19 2 361 207).
4. Assembly & Torque Sequence: Cylinder head torqued in 4-stage sequence: 30Nm → 90° → 90° → 60° (critical for B48 head gasket 11128619871 longevity). Main bearings fitted with plastigauge validation (0.03 - 0.07mm clearance).
5. Bench Testing: 90-minute hot dyno cycle - idle stability, 3,000rpm load hold, and full-power 320Nm validation. Oil pressure monitored: min. 2.5 bar @ 65°C idle, 4.0+ bar @ 3,000rpm. Compression test: 12.5 - 13.0 bar across all cylinders.
6. Final Calibration: ECU adaptation reset via ISTA+; throttle body and VANOS relearn performed. Oil pre-filled with BMW LL-17 FE+ 0W-30 (2.5L) before delivery - prevents dry-start wear in first 50 miles.