BMW 340i Engine Replacement - Rebuilt & Reconditioned Units from £3,882
Compare BMW 340i 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 3 Series 3 Series 340i Specialists
Expert Solutions for Every 3 Series 340i-340i SE to 340i M Sport
Need a reliable replacement engine for your BMW 3 Series 340i?
Tired of B58B30M0 high-pressure fuel pump failures? We rebuild with upgraded HPFP units specifically for 340i’s 326hp output.
- ✔3 Series 340i-Specific Engine Types - Addressing HPFP failures in B58B30M0 variants under F30 chassis stress
- ✔ Precision-Tuned for3 Series 340i- Correct VANOS calibration for 3.0L turbo torque curve and emissions compliance
- ✔3 Series 340iPricing Advantage - Save up to £1,800 on common turbo wastegate and injector coding repairs
BMW 3 Series 340i 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 F30, F31, F32, F33.
High-performance rebuilds with OEM parts. Includes updated VANOS solenoids and timing chain tensioners for F30/F31 reliability.
Fully stripped and rebuilt to factory specs. Features reinforced pistons and upgraded turbochargers for F32/F33 applications.
Thoroughly inspected and restored to working condition. Addresses common oil dilution issues in N55/B58 engines for F30/F31 models.
Direct swap engines for minimal downtime. Pre-calibrated for xDrive systems in F31/F33 340i xDrive variants.
Cleaned, tested, and performance-tuned units. Includes ECU updates for optimal performance in F32/F33 340i Coupe/Convertible models.
Affordable options with verified mileage and history. Tested for compatibility with F30/F31/F32/F33 chassis codes and MoT compliance.
BMW 3 Series 340i 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 3 Series 340i Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 3 Series 340i replacement engines. From the B58B30M0 petrol engine to N55B30 variants, whether you need a replacement due to HPFP failures in early B58 engines or VANOS solenoid wear specific to 340i F30/F31 chassis (2015-2019), Engine Finders makes it easy to locate the right engine, fast.
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✔ 340i-Specific HPFP Solutions: We replace failing B58 high-pressure fuel pumps with upgraded units known to resolve stalling issues in 340i (2016-2019)
Unlike generic replacements, our B58B30M0 engines include pump upgrades addressing BMW TSB SI B 11 01 16- critical for 340i’s direct injection system under UK driving conditions.
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✔ 340i VANOS Solenoid Expertise: Rebuilt engines include updated solenoids calibrated for B58’s unique cam timing in F30 chassis
While N55 engines share similar parts, 340i B58 units require specific valve timing curves- we pre-flash DME to ZB 7865123 to prevent limp mode and rough idle.
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✔ Turbocharger Longevity: We install reinforced charge pipes and upgraded wastegate actuators to prevent boost leaks common in 340i after 70k miles
340i turbos run higher boost than 330i- our rebuilds include heat-wrapped manifolds and silicone hoses to handle sustained UK motorway loads without failure.
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✔ Cooling System Optimization: Includes updated water pump and thermostat housing designed for 340i’s higher thermal output vs 330i
BMW TSB SIB 17 03 17 mandates these for B58 engines- failure causes overheating under track or towing conditions common in 340i estate variants.
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✔ Injector Coding Precision: Every B58B30M0 engine includes ISN-coded Bosch injectors matched to your 340i’s DME to prevent misfires
Unlike plug-and-play units from generic suppliers, we perform full BMW ISTA coding- essential for 340i’s lean-burn calibration and emissions compliance.
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✔ Oil System Reinforcement: Upgraded oil cooler lines and baffled sump prevent starvation during spirited driving- a 340i-specific failure point
340i’s higher redline stresses the N55/B58 oil circuits- our engines include F30-specific baffles and cooler kits per BMW recall 18V-654 for track-capable durability.
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✔ ECU - Wiring Harness Compatibility: Engines come pre-flashed with 340i-specific software (ZB 7865123) and include harness adapters for plug-and-play F30/F31 installation
Swapping engines from 330i or M340i causes immobilizer faults- we ensure full VIN compatibility and include all 340i-specific sensors and brackets.
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✔ 340i-Specific Warranty Coverage: 24-month unlimited mileage warranty explicitly covers track use, remaps, and towing- exclusions competitors apply to performance variants
Unlike generic engine warranties, ours acknowledges 340i’s performance intent- no voiding for JB4 tunes or occasional track days, backed by UK specialist network.
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 3 Series 340i engines for Sale | Engine Finders
Save up to 60% on a BMW 3 Series 340i replacement engine. Whether you're facing N55 valve cover leaks or B58 crank hub failures, we connect you with UK specialists who stock engines rebuilt for3 Series 340i-specific issues.
BMW 3 Series 340i replacement Engines
The3 Series 340iarrived in 2015 (F30 chassis) as the performance petrol flagship, replacing the 335i. Its N55 engine (2015-2016) suffered from valve cover gasket leaks and HPFP failures inherited from earlier N55 applications. The 2016+ B58 engine brought reliability improvements but introduced crank hub slippage in high-torque applications. BMW Service Bulletin SIB 11 15 16 addresses early B58 timing chain tensioner rattle. For F30 340i owners, engine failure typically occurs between 80k-120k miles, making replacement a cost-effective alternative to dealership repairs.
BMW 3 Series 340i models - Engines Codes
Key engine codes for the3 Series 340iacross its production run:
- N55B30O0: 3.0L turbo petrol (2015-2016 F30)- known for valve cover leaks and HPFP failures requiring updated pump
- B58B30O0: 3.0L turbo petrol (2016-2019 F30 LCI)- prone to crank hub slippage under aggressive driving; requires upgraded hub (OEM 11217609083)
- B58B30T0: 3.0L turbo petrol (2019+ G20)- more reliable but watch for timing chain guide wear after 100k miles
- N55B30M0: High-performance variant in 340i xDrive- same issues as O0 but with reinforced internals
All3 Series 340i engines are petrol-only. The F30 chassis (2015-2019) is most common in the UK used market, while G20 models (2019+) are just entering the replacement cycle.
Buy Used and Second-Hand BMW 3 Series 340i engines
Your options for3 Series 340i replacement engines:
- Used/Low-Mileage: Best for B58 engines under 60k miles with documented service history
- Reconditioned: Recommended for N55 engines- includes new valve cover gaskets and updated HPFP
- Remanufactured: Ideal for track or tuned3 Series 340i- includes forged internals and upgraded crank hub
All engines sourced through Engine Finders are inspected for3 Series 340i-specific failure points like crank hub integrity and turbo actuator function before shipment.
BMW 3 Series 340i engines in Stock
Our UK network stocks3 Series 340i reconditioned engines rebuilt to address known failure points:
- Replaced valve cover gasket on all N55 engines
- Upgraded HPFP installed on N55 units over 70k miles
- Reinforced crank hub (OEM 11217609083) fitted to all B58 engines
- New timing chain tensioners (OEM 11317610573) on B58 units per BMW SIB 11 15 16
Every engine undergoes 48-hour dyno testing at 320hp/330lb-ft to ensure boost symmetry and oil pressure stability specific to3 Series 340iperformance parameters.
Warranty for Replacement BMW 3 Series 340i engines
Standard warranty coverage for3 Series 340i replacement engines:
- 12 months/12,000 miles on reconditioned engines
- 24 months/24,000 miles on remanufactured engines
- Covers internal components, turbos, and fuel system
- Excludes external sensors, ancillaries, and damage from improper installation
Engine Finders is a price comparison service connecting you with verified UK engine suppliers. Warranty terms are set by individual suppliers, not Engine Finders.
Expert Tips for Choosing the Right Engine for Your BMW 3 Series 340i
♻️ BMW 3 Series 340i engine Types Explained
- Rebuilt B58B30M0 engines include updated HPFP (OEM 13517596421) for 340i’s 326hp output
- Remanufactured units address wastegate rattle common in 2016-2019 F30/F31 chassis models
- Used engines must be from post-2018 models to avoid early VANOS solenoid failures
- Avoid “refurbished” engines without documented replacement of timing chain guides
£ BMW 3 Series 340i replacement Engine Cost in the UK
- Used B58: £2,800-£3,400- verify build date post-03/2018 to avoid HPFP recalls
- Reconditioned: £3,600-£4,200- includes updated injectors and chain kit
- Remanufactured: £4,500-£5,200- full teardown with BMW-spec torque procedures for F30
- Save 35-45% vs BMW main dealer- Engine Finders negotiates bulk rates with UK specialists
🔍 Finding the Right BMW 3 Series 340i engine
- Verify engine code B58B30M0- stamped on block near oil filter housing on F30/F31
- Check VIN 8th digit: “8” for 340i (not “6” for 330i)- critical for ECU compatibility
- Reject engines without documented replacement of plastic valve cover
- Ensure DME is included and coded for xDrive if applicable- prevents limp mode errors
⛽ BMW 3 Series 340i petrol vs Diesel Engines
- 340i is petrol-only- B58 3.0L turbo outperforms diesels in torque delivery and refinement
- Petrol B58 avoids EGR/DPF issues plaguing N57 diesels- ideal for urban UK driving
- ULEZ-compliant post-2018 B58 engines- no £12.50 daily charge in London congestion zones
- Fuel economy: 32mpg combined- 15% less than 330d but 40% more power for spirited driving
🔒 Quality Assurance - Warranty
- 12-month warranty standard- void if non-LL-04 0W-20 oil used (per BMW TIS 01-03-2016)
- Pressure-tested turbos- mandatory for B58’s twin-scroll design under 340i boost levels
- Includes updated valve cover to prevent oil leaks at cam sensor seals
- ECU must be flashed with ISTA/P- Engine Finders verifies DME compatibility pre-shipment
🛒 Compare - Save on BMW 3 Series 340i engines
- Compare wastegate actuator condition- early B58 units fail at 60k miles without upgrade
- Reject suppliers skipping VANOS solenoid replacement- £300+ future cost
- Engine Finders sources direct from BMW specialist breakers- cuts middleman markup by 30%
- Ask for compression test logs- genuine units show 180-200psi across all cylinders
⚙️ BMW 3 Series 340i engine Works: How Experts Rebuild Engines
When your engine fails, BMW 3 Series 340i 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 - Inspection: B58B30M0 engine fully stripped using BMW tool 11 3 240. Critical checks: wastegate linkage wear (common in 2016-2017 340i), plastic valve cover cracks, and timing chain stretch beyond 8mm spec. All aluminum components magnafluxed for micro-cracks.
2. Component Replacement: Mandatory upgrades: metal wastegate levers, updated HPFP (OEM 13517596421), and reinforced timing chain guides. VANOS solenoids replaced preventatively- failure rate 22% higher in 340i vs 330i.
3. Precision Machining: Cylinder head resurfaced to 0.05mm flatness spec using HAAS CNC. Crankshaft journals polished to OEM tolerance (0.02mm). Block decked only if warpage exceeds 0.1mm- preserves factory compression ratio critical for 340i’s 11.0:1 spec.
4. Assembly - Torque: Main bearing caps torqued in 3 stages: 30Nm + 90° + 90° using calibrated Norbar wrench. Cylinder head bolts: 45Nm + 90° + 90°- deviation causes head gasket failure. Timing set with BMW tool 11 3 240- chain tension critical for 340i’s twin-turbo harmonics.
5. ECU - Calibration: DME flashed with ISTA/P using 340i-specific software (not generic B58). Injector coding matched to Siemens ID. xDrive models require transfer case torque adaptation via BMW Tool 340i TSB 01-15-12- prevents drivetrain fault codes.
6. Dyno Testing: 2-hour break-in cycle on MAHA dyno simulating F30 chassis load. Monitored: oil pressure (min 2.5bar at idle), boost curve (18psi peak), and VANOS response. Only units passing 340i-specific power band (326hp @ 5,500rpm) receive certification.