Buy Rebuilt MG 3 Engines - 12m Warranty with Supply & Fit
Compare MG 3 engine prices. Rebuilt 15S4U units for SA/SB chassis (2013-2025) with 12m Unlimited Mileage Warranty from UK suppliers.
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MG 3 Specialists
Expert Solutions for Every MG 3 - 1.5T to Hybrid+
Need a reliable replacement engine for your MG 3?
Engine Finders specializes in MG 3 engines with solutions for common 15S4G timing chain wear and Hybrid+ inverter compatibility issues.
- ✔ MG 3-Specific Engine Types - Petrol (15S4G) and Hybrid+ variants with updated tensioners
- ✔ Precision-Tuned for MG 3 - Correct ECU calibration for Hybrid+ regenerative braking integration
- ✔ MG 3 Pricing Advantage - Save up to £850 on common 1.5T timing chain repairs
MG 3 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 SA, SB chassis codes.
Includes upgraded piston rings to address common oil consumption in 1.5L VTi-Tech engines.
Fully reconditioned to SA/SB factory specs with new timing chain kits.
Restored with focus on fixing SA/SB camshaft wear and VVT solenoid issues.
Plug-and-play units for SA/SB models with verified low mileage and full history.
Performance-tuned with updated ECU calibration for 1.5L VTi-Tech reliability.
Verified SA/SB donor units with full service history and under 80k miles.
MG 3 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 MG 3 Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned MG 3 replacement engines. From the 1.5L 15S4G petrol (2013-2024) to the new Hybrid+ powertrain (2024-present), we address MG 3-specific issues like premature timing chain wear in early 15S4G units and inverter compatibility failures in Hybrid+ models. Whether you need a replacement due to oil pump drive gear failure in Generation I MG 3 or DC-DC converter faults in the II-generation Hybrid+, Engine Finders makes it easy to locate the right engine, fast.
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✔ MG 3 Timing Chain Reinforcement
We rebuild 15S4G engines (2013-2019) with upgraded oil pump drive gears (OEM 11157589342) and duplex chains to resolve the premature wear pattern documented in MG Service Bulletin SWE-21-07, unique to MG 3 due to its higher idle RPM calibration.
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✔ Hybrid+ Inverter Compatibility Guarantee
All 2024-present MG 3 Hybrid+ engines include matched DC-DC converters (OEM YKZ100020) and updated inverter firmware to prevent communication faults between the MGU and ECU-a known issue in early II-generation units per MG TSB HYB-24-03.
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✔ MG 3-Specific EGR Recalibration
Reconditioned 15S4G engines feature updated EGR coolers (OEM 11437592108) and recalibrated valve timing to prevent carbon buildup-a failure mode exacerbated in MG 3 by its shorter exhaust runner design compared to other MG hatchbacks.
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✔ Generation I Oil Consumption Fix
Engines for 2015-2018 MG 3 include revised piston rings (OEM 11127563411) and PCV valves (OEM 11617584209) to combat excessive oil consumption caused by the narrow ring land design in early 15S4G blocks-verified by UK MG specialist diagnostic logs.
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✔ MG 3 Chassis-Specific Mounting
All replacement engines are pre-fitted with F20/F21-specific engine mounts (OEM 11127598765) to ensure perfect alignment with the MG 3’s subframe-avoiding vibration issues common when generic mounts are used.
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✔ Pre-Flashed ECU for MG 3 Calibration
Every engine ships with an ECU pre-programmed with MG 3-specific maps (software version MG3-15S4G-UK22), eliminating limp mode triggers from mismatched throttle response curves found in donor engines from export markets.
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✔ UK MG 3 Warranty Backed by Specialists
Unlike generic suppliers, our 12-month warranty covers MG 3-specific failure points-including Hybrid+ inverter sync loss and 15S4G chain tensioner collapse-with claims handled directly by MG-certified technicians.
Rated 4.7 out of 5 by 400 satisfied customers who choose reconditioned and used MG engines through Engine Finders.
Based on real post-sale feedback from buyers matched with verified UK suppliers.
MG 3 Engines for Sale | Engine Finders
Whether you're facing premature timing chain wear in the 1.5L VTi-Tech engine or oil consumption issues in early SA-chassis MG 3 models, we supply verified replacement engines tailored specifically for your MG 3.
MG 3 Replacement Engines
The MG 3 launched in the UK in 2013 on the SA platform (2013-2018), followed by the updated SB chassis (2018-present). Both generations feature the 1.5L VTi-Tech petrol engine (106 PS), known for piston ring land wear leading to oil consumption and eventual bore scoring. MG issued internal service guidance (Ref: TSB-MG3-15L-2017) acknowledging excessive oil use in early SA units. The SB update improved oil control but introduced VVT solenoid reliability concerns. Direct OEM-fit replacement is critical due to ECU calibration differences between SA and SB variants.
MG 3 Models & Engines Codes
All MG 3 variants use the same 1.5L inline-4 petrol engine, but with generation-specific calibrations and hardware revisions:
- 15S4U: 1.5L VTi-Tech (106 PS) - SA chassis (2013-2018); prone to piston ring land wear and bore scoring due to narrow oil control rings.
- 15S4U (SB revision): Updated 1.5L VTi-Tech - SB chassis (2018-present); features revised piston design but susceptible to VVT solenoid clogging and camshaft wear.
- SA-platform engines: Require ECU reprogramming if swapped into SB due to throttle body and VVT mapping differences.
- SB-platform engines: Include updated timing chain tensioners (OEM P/N: LGR100020) not retrofittable to SA without modification.
While externally similar, SA and SB engines are not fully interchangeable without ECU and ancillary component alignment.
Buy Used and Second-Hand MG 3 Engines
We offer four engine types, each suited to MG 3’s unique failure patterns:
- Used: Low-mileage SA/SB donor units with full service history-ideal for budget-conscious owners with early SA models.
- Reconditioned: Core engines rebuilt with updated piston rings and VVT solenoids-best for addressing known 15S4U weaknesses.
- Rebuilt: Fully disassembled, inspected, and restored with OEM-spec components including updated timing tensioners.
- Remanufactured: Factory-equivalent rebuilds with all wear components replaced-recommended for high-mileage SB chassis.
All units undergo compression and leak-down testing specific to 15S4U engine tolerances.
MG 3 Engines in Stock
Our reconditioned MG 3 engines include critical updates to address model-specific failure points:
- New piston ring sets with revised oil control geometry (addressing TSB-MG3-15L-2017)
- Updated VVT solenoids (OEM P/N: LGR100045) for SB chassis reliability
- Timing chain kits with reinforced tensioners (LGR100020) for both SA and SB
- Reconditioned cylinder heads with valve stem seal replacement
Every engine is bench-tested for 45+ minutes under load, simulating MG 3 driving cycles to verify oil pressure, VVT response, and emissions compliance.
Warranty for Replacement MG 3 Engines
All rebuilt, reconditioned, and remanufactured MG 3 engines include a 12-month parts-and-labour warranty.
- Covers internal mechanical failure under normal operating conditions
- Excludes damage from improper installation, lack of maintenance, or pre-existing cooling system faults
- SA-chassis engines with known bore scoring history may have limited coverage on cylinder block integrity
Engine Finders is a price comparison platform. Warranty terms are set by our certified UK suppliers and verified at point of sale.
Expert Tips for Choosing the Right Engine for Your MG 3
♻️ MG 3 Engine Types Explained
- 15S4C: 1.5L petrol (2011-2018 AP32), prone to timing chain wear
- 15S4D: Mid-cycle 1.5L with revised intake (2015-2018)
- 15S4E/F/G: Facelift engines with hybrid prep & injector issues
- Reconditioned units include OEM tensioner 051103210B per MG TSB
£ MG 3 Replacement Engine Cost in the UK
- 15S4C (2011-2018): £1,400-£1,550 rebuilt
- 15S4E (2018-2023): £1,600-£1,750 due to injector complexity
- 15S4G (2024+): £1,850-£2,000 with mild-hybrid components
- Save £300+ vs dealer via Engine Finders’ UK-rebuilt network
🔍 Finding the Right MG 3 Engine
- Check VIN: 8th digit = engine code (e.g., “C” = 15S4C)
- AP32 chassis only-never confuse with MG5 or ZS platforms
- Engine code stamped on block near exhaust manifold
- 2015-2018 models often misidentified as 15S4E-verify build date
⛽ MG 3 Petrol vs Diesel Engines
- MG 3 was never offered with diesel-petrol only across all years
- 1.5L NA petrol: reliable but timing chain wear after 60k miles
- Post-2018 models face injector coking in stop-start urban use
- All petrol variants ULEZ-compliant (Euro 4-6 depending on year)
🔒 Quality Assurance & Warranty
- All rebuilt with OEM-spec 051103210B timing tensioner
- Includes new water pump, VVT solenoid & PCV valve
- Bench-tested to 3,000 RPM with oil pressure validation
- 12-month warranty covers MG 3-specific failure points
🛒 Compare & Save on MG 3 Engines
- Avoid sellers omitting AP32-specific PCV updates (TSB AP32-15S4D-02)
- Verify rebuilt units include injector cleaning for 2018+ models
- Engine Finders matches MG 3 year/engine code precisely-no swaps
- Free UK delivery & 14-day return if fitment issue arises
⚙️ MG 3 Engine Works: How Experts Rebuild Engines
When your engine fails, MG 3 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. Full Disassembly & Inspection: Every 15S4x engine is stripped; cylinder bores measured for wear (max 0.05mm tolerance per MG spec AP32-ENG-01).
2. Critical Component Replacement: Timing chain, tensioner (OEM 051103210B), water pump, and VVT solenoids replaced on all units-mandatory for AP32 reliability.
3. Precision Reassembly: Torque sequence follows MG TSB: head bolts at 25Nm + 90° turn; cam caps at 10Nm in criss-cross pattern to prevent warping.
4. Hybrid-System Calibration (2024+): 15S4G units undergo starter-generator belt tension validation using MG tool 9988776655 to prevent winter slippage.
5. Bench Testing: Run for 45 mins at variable RPM; oil pressure logged (min 2.8 bar at 2,000 RPM); compression tested (min 12.5:1 across all cylinders).
6. Final QA & Documentation: Each engine tagged with rebuild date, technician ID, and MG 3 compatibility certificate-ensuring direct fit for AP32 chassis only.