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Jimmy
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“Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
Diamante Marketplace
Mitsubishi Diamante Engine ReplacementCompare Quotes from UK Specialists
Get quotes from trusted UK Mitsubishi Diamante engine specialists. Compare reconditioned and rebuilt prices for 6G72 and 6G74 - 3.0L to 3.5L V6 covered. Get specialist quotes for your Diamante.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Diamante 2.0L V6 Engines- from £950 to £2,400
Rebuilt units from £950
Common codes: 6A12, 6A12SOHC, 6A12DOHC, 6G71
Diamante 2.5L V6 Engines- from £1,100 to £2,800
Rebuilt units from £1,100
Common codes: 6G73, 6A13, 6G72, 6G74
Diamante 3.5L V6 Engines- from £1,800 to £4,200
Rebuilt units from £1,800
Common codes: 6G74, 6G73, 6A13
🔒 Secure enquiry - no spam, no pressure. Genuine quotes only from vetted UK Mitsubishi Diamante specialists.
Instant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialists
Instant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialists
How It Works
3 Simple Steps3 Simple Stepsto Finding the Best Mitsubishi Diamante Replacement Engineto Finding the Best Mitsubishi Diamante Replacement Engine
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
Most replacements completed within 3-5 days.
Live UK Engine Market Data
Diamante Engine Replacement
What Are UK Drivers Paying for Mitsubishi Diamante Engine Replacement-
The table below shows typical UK rebuilt engine costs across Mitsubishi Diamante variants - compare failure causes, engine codes, fuel types, and price ranges to benchmark what UK drivers are paying.
Average Market Prices
Last updated: 4 Aug 26, 9:26
Customer Reviews
Trusted by Mitsubishi Diamante OwnersAcross the UK
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Rated 4.8 out of 5 by 1,081 verified customers who sourced reconditioned and used Mitsubishi Diamante engines through EngineMarket.
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“Got three quotes within an hour and chose the best deal easily. The whole process was quick, clear and stress-free.”
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“I wasn't sure what I needed, but they helped me identify the right engine and connected me with a trusted garage.”
Google
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Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
- Jimmy, London
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Variants We Cover
Mitsubishi Diamante Engine ReplacementAll Variants Covered
Mitsubishi Diamante 20E
6A12 2.0L Petrol
Rebuilt Engines: £950-£2,100
Mitsubishi Diamante 20 Espada
6A12 2.0L Petrol
Rebuilt Engines: £1,000-£2,200
Mitsubishi Diamante VR
6A12DOHC 2.0L Petrol
Rebuilt Engines: £1,100-£2,400
Mitsubishi Diamante 25V
6G73 2.5L Petrol
Rebuilt Engines: £1,100-£2,600
Mitsubishi Diamante Wagon
6G73 2.5L Petrol
Rebuilt Engines: £1,200-£2,700
Mitsubishi Diamante LS
6G74 3.5L Petrol
Rebuilt Engines: £1,800-£4,200
Not sure which variant your Mitsubishi Diamante is- Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.
Engine Codes
Mitsubishi Diamante Engine CodesMitsubishi Diamante Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Mitsubishi Diamante across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Petrol Engines
Extracted from detailed petrol and performance engine families across Mitsubishi Diamante variants.
Extracted from detailed petrol and performance engine families across Mitsubishi Diamante variants.
Can't find your engine code-
Can't find your engine code- Enter your registration number above - we'll instantly identify the exact unit, its technical specifications, and live replacement prices from UK Mitsubishi Diamante engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.
Common Problems
Mitsubishi Diamante Engine Problems
The Mitsubishi Diamante's 6A12 and 6G7x V6 engines are generally robust, but UK grey import owners commonly face timing belt failures, low-RPM misfires, and valve noise...
Every rebuilt engine includes a minimum 12-month unlimited mileage warranty.
1. Timing Belt Failure
Why Mitsubishi Diamante Engines Suffer Catastrophic Damage
Most Affected Vehicles
Diamante 20E
20 Espada
VR
25V
Production Years: 1990 - 2005
Engine: 6A12 / 6G73 / 6G74
Failure Mileage Range
60,000-90,000 miles if not replaced preventatively
Typical failure window
Root Cause
The 6A12/6G7x family are interference engines; a snapped timing belt causes pistons to strike valves, bending both.
Repair Options & Estimated Costs (UK ranges)
| Repair Tier | Dealer Price | Specialist Price | What It Involves | Longevity / Suitability |
|---|---|---|---|---|
Preventative Belt Replacement - Before failure occurs Minor | £450 - £750 | £300 - £550 | Replace timing belt, tensioner, water pump, seals | Restores factory service interval; recommended at 60k miles |
Full Replacement - Rebuilt Engine - After belt snap Best Value | £3,200 - £5,500 | £1,800 - £4,200 | Supply & fit rebuilt unit with upgraded components, bench tested | New-engine reliability; only viable option after valve damage |
Our Recommendation
Best next step for timing belt failure
If your Diamante is still running and the belt is overdue, invest in preventative replacement. If the belt has snapped, cylinder head damage is almost certain - a rebuilt engine is the only cost-effective solution for grey imports.
Don't Let Engine Failure Write Off Your Mitsubishi Diamante
Whether you're facing a snapped timing belt, persistent misfire, or valve noise, EngineMarket makes it simple to compare prices from trusted UK Mitsubishi Diamante specialists. Every rebuilt engine includes upgraded components addressing the original failure point, bench testing, and a minimum 12-month unlimited mileage warranty. Get back on the road without the main dealer premium.
Compare Mitsubishi Diamante Engine Replacement Prices Now →Mitsubishi Diamante Engine Problems
What It Costs to Fix & When Replacement Makes Sense
Replacement Engine Options
Mitsubishi Diamante Replacement Engine Types
Every Mitsubishi Diamante engine type is available through our UK network with typical price ranges based on variant, engine code and budget.
Mitsubishi Diamante Reconditioned Engines (Recon)£950 - £2,800(supply only)
Mitsubishi Diamante Rebuilt Engines£1,100 - £4,200(supply only)
Mitsubishi Diamante Used Engines£650 - £1,900(supply only)
Mitsubishi Diamante Remanufactured Engines£1,400 - £4,500(supply only)
Mitsubishi Diamante Supply & Fit Engines
Complete engine replacement service including removal, fitting, fluids and initial run-in by UK specialists familiar with grey imports.
Typical Price
£450 - £950
(added to engine price)
Engine Sizes
Mitsubishi Diamante Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the Mitsubishi Diamante is listed below with compatible engine codes, production years and common failure notes to help you identify the correct replacement.
The 2.0L V6 powered early first-generation Diamante models and remains the most common engine in UK grey imports, with strong JDM parts availability and straightforward compatibility across 20E and Espada trims.
| ENGINE CODE(S) | 6A12, 6G71, 6A12SOHC, 6A12DOHC |
| COMPATIBLE MODELS (UK) | 20E (1990-1996), 20 Espada (1994-1996), VR |
| PRODUCTION YEARS | 1992-1996 |
Common Failure Points
Timing belt failure (interference), hydraulic lash adjuster noise, vacuum solenoid idle issues
Not sure which engine size your Mitsubishi Diamante needs- Enter your registration number above - we'll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EngineMarket include a minimum 12-month unlimited mileage warranty from UK Mitsubishi Diamante specialists.
Mitsubishi Diamante Engines Fuel Type
Mitsubishi Diamante Engines by Fuel Type
Choose your Mitsubishi Diamante engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from early 20E to the latest LS.
All Mitsubishi Diamante models sold as grey imports in the UK used petrol V6 engines, with the 2.0L 6A12 and 2.5L 6G73 dominating replacement enquiries due to high registration volumes.
Common Mitsubishi Diamante Petrol Engine Families
6A12
most common replacement engine (20E/VR), timing belt risk
6G73
second-gen workhorse (25V/Wagon), misfire under 2000 RPM
6G74
premium LS unit, oil consumption at high mileage
6A13
less common 2.5L, verify fitment before ordering
Found In
First Generation (1990-1996)
6A12, 6G71
Second Generation (1997-2005)
6G73, 6G74, 6A13
Known For
Interference engine design requires strict timing belt maintenance
Hydraulic lash adjuster noise common on cold start
Strong JDM parts availability via UK import specialists
Misfire issues often linked to vacuum solenoid or CMP sensor
Typical Petrol Models
20E20 EspadaVR25VWagonLS
Not sure which fuel type your Mitsubishi Diamante has- Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK Mitsubishi Diamante specialists.
Engine Years
Mitsubishi Diamante Engines by YearWhat Was Fitted & When
This timeline covers all major engine changes across the Mitsubishi Diamante's production run, organised so UK grey import owners can quickly identify their engine and compare rebuilt prices from specialists.
1990 - 1993 - First Generation Launch
Major Platform Change
The Diamante debuted with the 6A12 2.0L V6, establishing the engine family that would dominate UK grey import replacements for over a decade.
Key Changes
Mitsubishi Diamante launched as JDM executive sedan
6A12 SOHC 24v V6 introduced as standard engine
Early models featured distributor ignition and mechanical fuel injection
Australian production began for right-hand drive exports
Known For
Robust V6 design with good JDM parts availability
Timing belt service critical (interference engine)
Distributor ignition failures on high-mileage examples
Strong foundation for later engine developments
Main Engines
6A12 - 2.0L petrol (20E base trim)
6G71 - 2.0L petrol (early pre-facelift units)
Popular Models
Mitsubishi Diamante 20E
Mitsubishi Diamante base JDM import
Engine Codes Covered
6A126G71
Common Replacement Enquiries
Get quotes for 1990-1993 Mitsubishi Diamante replacement engines
1990 - 1993 - First Generation Launch
Major Platform Change
The Diamante debuted with the 6A12 2.0L V6, establishing the engine family that would dominate UK grey import replacements for over a decade.
Key Changes
Mitsubishi Diamante launched as JDM executive sedan
6A12 SOHC 24v V6 introduced as standard engine
Early models featured distributor ignition and mechanical fuel injection
Australian production began for right-hand drive exports
Known For
Robust V6 design with good JDM parts availability
Timing belt service critical (interference engine)
Distributor ignition failures on high-mileage examples
Strong foundation for later engine developments
Main Engines
6A12 - 2.0L petrol (20E base trim)
6G71 - 2.0L petrol (early pre-facelift units)
Engine Codes Covered
6A126G71
Popular Models
Mitsubishi Diamante 20E
Mitsubishi Diamante base JDM import
Common Replacement Enquiries
Get quotes for 1990-1993 Mitsubishi Diamante replacement engines
FAQ
Mitsubishi Diamante Engine ReplacementFrequently Asked Questions
Question 1Where can I buy a Mitsubishi Diamante engine in the UK-
UK owners source Diamante engines via specialist JDM importers, breaker networks, and EngineMarket's comparison service connecting you with vetted suppliers.
- Diamante was never officially sold new in the UK by Mitsubishi
- All engines are sourced from Japanese or Australian grey imports
- EngineMarket compares prices from 100+ UK specialists instantly
- Verify engine code (6A12, 6G73, etc.) before ordering
- Request compression test results and warranty terms
Question 2What engines fit a Mitsubishi Diamante-
The 6A12, 6G73 and 6G74 are direct fits; 6A13 compatibility requires verification of mounts and electronics before purchase.
- 6A12 fits all first-gen Diamante variants (1990-1996)
- 6G73 is standard for second-gen 25V and Wagon models
- 6G74 is exclusive to LS trim (1997-2005)
- Galant/Legnum engines may fit but confirm mounting points
- Always cross-reference chassis code and ECU compatibility
Question 3How much to replace a Mitsubishi Diamante engine-
Rebuilt Diamante engines range from £950 for 6A12 units to £4,200 for 6G74 LS engines, plus £450-£950 for supply & fit labour.
- Used JDM engines start around £650-£1,900 supply-only
- Rebuilt 6A12/6G73 units typically £1,100-£2,800
- LS 6G74 rebuilt engines command £1,800-£4,200
- Supply & fit labour adds £450-£950 depending on location
- All EngineMarket quotes include minimum 12-month warranty
Question 4Is a Diamante engine the same as a Galant-
Many Diamante engines share architecture with Galant/Legnum, but mounting points, ECU and ancillaries often differ - verify before swapping.
- 6A12 and 6G73 blocks are shared across Mitsubishi platforms
- Engine mounts, wiring harnesses and ECU may not interchange
- Transmission bellhousing patterns usually match within family
- Always confirm variant-specific fitment with your supplier
- EngineMarket specialists verify compatibility before dispatch
Question 5Why is my Diamante misfiring at low RPM-
Low-RPM misfire on 6G73/6G74 engines is commonly caused by vacuum solenoid MR450086 or camshaft position sensor failure.
- Fault codes P0300-P0306 indicate cylinder misfire
- Vacuum solenoid failure disrupts idle air control
- CMP sensor issues cause timing errors below 2000 RPM
- Replace faulty sensor/solenoid before considering engine rebuild
- Diagnostic testing costs £80-£150 at specialist garages
Question 6Do you warranty JDM import engines-
Yes - every engine supplied through EngineMarket includes a minimum 12-month unlimited mileage warranty from vetted UK specialists.
- Warranty covers parts and labour for manufacturing defects
- Compression test results provided before dispatch
- Warranty valid at any UK garage, not just supplying specialist
- Keep service records to maintain warranty validity
- Claim process managed via EngineMarket support team
Question 7Will a 6A13 fit my Diamante-
The 6A13 is not a guaranteed direct fit; verify mounting points, ECU compatibility and ancillary locations before ordering.
- 6A13 shares displacement with 6G73 but different architecture
- Engine mounts and transmission flange may not align
- ECU and wiring harness likely require adaptation
- Most UK specialists recommend 6G73 as safer replacement
- EngineMarket compatibility check prevents wrong orders
Question 8How long does a Diamante engine last-
With proper maintenance, Diamante V6 engines regularly exceed 150,000 miles; timing belt service at 60k miles is critical to avoid catastrophic failure.
- 6A12 and 6G73 are robust designs when serviced correctly
- Timing belt replacement every 60k miles prevents valve damage
- Use manufacturer-spec oil to protect hydraulic lash adjusters
- Address misfires promptly to avoid catalytic converter damage
- Rebuilt engines with upgraded components can exceed original lifespan
Question 9Can I fit a Diamante engine myself-
While mechanically possible, most UK garages decline grey import work; EngineMarket's supply & fit service connects you with experienced specialists.
- Diamante engine swaps require JDM wiring/ECU knowledge
- Many mainstream garages lack grey import experience
- Supply & fit bundles save time and ensure warranty validity
- Labour costs £450-£950 depending on location and complexity
- Request itemised quote separating engine cost and fitting
Question 10What causes 6A12 timing belt failure-
Age, heat cycling and inadequate tensioner maintenance cause 6A12 timing belt failure; replacement every 60k miles prevents catastrophic valve damage.
- 6A12 is an interference engine - snapped belt bends valves
- Tensioner wear allows belt slap and premature failure
- Water pump replacement recommended during belt service
- Use OEM-spec belts and tensioners for reliability
- EngineMarket rebuilt units include upgraded timing components
Why Choose Us
Why UK Mitsubishi Diamante Owners Trust EngineMarket
Join thousands of UK drivers who compare Mitsubishi Diamante engine prices through our network of trusted specialists - every rebuilt and reconditioned unit backed by a minimum 12-month unlimited mileage warranty and nationwide delivery.
Trusted Mitsubishi Diamante Engine Suppliers
Every garage and engine rebuilder in our network is vetted, rated, and reviewed by real Mitsubishi Diamante owners.
Compare Mitsubishi Diamante Engine Replacement Companies
See prices, warranty terms, and supply & fit options side-by-side before you commit.
UK Engine Replacement Services for Mitsubishi Diamante
Covering every variant from 20E to LS, with supply-only or full supply & fit available nationwide.
Find the best Mitsubishi Diamante engine replacement near you
Compare engine prices for Mitsubishi Diamante in the UK and get competitive quotes from garages near you.
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