Mazda CX-9 3.7L V6 Petrol Engines
from £1,800 to £3,500
Rebuilt units from £1,800 · Common codes: MZI
Get quotes from trusted UK Mazda CX-9 engine specialists. Compare reconditioned and rebuilt prices for CAY1 and PY - 3.7L V6 to 2.5L turbo covered. Get specialist quotes for your CX-9.
Mazda CX-9 3.7L V6 Petrol Engines
from £1,800 to £3,500
Rebuilt units from £1,800 · Common codes: MZI
Mazda CX-9 2.5L Turbo Petrol Engines
from £2,500 to £4,500
Rebuilt units from £2,500 · Common codes: PY-VPS
Mazda CX-9 Grey Import V6 Engines
from £1,900 to £3,600
Rebuilt units from £1,900 · Common codes: MZI

Most replacements completed within 3-5 days.
The table below shows typical UK rebuilt engine costs across Mazda CX-9 variants - compare failure causes, engine codes, fuel types, and price ranges to benchmark what UK drivers are paying.


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Not sure which variant your Mazda CX-9 is- Enter your registration number above - we’ll identify the exact sub-model, engine code and compatible replacement options instantly.

Every engine code fitted to the Mazda CX-9 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.
Extracted from detailed petrol and performance engine families across Mazda CX-9 variants.

MZI - 3.7L Petrol
Main replacement demand comes from timing-chain, cooling-system and performance thermal-management faults.
Compatible variants
Avg. rebuilt price
£1,800 - £3,200
Supply only
Technical specifications
Common failures
Not sure which 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 Mazda CX-9 engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.

The Mazda CX-9 relies on two main engine families in the UK: the older 3.7L MZI V6 and the newer 2.5L PY-VPS turbo. While the MZI offers robust power, it is prone to timing chain and VVT failures, whereas the PY-VPS faces turbo and carbon buildup issues. Every rebuilt engine supplied through EngineMarket includes upgraded internal components designed to...
Mazda CX-9 Timing Chain Tensioner Failure
Most affected vehicles
Mazda CX-9 Sport, Luxury, Grand Touring (2006-2015, MZI)
Failure mileage range
80,000 - 100,000 miles
Typical failure window
Root cause
The hydraulic timing chain tensioner loses oil pressure, allowing the chain to slacken, jump teeth, or snap, causing catastrophic valve-to-piston contact.
Repair options & estimated costs (UK ranges)
| Repair tier | Dealer price | Specialist price | What it involves | Longevity / suitability |
|---|---|---|---|---|
| Minor - Preventative Chain Replacement | £1,800 - £2,500 | £1,200 - £1,600 | Replace chain, tensioners, and guides without removing the engine. | Viable only if caught early before chain slack causes internal damage. |
| Full Replacement - Rebuilt MZI Engine | £6,000 - £8,000 | £3,500 - £4,800 | Supply and fit a rebuilt MZI with upgraded tensioners and tested internals. | The only safe option once the chain has jumped or internal damage is confirmed. |
Our recommendation
If you hear a cold-start rattle on your MZI V6, do not ignore it. A preventative chain replacement at a specialist saves thousands compared to the cost of a full engine replacement once the timing jumps. However, if the engine has already lost compression, a rebuilt unit with upgraded tensioners is the only reliable fix.
Compare rebuilt MZI engine prices for your Mazda CX-9
Every engine type is available through the UK network with typical price ranges based on variant, engine code and budget.
Compare Mazda CX-9 engine prices with vetted UK suppliers
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Mazda CX-9 within hours.

Every displacement fitted to the model is listed, with compatible engine codes, years and common failure notes.
Introduced with the second-generation TC chassis, the 2.5L SKYACTIV-G turbo replaced the older V6 to meet modern emissions and efficiency standards while retaining strong torque for the heavy SUV body.
Engine Code(s)
PY-VPS
Compatible Models (UK)
Sport, Luxury, Grand Touring
Power output
Verified by registration
Common Failure Points
Turbocharger oil seal leaks, intake valve carbon buildup at higher mileage
Production Years: TC, 2016-Present
Compare Mazda CX-9 2.5L petrol engine prices
Choose your Mazda CX-9 engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from early TB V6 imports to the latest TC turbo models.
The UK Mazda CX-9 range is exclusively petrol, spanning the grey-import 3.7L V6 era and the modern 2.5L turbocharged four-cylinder generation.
Common Mazda CX-9 Petrol Engine Families
Found In
Known For
Typical Petrol Models
The UK Mazda CX-9 range is exclusively petrol, spanning the grey-import 3.7L V6 era and the modern 2.5L turbocharged four-cylinder generation.
Common Mazda CX-9 Petrol Engine Families
Found In
Known For
Typical Petrol Models
Not sure which fuel type your Mazda CX-9 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 Mazda CX-9 specialists.

Use this Mazda CX-9 year guide to match your vehicle to the right engine family, production period, and replacement options.
⚙Key Changes
▣Main Engines
MZI- 3.7L petrol (Sport, Luxury)
▰Popular Models
🔧Known For
Engine Codes Covered:
MZI