On a mild-hybrid diesel, the rebuild scope includes the electronic integration. A reconditioned T3Y4 is a complete 3.3 inline-six brought back to specification — measured, machined, assembled, tested — and the starter-generator, battery system and calibration compatibility have to be part of the conversation. Reviewed records place the code in the CX-60 254 AWD (2022) at 254 PS / 550 Nm.
MAZDA REPLACEMENT ENGINES • UK
Reconditioned T3Y4 Engines (3.3 e-Skyactiv D) — Rebuilding a Mild-Hybrid Six
A reconditioned T3Y4 engine isn't just a mechanical rebuild — it's a 3.3-litre e-Skyactiv D inline-six with mild-hybrid hardware, and the electronics have to come back with it. This page shows CX-60 owners what a proper rebuild includes, what to ask about the hybrid side, and how to compare builders.
Find the right engine for your Mazda
✓ Used & reconditioned✓ Supply or fitting✓ Compare quotes
What should a T3Y4 rebuild specify?
A rebuilt T3Y4 must return as a 3.3-litre e-Skyactiv D built for your CX-60's configuration — with the cited 254 PS / 550 Nm belonging to the 254 AWD application, not to every variant. Note the turbo layout (one twin-scroll unit), and confirm part numbers before parts are ordered.
Which Mazda does a reconditioned T3Y4 suit?
The verified application is the CX-60 254 AWD from 2022. Other CX-60 versions — and every other model including the CX-80 — need separate verification. The rebuild should be built and recorded for your vehicle.
Vehicle context: CX-60 hub; code context: T3Y4 guide.
| Model | Generation / body | Engine | Output | Evidence status |
|---|---|---|---|---|
| Mazda CX-60 | 254 AWD (2022 cited) | Diesel | 254 PS / 550 Nm | Reviewed application record — not established for CX-80 |
| Other derivatives | — | — | — | Still to confirm — check the code against your Reg and Mazda EPC |
What should a T3Y4 rebuild put right?
Young engine, thinner fault record — so the rebuild must be provable. Recorded themes so far: DPF/regeneration behaviour and AdBlue/NOx attention.
Family context: engine directory.
What was measured, machined and replaced — itemised.
How the hybrid system and electronics were assessed and reinstated.
What testing was completed, including calibration checks.
Reconditioned, used or supply-and-fit — which route for a T3Y4?
A reconditioned unit makes sense when you want documented internals and documented electronic integration; a low-mileage used donor works if provenance is airtight; supply-and-fit suits workshops equipped for mild-hybrid commissioning.
01
Used Engine
- What it is
- A complete donor unit, tested before sale
- Best for
- Faster, cheaper routes with honest donor history
- What to compare
- Mileage records, donor Reg, compression and running-test evidence
- What it is
- A complete unit stripped, measured, machined and rebuilt
- Best for
- Owners keeping the car long-term
- What to compare
- Machining and measurement records, replaced-parts list, test results
03
Supply & Fit
- What it is
- Engine, removal, installation and commissioning in one quotation
- Best for
- One-responsibility jobs where downtime matters
- What to compare
- Written component schedule, fitting plan, warranty split and handover
UK's Most Requested Engines — Based on 5,760+ Real Quotes (Last 90 Days)
These are the engines UK drivers ask us about most, ranked by real enquiry traffic through our network — useful context when you're weighing how much homework your engine deserves.
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Mazda CX-5 2.2 SkyActiv-D Engine SHY1 / SHY4 / SHY6
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Mazda CX-60 3.3 e-Skyactiv D Engine T3Y4
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Mazda CX-30 2.0 SkyActiv-G Engine PE-VPS / PEX family
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Mazda BT-50 3.2 Duratorq diesel Engine P5-AT
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Mazda 2.5 SkyActiv-G Petrol Engine
Used & reconditioned · Business seller
Get multiple engine quotes across the UK
Typical fitment: CX-5, Mazda 6, CX-30, Mazda 3
Higher-capacity petrol
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How do you vet a T3Y4 rebuild before you pay?
Identity and variant: built for your CX-60 configuration.
Mechanical records: measurement, machining, assembly, tests.
Hybrid scope: what was checked/replaced on the electronics side.
Calibration: how compatibility is confirmed.
Warranty: written, covering the electronic work too.
T3Y4 rebuild questions
Does the rebuild cover the mild-hybrid system?
It should — ask explicitly what's inspected, replaced or transferred on the starter-generator, battery system and sensors, and how it's documented.
Is the 254 PS figure the same for every T3Y4?
No — the cited 254 PS / 550 Nm belongs to the CX-60 254 AWD application. Variants differ; the build should target your vehicle.
Can the rebuild be fitted to any CX-60?
Only where configuration and calibration match. The verified application is the 254 AWD from 2022 — other versions need their own verification.
What records prove a proper mild-hybrid rebuild?
Mechanical measurement and test sheets plus electronic checks and calibration notes. On this engine, one without the other is half a rebuild.
READY FOR THE NEXT STEP?
Check My Registration →Get reconditioned T3Y4 quotes for your CX-60
Submit your registration and compare rebuild quotations — mechanical and electronic scope side by side. For official specifications and service documentation, cross-check against official documentation — source: Mazda UK's official resources.
Reviewed Mazda engine guidance
Reviewed by the MazdaReplacementEngines technical team against Mazda owner documentation and OEM-linked application records.