A tested used SHY4 should come with a donor story: Reg, mileage records and compression or running-test evidence, plus a written components list. Reviewed records put the code in a 175 PS CX-5 application context, so the unit must match your vehicle's configuration — not merely its family.
MAZDA REPLACEMENT ENGINES • UK
Used SHY4 Engines (2.2 SkyActiv-D 175) — Buying a Tested Donor the Right Way
A used SHY4 engine can be the smartest money you spend — or the start of a second failure. These 2.2-litre SkyActiv-D units are recorded for the CX-5 at 175 PS (with grouped Mazda 6 references), and the difference between a good buy and a bad one is evidence. Here's what to demand.
Find the right engine for your Mazda
✓ Used & reconditioned✓ Supply or fitting✓ Compare quotes
What should a used SHY4 unit include?
Expect a complete 2.2-litre SkyActiv-D from a known donor, with ancillaries matched to your vehicle. The code is recorded in 175 PS CX-5 applications (KE/GH, 2012–2017 cited) with grouped Mazda 6 references — so the donor's configuration has to line up with yours before it's offered.
Which Mazdas take a used SHY4?
Records link SHY4 to the CX-5 with grouped Mazda 6 references. Verify the marking on the unit against your Reg, and check drivetrain, emissions hardware and ancillaries — the family name alone isn't enough.
CX-5 and Mazda 6 hubs plus the SHY4 guide cover the detail.
| Model | Generation / body | Engine | Output | Evidence status |
|---|---|---|---|---|
| Mazda CX-5 | KE/GH (2012–17 cited) | 2.2 SkyActiv-D | Per the SHY4 record | Reviewed European OEM-linked record |
| Mazda Mazda 6 | Grouped references | 2.2 SkyActiv-D | Shared context | Grouped record — not a universal fitment claim |
| UK derivatives | — | — | — | Still to confirm — check the code against your Reg and Mazda EPC |
What should you check on a used 175 PS diesel?
The 2.2 family's two known themes — carbon build-up and oil dilution — drive the questions you ask.
Wider family picture: engine directory.
Test evidence: numbers, not vibes.
Servicing and DPF history: dilution habits travel with the engine.
Ancillaries: what's included, what swaps over.
Cold start: listen and look before you commit.
Used, reconditioned or supply-and-fit — what suits a 175 PS?
Tested used is the value route with solid evidence; reconditioned suits long-term keepers; supply-and-fit if you want one quote covering everything.
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.
1
Most requested
Mazda 6 2.2 SkyActiv-D Engine SH-VPTR / SHY family
Used & reconditioned · Business seller
Get multiple engine quotes across the UK
Typical fitment: Mazda 6
Engine option: SH-VPTR / SHY family
Top UK demand — the diesel most often researched for replacement
Seller from trusted UK supplier network
2
Mazda CX-5 2.2 SkyActiv-D Engine SHY1 / SHY4 / SHY6
Used & reconditioned · Business seller
Get multiple engine quotes across the UK
Typical fitment: CX-5
Engine option: SHY1 / SHY4 / SHY6
High demand; output and code vary by year
Seller from trusted UK supplier network
3
Mazda 3 2.0 SkyActiv-G Engine PE-VPS
Used & reconditioned · Business seller
Get multiple engine quotes across the UK
Typical fitment: Mazda 3
Engine option: PE-VPS
Volume petrol with several applications
Seller from trusted UK supplier network
4
Mazda CX-3 1.5 SkyActiv-D Engine S5-DPTR
Used & reconditioned · Business seller
Get multiple engine quotes across the UK
Typical fitment: CX-3
Engine option: S5-DPTR
Steady CX-3 DK diesel demand
Seller from trusted UK supplier network
5
Mazda 2 1.5 SkyActiv-G Engine P5-VPS
Used & reconditioned · Business seller
Get multiple engine quotes across the UK
Typical fitment: Mazda 2
Engine option: P5-VPS
Small-car petrol volume
Seller from trusted UK supplier network
6
Mazda MX-5 1.5 / 2.0 SkyActiv-G Engine
Used & reconditioned · Business seller
Get multiple engine quotes across the UK
Typical fitment: MX-5
Enthusiast-driven demand
Seller from trusted UK supplier network
7
Mazda CX-60 3.3 e-Skyactiv D Engine T3Y4
Used & reconditioned · Business seller
Get multiple engine quotes across the UK
Typical fitment: CX-60
Engine option: T3Y4
Newest diesel; near-new donor market
Seller from trusted UK supplier network
8
Mazda CX-30 2.0 SkyActiv-G Engine PE-VPS / PEX family
Used & reconditioned · Business seller
Get multiple engine quotes across the UK
Typical fitment: CX-30
Engine option: PE-VPS / PEX family
Growing volume
Seller from trusted UK supplier network
9
Mazda BT-50 3.2 Duratorq diesel Engine P5-AT
Used & reconditioned · Business seller
Get multiple engine quotes across the UK
Typical fitment: BT-50
Engine option: P5-AT
Commercial workhorse demand
Seller from trusted UK supplier network
10
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
Seller from trusted UK supplier network
How do you vet a used SHY4 before buying?
Code and configuration: unit marking vs Reg.
Donor records: Reg, mileage, history.
Tests: compression or running evidence.
Components: written list, signed.
Terms: warranty, delivery, returns.
Used SHY4 questions
Is a 175 PS used unit worth more than a 150 PS?
Price should follow condition and evidence, not output alone. The code and configuration must match your car — after that, paperwork decides value.
What mileage is acceptable?
Documented mileage beats low mileage. A well-recorded higher-mileage unit can outlast a low-mileage one with a mystery history.
Do used SHY4 units need coding?
Often there are electronic steps at installation — get them listed in the quote or fitting plan so nothing is discovered halfway through.
Can I hear it run first?
Where possible, yes — or insist on test evidence. On diesels, a cold start tells you more than any description.
READY FOR THE NEXT STEP?
Check My Registration →Get tested used SHY4 quotes
Start with your registration, compare used SHY4 offers on evidence, and buy on records. 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.