Reviewed Mazda engine guidance
Reviewed by the MazdaReplacementEngines.co.uk technical content team. Last updated: 21 September 2026.
MAZDA ENGINE CODE • PEX6
Mazda PEX6 Engine (2.0L e-Skyactiv-G 150): Specs, Common Faults & Replacement
Mazda PEX6 2.0L e-Skyactiv-G 150 engine guide for the Mazda 3, CX-30 - specs, common faults and reconditioned or tested used replacement options with warranty.
✓ Used & reconditioned routes
✓ Supply only or fitted
✓ Vehicle-specific checks before commitment
ENGINE SIZE
2.0L
FUEL TYPE
Petrol (Mild Hybrid)
ENGINE CODE
PEX6 replacement engine options
Related engine size:Mazda 2.0L Engines →
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
Important buying questions
Top Summary / Key Takeaway
If PEX6 appears in a Mazda 3 replacement-engine enquiry, verify the vehicle before ordering. The live page describes PEX6 as a 2.0-litre e-SKYACTIV-G 150 mild-hybrid petrol engine and associates it with Mazda 3 and CX-30, but the Mazda manufacturer material reviewed here confirms the wider SKYACTIV-G 2.0 and M Hybrid context rather than the exact PEX6 code-to-model/output mapping. This guide is for UK owners and workshops comparing tested used, reconditioned or supply-and-fit replacement routes.
Who this guide is for
Audience / use case
For UK Mazda owners, garages and replacement-engine buyers who have been given a PEX6 reference and need to identify the correct unit, decide whether full engine replacement is justified and compare replacement routes.
Engine definition
What is PEX6 on a Mazda engine enquiry?
PEX6 should be treated as an engine identifier that requires vehicle-specific verification. Do not use the identifier alone as final proof of engine capacity, power output, mild-hybrid configuration or compatibility with a Mazda 3 or CX-30.
Source-backed information
What does Mazda officially confirm about Mazda3 2.0 petrol engines?
Mazda's official Mazda3 specifications list SKYACTIV-G 2.0 as a DOHC 16-valve inline-four with 1,998 cc displacement and 83.5 × 91.2 mm bore and stroke in the specification reviewed. Mazda documentation also shows SKYACTIV-G 2.0 among Mazda3 engines equipped with M Hybrid in relevant configurations. These facts support the wider engine context, but they do not independently prove the PEX6 code or the live page's '150' mapping.
External source 2
Mazda Motor Corporation — Mazda3 Electrical System / M Hybrid: https://owners-manual.mazda.com/gen/en/mazda3/mazda3_8hs5ee19i/contents/10020102.html
Verification data to record
| Manufacturer-backed context | Value |
|---|---|
| Mazda3 SKYACTIV-G 2.0 displacement | 1,998 cc |
| Layout | DOHC 16-valve inline-four |
| Bore × stroke | 83.5 × 91.2 mm |
| M Hybrid context | Mazda documentation includes SKYACTIV-G 2.0 among M Hybrid configurations |
| Evidence limitation | These facts do not independently establish PEX6 or a 150-output application |
Compatibility and fitment checks
Does PEX6 definitely fit my Mazda 3 or CX-30?
Not from the code reference alone. Match the UK registration and physical engine identification to the production specification, derivative, transmission/drivetrain, emissions/electronic configuration and relevant mild-hybrid/control hardware before accepting compatibility.
Diagnosis before replacement
Should I replace the engine because of a warning light or poor running?
No, not automatically. Diagnostic scanning and mechanical checks should separate internal engine damage from ignition, fuelling, intake, cooling, lubrication, emissions, sensor, electrical or mild-hybrid/control faults before complete replacement is authorised.
Repair or replacement decision
| Route | What to compare |
|---|---|
| Tested used | Exact identity, disclosed mileage, provenance, testing/condition evidence, included components/electronics, supplier warranty |
| Reconditioned | Documented work, replaced parts, inspections/measurements, test results, included hardware, supplier warranty |
| Supply & fit | Verified engine, removal/installation, fluids/filters, ancillary/electrical transfer, relevant coding/adaptation, commissioning, road test, timing and warranty |
Which PEX6 replacement route should I compare?
Once identity and diagnosis are confirmed, compare tested used, reconditioned and supply-and-fit routes on evidence, included components, warranty, total cost and installation scope rather than headline price alone.
Verify the engine before ordering
Confirm UK registration and full vehicle specification.
Record or photograph the physical engine identification.
Confirm production period and derivative.
Confirm transmission and drivetrain.
Confirm emissions, electronics and any mild-hybrid/control configuration.
Review used-engine mileage/provenance/testing evidence or reconditioning records.
Confirm included components/electronics.
Get warranty, delivery and fitting/commissioning scope in writing.
How do I verify PEX6 before buying?
Start with the UK registration, then record the physical engine identification and require the proposed replacement to be matched to the individual vehicle in writing. If mild-hybrid equipment is present, confirm the relevant electrical/control configuration and installation requirements as well.
Practical matching example
What real evidence should support a PEX6 replacement?
Use genuine evidence from the actual engine or supplier process: engine-identification photographs, donor/provenance records, disclosed mileage, inspection/testing records or documented reconditioning work. Do not invent screenshots, tests, customer cases or first-hand experience simply to satisfy an SEO signal.
When available, add an owned identification photograph plus an anonymised supplier test checklist, condition report or reconditioning record from a genuine PEX6-related enquiry. Explain exactly what each asset proves and remove customer-identifying information.
Concrete original-evidence implementation.
What to compare in a quote
What should a PEX6 replacement-engine quote include?
The written quote should identify the proposed engine and state condition, used-engine mileage where applicable, price, warranty, delivery, fitting if requested, expected timing and supplier identity/details. Where relevant, clarify included mild-hybrid/electrical components and commissioning scope.
Relevant suppliers can send competing quotes by email and SMS/WhatsApp after an enquiry. Availability is confirmed after the enquiry rather than displayed as real-time stock, and MazdaReplacementEngines.co.uk does not charge customers for its quote-comparison service.
PEX6 engine FAQs
What is PEX6?
PEX6 is an engine identifier that should be verified against the individual vehicle. Do not use the identifier alone as proof of capacity, output or compatibility.
Is PEX6 definitely a 2.0 e-SKYACTIV-G 150 engine?
The live page describes it that way, but the reviewed Mazda manufacturer sources establish SKYACTIV-G 2.0 and M Hybrid context rather than the exact PEX6-to-150 mapping. Verify an authoritative code/application record before treating that relationship as confirmed.
Can I buy a tested used PEX6 engine?
Where a correctly matched unit is available, compare exact identity, disclosed mileage, provenance, testing/condition evidence, included components and supplier warranty.
Can I get a reconditioned PEX6 engine?
Where a matching option is available, compare documented work, replaced parts, inspections or measurements, test results, included hardware and supplier warranty.
Can I request PEX6 supply and fit?
Yes, where a suitable matched unit and workshop route are available. The quote should define installation, relevant coding/adaptation, commissioning, road testing and warranty.
How much does a PEX6 replacement engine cost?
There is no reliable single price because cost depends on exact identity, condition, used mileage where applicable, availability, included components, delivery and fitting requirements.
Does a warning light mean the engine needs replacing?
Not automatically. Electrical, sensor, ignition, fuelling or other faults can create serious symptoms without proving complete internal engine failure.
Can I order a PEX6 engine using my registration alone?
The registration is the vehicle-level starting point, but physical engine identification and relevant mild-hybrid/control specification should also be checked before compatibility is accepted.
Reviewed Mazda engine guidance
Reviewed by the MazdaReplacementEngines.co.uk technical content team. Last updated: 16 September 2026.
About this service
Entity statement
MazdaReplacementEngines.co.uk is an independent UK replacement-engine comparison service for Mazda owners and workshops and is not affiliated with Mazda Motor Corporation.
Scope
Audit rule
PASS items remain unchanged. The listed FIX items are addressed below; PEX6 identity/output/application must be verified before index release.
Depth
Top Summary / Key Takeaway
Short answer / Key takeaway: This guide is for UK Mazda owners, workshop mechanics and engine buyers investigating a PEX6 reference, e-Skyactiv-G problems or replacement options. Mazda documents relevant 2.0-litre SKYACTIV-G petrol and M Hybrid specifications, but the reviewed sources do not prove the exact PEX6 or 150-output mapping, so confirm the registration, physical engine identity and control configuration before ordering. Then compare tested used, reconditioned or supply-and-fit quotes by evidence, included hardware, warranty and fitting scope.
Depth/topical coverage verdict
Replace the thin ~196-word body with the corrected sections above. This adds useful definition, source-backed context, compatibility, diagnosis, decision support, verification, genuine evidence guidance, quote criteria and 10 FAQs without changing any audit item already marked PASS.
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