Vehicle Diagnostics
Wirral & Liverpool
Professional OBD-II diagnostic scanning for all makes and models. Engine management, ABS, airbag, transmission & full electrical system fault code reading. Clear, honest advice — no jargon.
What We Diagnose
We scan every electronic system in your vehicle — not just the engine light. Our professional equipment reads all ECUs simultaneously.
Engine Management Light
Full scan of engine ECU fault codes — identify the exact cause of your engine warning light before it becomes a costly repair.
ABS & Brake System
Diagnose ABS warning lights, wheel speed sensor faults, and brake system electronic failures quickly and accurately.
Airbag & SRS Systems
Airbag warning light diagnosis. We read SRS fault codes and advise on safe, correct repairs — never guess with safety systems.
Transmission & Gearbox
Automatic and manual gearbox fault code reading. Identify slipping, harsh shifts, or warning lights before they cause major damage.
Electrical & Body Control
Full body control module (BCM) scan — windows, central locking, lighting, and other electrical gremlins traced to their source.
Full System Health Check
A complete multi-system scan of every ECU in your vehicle — the most thorough way to understand your car's overall health.
How It Works
Simple, transparent process — no hidden charges, no unnecessary work.
Book In
Call or message us to arrange a convenient time. Same-day slots often available.
Full Scan
We connect our professional diagnostic equipment and scan every ECU in your vehicle.
Clear Report
We explain exactly what the fault codes mean in plain English — no jargon.
Repair or Advise
We can carry out the repair or advise you on the best course of action.
Why Choose Neptune for Diagnostics?
Professional-grade multi-brand OBD-II diagnostic equipment
Japanese car specialists — Toyota, Honda, Nissan, Mazda, Subaru, Mitsubishi
Honest, plain-English fault reports — no unnecessary upselling
Fast turnaround — most diagnostic scans completed same day
We can carry out the repair too — no need to visit multiple garages
Conveniently located in Wirral — serving Liverpool & North Wales
Diagnostic Pricing
Single System Scan
e.g. engine light only
Full Multi-System Scan
All ECUs — recommended
Diagnostic + Report
Written fault report included
Japanese Car Specialist
All JDM makes & models
Areas We Cover
Vehicle diagnostics available across Wirral, Liverpool, and surrounding areas.
Frequently Asked Questions
How much does a vehicle diagnostic check cost?
Our diagnostic scan starts from £45. This covers a full OBD-II scan, fault code reading, and a plain-English explanation of any issues found.
What does a diagnostic check involve?
We connect professional diagnostic equipment to your car's OBD-II port and scan all electronic control units — engine, transmission, ABS, airbag, and body control. We read and interpret every stored or live fault code.
Can you diagnose all makes and models?
Yes. We use professional multi-brand diagnostic tools covering all common makes — Japanese cars (Toyota, Honda, Nissan, Mazda, Subaru, Mitsubishi), European, and most other manufacturers.
Do you specialise in Japanese cars?
Absolutely. Japanese vehicles are our speciality. We have deep experience with Toyota, Honda, Nissan, Mazda, Subaru, Mitsubishi, and older pre-2010 JDM models that generic garages often struggle with.
Will you clear the fault codes after diagnosis?
We always explain what codes mean before clearing anything. Codes are cleared after a confirmed repair — we never just wipe them and send you on your way.
Where are you based?
We are based in Wirral, Merseyside and cover Wirral, Liverpool, Birkenhead, Wallasey, Ellesmere Port, Chester, and parts of North Wales.
Warning Light On? Don't Ignore It.
A warning light can mean anything from a minor sensor fault to a serious mechanical issue. Get it scanned today — from just £45.