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Rugby's Specialist Diagnostic Workshop

Find The Fault.
Fix It Right.

Advanced vehicle diagnostics and auto-electrical investigation. We work at — and beyond — main dealer level. When other garages can't find it, we do.

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4.8★
59 Google Reviews
£95
Diagnostic from
RMI
Academy Trained
RMI Academy of Automotive Skills
Manufacturer-Level System Access
4.8 Stars · 59 Google Reviews
The Garage Other Garages Call
Honest · Reliable · No Sales Pressure
What We Do
Our Services

From pinpointing intermittent electrical faults to full mechanical repairs — every job starts with proper diagnosis, not guesswork.

Vehicle Diagnostics

Professional fault-finding using live data, oscilloscope analysis and system scanning. We find root causes — not just fault codes.

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Mechanical Investigation

Physical testing, inspection and strip-down work to confirm mechanical faults before any repair is recommended.

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Servicing & Repairs

Full mechanical servicing, brakes, suspension, cooling, driveline and engine work — carried out properly with the right parts.

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MOT Testing

MOT testing for Class 1–4 and Class 7 vehicles. Clear explanations of results and sensible advice on any repairs needed.

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Expert Witness Reports

CPR Part 35 compliant independent technical reports for vehicle disputes. Small claims, FOS, and county court proceedings.

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Why Autodiag
Beyond
Main Dealer
Level.
01

Root Cause Every Time

We don't swap parts hoping something fixes it. Every recommendation is based on evidence from testing — not assumptions or shortcuts.

02

Specialist Equipment

Autel MaxiSys, Launch and Pico oscilloscopes, plus manufacturer-level system access for JLR, VW/Audi, Peugeot/Citroën, Fiat and more. The same capability as a main dealer — without the rates.

03

Clear Communication

Written findings after every session. You'll always know exactly what was found, what was tested, and what the options are — in plain English.

04

The Garage Other Garages Call

When trade garages hit a wall — electrical faults they can't trace, modules they can't programme, intermittent issues they can't replicate — they call us. We're the specialist behind the specialist.

£95
Diagnostic from + VAT
Verified Google Reviews
4.8 Stars · 59 Reviews
4.8
★★★★★
59 Google Reviews
Google
Read All 59 Reviews →
★★★★★

"Been using Autodiag for about 6 years now, always excellent service. Couldn't ask any more of them. Thanks for all your help Jez."

Adrian · Google Review
★★★★★

"Great service by Jez and the team to identify some electrical issues I was having with my T6. Squeezed me in at short notice and has been more than helpful since."

Simon Cort · Google Review
★★★★★

"Thank you Jeremy and Tom for carrying out a diagnostic test on my car today. Excellent customer service and advice."

Frances McGuire · Google Review
★★★★★

"Been treated very professionally again by Jez and all the friendly guys at Autodiag. Wouldn't go anywhere else."

Alex Henderson · Google Review
★★★★★

"Really good experience after having problems with lots of warning lights due to the ABS system on my car. Jez sorted it clearly and efficiently."

Rachael Griffin · Google Review
★★★★★

"Service and MOT completed with no major issues identified. One minor issue corrected and fully explained. Very happy with the work and overall experience."

Daniel McGuigan · Google Review
★★★★★

"First time for me and grateful they were able to fit me in at short notice. Friendly bunch of lads. A lucky find for me."

Kevin Abberley · Google Review
★★★★★

"I did not know this place existed. Contacted Jez about my Peugeot — he was fully booked but managed to squeeze me in. Absolutely outstanding."

Tony Rea · Google Review
★★★★★

"Service was fantastic, very straightforward and helpful."

Gig Bath · Google Review
See All 59 Reviews on Google →
Transparent Pricing
No Surprises

Fixed fees for diagnostic sessions. You know the maximum cost before we start — and we never carry out additional chargeable work without discussing it first.

Diagnostics
£95
+ VAT · up to 1 hour
Warning lights, electrical faults and fault code investigation. Includes system scan and assessment.
Extended Diagnostics
£180
+ VAT · up to 2 hours
Intermittent or complex faults requiring deeper investigation, wiring analysis and oscilloscope testing.
Mechanical Investigation
£95
+ VAT · per session
Physical inspection or partial strip-down to confirm the cause of a mechanical problem.
Labour Rate
£95
+ VAT · per hour
Servicing and repair work. Estimates provided before work begins wherever possible.
Full Pricing Details →
Who We Work With
The Right Choice When

Fault Won't Go Away

Warning lights keep returning after repairs elsewhere, or the same issue keeps coming back.

Intermittent Fault

The fault doesn't show up consistently — we're equipped to investigate with data logging and oscilloscope analysis.

Electrical Suspected

Battery drain, unusual electrical behaviour, module issues or wiring faults — this is our speciality.

Warranty Reports

We don't deal with warranty companies directly. We produce a full, honest diagnostic report and written estimate — you submit the claim yourself. Our reports are detailed, accurate and built to support your case.

Trade Referral

Other garages refer their most complex faults to us. We're the garage that other garages call — for electrical faults, module issues and anything they can't resolve themselves.

Need Clarity

You've been told diagnosis is required. We give you clear, honest answers based on testing — not assumptions.

Our Approach
We're Not Salespeople.

We're a garage and a business — but we are not sales-driven. We won't upsell you work you don't need, recommend parts on a hunch, or push you into decisions before you're ready.

We take time to explain what we've found, why it matters, and what your options are — in plain language, without pressure. You leave understanding your vehicle better than when you arrived.

Our reputation is built on honesty, reliability and telling the truth — even when the truth is "you don't need to spend anything right now."

Honest Diagnosis
We only recommend work that testing confirms is necessary. No guesswork, no fishing for faults.
Clear Explanations
We explain everything in plain language — what we found, what it means, what we'd recommend and why.
You Stay in Control
No work is carried out without your agreement. You decide what happens next — always.
Jeremy Vinnicombe — Autodiag
Jeremy Vinnicombe
Founder & Principal Technician
Who You're Dealing With
28 Years. One Standard.

I started in automotive diagnostics in 1998. Since then I've worked across independent workshops, fleet environments and specialist vehicles — and I've been running Autodiag in Rugby since it launched. Every job that comes through this workshop gets the same treatment: properly diagnosed before anything is recommended, clearly explained before anything is approved, and done right the first time.

RMI Academy trained. Manufacturer-level system access. Motor trade insured. VAT registered. And the garage that other garages call when they're stuck.

Ready to Get a Clear Answer?

Call us, email us, or use the contact form — we're happy to advise before you book.

Book a Diagnostic 01788 877660
Out of Hours & Breakdown Drop-Off
For emergencies, out-of-hours situations or breakdown recoveries

If you need to drop a vehicle outside of opening hours — or your vehicle is being delivered by a breakdown or recovery company — you are welcome to leave it in our car park.

Please ensure the vehicle is parked sensibly and safely so as not to obstruct other vehicles or the workshop entrance.

Important: Vehicles left out of hours are not insured by us until we have acknowledged receipt. Please email us immediately after drop-off with your name, contact number, vehicle registration and a brief description of the issue.

Out of Hours Email
[email protected]
Monitored for emergency and out-of-hours drop-offs
Drop-Off Checklist
  • → Park safely — do not block the entrance
  • → Leave keys in a safe place or with recovery driver
  • → Email us straight away with your details
  • → We will acknowledge receipt and make contact