Find The Fault.
Fix It Right.
Advanced vehicle diagnostics and auto-electrical investigation in Rugby. We investigate complex faults, including referrals from other garages, and explain the evidence before recommending repairs.
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.
Learn more →Mechanical Investigation
Physical testing, inspection and strip-down work to confirm mechanical faults before any repair is recommended.
Learn more →Servicing & Repairs
Full mechanical servicing, brakes, suspension, cooling, driveline and engine work — carried out properly with the right parts.
Learn more →MOT Testing
MOT testing for Class 1–4 and Class 7 vehicles. Clear explanations of results and sensible advice on any repairs needed.
Learn more →Expert Witness Reports
Document-only technical reports and CPR Part 35 expert reports for mechanical and electrical vehicle disputes, finance complaints and court proceedings.
Learn more →Beyond
Main Dealer
Level.
Evidence Before Repairs
We don't swap parts hoping something fixes it. Every recommendation is based on evidence from testing — not assumptions or shortcuts.
Specialist Equipment
Autel MaxiSys, Launch and Pico oscilloscopes, plus manufacturer-level system access for JLR, VW/Audi, Peugeot/Citroën, Fiat and more. Equipment and information access are chosen to suit the vehicle and the investigation.
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.
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.
OEM-level diagnostic platforms.
The same kit main dealers use — and beyond.
4.9 Stars · 72 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."
"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."
"Thank you Jeremy and Tom for carrying out a diagnostic test on my car today. Excellent customer service and advice."
"Been treated very professionally again by Jez and all the friendly guys at Autodiag. Wouldn't go anywhere else."
"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."
"Service and MOT completed with no major issues identified. One minor issue corrected and fully explained. Very happy with the work and overall experience."
"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."
"I did not know this place existed. Contacted Jez about my Peugeot — he was fully booked but managed to squeeze me in. Absolutely outstanding."
"Service was fantastic, very straightforward and helpful."
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.
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.
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."
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 carried out with care.
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.
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.
- → 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