Warning light on?
Let's find out
exactly why.
A full ECU diagnostic scan, at your driveway or depot across South & West Wales — pinpointing the real cause of a fault before anyone recommends spending money on parts.
What a proper diagnostic scan actually involves
A warning light rarely tells the whole story on its own. We connect directly to your ECU and every other module on the network — engine, transmission, ABS, airbag and more — to see exactly what each one is reporting.
Fault codes are only the starting point. We interpret live data, freeze-frame conditions and fault history to work out the actual root cause, not just clear the code and hope it doesn't come back.
You get a clear, honest explanation of what's wrong and what it'll take to fix it — before anyone spends a penny on parts.
Every warning light means something different
Engine Management Light
The most common warning light — could mean anything from a loose fuel cap to a serious sensor or fuelling fault. We narrow it down properly.
AdBlue / DPF / EGR Warnings
Common on modern diesels. We diagnose the actual cause rather than just clearing the code — see our dedicated pages for each.
ABS / Traction Control
Wheel speed sensors, hydraulic faults or wiring issues — diagnosed properly before anything's replaced unnecessarily.
Airbag / SRS Light
Never something to ignore. We identify exactly which sensor or circuit is at fault so it can be put right with confidence.
Battery / Charging Faults
Intermittent electrical faults, charging issues and parasitic drains tracked down at the source.
Limp Mode / Power Loss
Sudden loss of power or a car stuck in limp mode diagnosed to find the real trigger, not just a temporary reset.
Four steps to a straight answer
Book Your Slot
Tell us the symptoms or warning light and we'll get a diagnostic visit booked in quickly.
We Come To You
Home, work or depot — anywhere across South & West Wales, no towing to a garage.
Full System Scan
Every module checked, live data reviewed, and the real root cause identified — not just a code cleared.
Honest Report
A clear explanation of what's wrong and what it'll take to fix it — no guesswork, no pressure.
Book a DiagnosticDiagnosed a specific fault? We can usually fix it in the same visit
AdBlue Solutions
Persistent AdBlue faults and dosing errors resolved.
DPF Solutions
Blocked filters and failed regenerations diagnosed and resolved.
EGR Solutions
Sticking or faulty EGR valves diagnosed and resolved at the source.
Immobiliser Solutions
Immobiliser faults diagnosed and reset, getting you back on the road.
Lambda / O2 Sensor
Faulty oxygen sensor faults diagnosed for smoother running and accurate fuelling.
Key Coding
Lost, spare or replacement keys coded to your vehicle on-site.
Mileage Correction
Recalibrating displayed mileage after a cluster, ECU or gearbox replacement.
Performance & Economy Tuning
Once your fault's sorted, ask us about getting more from the car — power or mpg.
We diagnose properly, so you don't pay for guesswork.
Too many diagnostic visits end with a part swapped that didn't fix anything. We interpret the full picture — live data, fault history and freeze-frame conditions — before recommending any work at all.
Genuinely Mobile
We bring the full diagnostic kit to your driveway or depot — no towing or waiting for a garage slot.
All Makes & Models
Manufacturer-level diagnostic access across the vast majority of cars, vans and commercial vehicles.
Straight-Talking Reports
A plain-English explanation of what's actually wrong — not a code number and a shrug.
Fixed On The Spot, Where Possible
Many faults we diagnose — AdBlue, DPF, EGR, sensors, immobiliser issues — can be resolved in the same visit.
From drivers who wanted a straight answer
"Garage wanted to swap three sensors on a guess. WCH found the actual fault in twenty minutes and it was one part."
"Explained exactly what each fault code meant and what was and wasn't urgent. No pressure, just honesty."
"Diagnosed and fixed an EGR fault in the same visit. Didn't need to book anywhere else or wait a week."
Mobile across South & West Wales
If you're within reach of these areas, we'll come to you. Based further afield? Get in touch — we regularly travel beyond our core patch for the right job.
