Fault Diagnostics
Pinpoint the problem. Fix it fast.
Modern cars are controlled by dozens of computers. When something goes wrong, you need the right tools and expertise to find the root cause quickly. Our diagnostic service goes far beyond a simple code read.
At Wallace Performance, our fault diagnostics service uses professional-grade scanning equipment to communicate directly with your vehicle's ECU and control modules. We do not just clear warning lights — we trace the fault to its source, explain what it means, and recommend the right fix. Whether it is an engine management light, ABS warning, airbag fault, or a mysterious drivability issue, we have the experience and the kit to solve it. Our technicians are trained on all major manufacturer systems and stay up to date with the latest software releases.
What's Included
OBD-II and manufacturer-specific fault code reading
Live data stream monitoring and graphing
Component activation testing and bi-directional control
ABS, ESP, airbag, and SRS module diagnostics
DPF regeneration and soot load analysis
Injector balance and cylinder contribution tests
Pre-MOT full systems diagnostic health check
Clear fault reporting with recommended actions
Our Process
Initial Consultation
Tell us what symptoms you are experiencing. We note warning lights, sounds, performance changes, and recent history.
Full Systems Scan
We connect our diagnostic scanner and read fault codes from all control modules — engine, transmission, ABS, airbag, and more.
Live Data Analysis
We monitor real-time sensor data while the engine runs to catch intermittent faults that codes alone miss.
Component Testing
Where needed, we perform individual component tests and electrical checks to confirm the root cause.
Report and Quote
You receive a clear written report with fault codes, our findings, and a transparent quote for any required repairs.
Pricing
All prices are starting from and may vary based on your specific vehicle and requirements. Contact us for a personalised quote.
Ready to Book?
Get in touch today and we will get you booked in for yourfault diagnostics. Free estimates and advice.
Related Services
ECU Remaps
Most engines are deliberately detuned from the factory. Our custom ECU remapping safely releases that hidden power and improves the way your car drives.
Rolling Road
Our chassis dynamometer gives you real, measurable power and torque data. No guesswork. No inflated claims. Just honest figures you can trust.
Four Wheel Alignment
Incorrect alignment is the silent killer of tyres and handling. Our full four-wheel alignment service restores your car's geometry to factory or custom spec.
What Our Customers Say
Real feedback from real drivers who trust Wallace Performance with their cars.
"Wallace Performance remapped my Astra and the difference is night and day. Throttle response is instant, power delivery is smooth, and the car pulls hard right to the redline. They even did a before-and-after dyno run so I could see the numbers. Honest, professional, and seriously know their stuff."
Sarah Jenkins
Vauxhall Astra VXR Owner — ECU Remaps
"I brought my M3 in for a full geometry setup before a track day. The laser alignment was incredibly precise and the car felt completely different on the road — sharper turn-in, more stable under braking, and tyre wear has been perfectly even since. Worth every penny."
Michael Davies
BMW M3 Competition Owner — Laser Wheel Alignment
"Had a custom exhaust built for my ST and it sounds absolutely perfect. Not too loud on the motorway, but when you put your foot down it turns heads. The fabrication quality is top notch — TIG welds are beautiful and it fits like a glove. Wallace Performance is now my go-to garage."
James O'Connor
Ford Focus ST Owner — Custom Exhaust Systems
"My TT had a persistent check engine light that two other garages could not figure out. Wallace Performance diagnosed it in under an hour — a faulty coil pack and a dodgy sensor. They fixed it same day and the car has been faultless since. Proper diagnostics, not guesswork."
Emma Richardson
Audi TT Owner — Fault Diagnostics
"Rolling road session was brilliant. The dyno graph showed exactly where my power was dropping off and the team explained everything in plain English. We tweaked the boost and fuelling on the spot and gained 23bhp. You can't argue with printed proof."
Tom Bradley
Subaru WRX STI Owner — Rolling Road
"After lowering my Golf, the handling felt vague and my tyres were wearing unevenly. The four-wheel alignment sorted it completely. They set custom geometry for my coilovers and gave me a before-and-after printout. Car drives like it is on rails now."
Rebecca Holt
VW Golf GTI Owner — Four Wheel Alignment