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ECU diagnostics
Engine light on? Find the real cause first.
A fault code only says where the car noticed a problem. Our qualified technicians test properly, so you only pay for the fix you actually need.
Why a code reader isn't enough
Most garages plug in, read the code and replace the part it names. Often that part was fine, and the light comes back. The code is a clue, not an answer. We test the part, its wiring signal and the live engine data to find what really caused it. Done the right way, proper diagnostics usually saves you money.
Signs to look out for
- Engine management light on or flashing
- Car feels down on power or goes into limp mode
- Rough running, misfires or hesitation
- Warning messages on the dashboard screen
- A garage has already replaced parts and the light came back
If the light is steady, it is usually fine to drive gently to get it checked. If it is flashing, or the car loses power, pull over safely and call us.
What usually causes it
- SensorsAir flow, pressure and temperature sensors giving bad readings.
- Boost and air leaksSplit pipes and loose joints, which we find with a smoke test.
- EGR, DPF and AdBlueEmissions parts that are blocked or failing.
- SoftwareErrors or bad adaptations inside the engine ECU.
Find the cause first
How we fix it
- Read every engine codeCurrent and stored codes, plus when they happened.
- Test and watch live dataSensor readings, fuel trims and boost, plus smoke testing for leaks.
- Explain and price itWhat is wrong and what it costs. You decide before we start.
Your options
Recommended
Book us
Bring it to our HQ at Mallory Park. You get a price before any work starts.
Book a check →Fix it yourself?
Best left to us
Finding the root cause needs dealer-level tools and hands-on tests, so this is one for our technicians.
Common questions
How much does a diagnostic check cost?
Call us for a price for your car. You always get a price before any repair work.
Can't I just use a cheap code reader?
A code reader tells you which system has a problem. It doesn't tell you which part has failed or why. That is why parts often get replaced for nothing.
Where do I bring the car?
To our HQ at Unit 3, Mallory Park Circuit, Leicester LE9 7QE. It's an easy drive from Leicester, Coventry and Nottingham.
Do you work on all makes?
Yes, cars and vans of all makes, petrol and diesel. We work on the engine ECU and the systems it controls.