From warning light to a useful diagnosis
A diagnostic trouble code records a condition detected by a control module. It does not always identify the failed part. Symptoms, stored information, live data and relevant physical checks need to be considered together.
Tell us whether the problem is constant or intermittent, what the vehicle was doing when it appeared, and any recent repairs. Avoid clearing codes before an assessment unless there is a specific reason: useful information can be lost.
When to request diagnostic help
- Engine or system warning lights with an explanation of how the car drives.
- Starting, charging or electrical issues, including intermittent symptoms.
- Loss of performance, rough running or an unresolved fault after parts have been replaced.
- A vehicle health concern before considering ECU software changes.
What a mobile appointment can establish
Access depends on the vehicle, system and equipment compatibility. Some faults require an extended test, specialist procedure or workshop inspection. We discuss what can be checked and the next step; a code read cannot guarantee that every underlying fault will be identified in one visit.
If a repair is possible within the agreed scope, the proposed work and cost should be confirmed before it proceeds. Read about servicing and repair enquiries.
If the vehicle may be unsafe
If a warning indicates a serious fault, the vehicle behaves abnormally or braking and steering are affected, stop using it safely and seek advice rather than driving to test it. For an urgent electrical non-start, call our emergency electrical contact line.
Questions before you book
Will clearing the code fix the problem?
Clearing a code does not repair the cause. It can remove information useful for diagnosis, and the warning may return.
Can you diagnose any make and system?
Coverage varies with the make, model, year and system. Provide the registration and symptoms so compatibility can be checked.
Can diagnostics confirm a car is ready for remapping?
Diagnostic checks can identify faults to address first, but no scan proves every mechanical component is healthy. Suitability also depends on condition, maintenance and drivetrain limits.