The short version: define the question, preserve the history and record what the vehicle can actually prove.
Start with the repair record
We review the reported original fault, diagnostic records, authorised work, fitted parts and the business’s stated outcome. Without that history, an inspection can record the present condition but may not be able to compare it fairly with what existed before.
Test the current complaint
Checks are chosen around the symptoms and system involved. They may include a full vehicle scan, code status and freeze-frame review, live data, electrical tests, actuator tests, physical examination and a road test where appropriate.
Separate resolved from outstanding
A useful comparison identifies evidence that has changed, faults that remain, new findings and matters that cannot be concluded from the available information. It does not label every stored historic code as an active defect.
Plan the sensible next step
The result may support further diagnosis, a return to the original repairer, a different repair route or no immediate intervention. Any repair quotation is separate from the independent findings.
Common questions
Before you arrange an inspection
Can you prove a previous garage fitted the wrong part?
Only if the accessible evidence supports that conclusion. We do not infer workmanship or responsibility from a fault code alone.
Should the original garage inspect the vehicle again first?
Often it is sensible to give the repairer an opportunity to examine the reported problem. Get consumer or legal guidance where a dispute is already developing.
Can you compare two diagnostic reports?
Yes. We can compare recorded systems, code status and available test evidence, while explaining differences in scan coverage, timing and vehicle condition.
Independent guidance
For consumer rights or dispute procedure, use the appropriate independent service:
The Motor Ombudsman: independent technical reportsCitizens Advice: problems with car repairs