Tools can request and display different subsets of diagnostic information. A difference in the number of listed entries does not immediately establish that one ECU has gained or lost faults.

Interpreting the evidence

Compare the controller coverage, filters and status selection used by each tool. Keep the scan times and operating conditions consistent. Review complete fault entries rather than only the total shown at the top of the report.

Keep this evidence

Send both exported reports and the vehicle state during each scan.

A larger code count is not automatically a better diagnosis. Coverage and interpretation matter more than the headline number.

Speak to AXION

For CAN-bus and vehicle-network diagnostics, send your vehicle details and fault report. Workshop assessment is in Didcot, Oxfordshire. Suitable postal or remote work is confirmed before booking.

Technical background from National Instruments. The referenced design explains the principle; the vehicle-specific procedure determines the repair.