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Network and communication
No open-source descriptions exist for this system, so its codes are read from their structure.
Standardised (SAE/ISO). Standardised meaning, consistent across manufacturers.
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Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.