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The two largest blank spots in the reference are closed: 46 codes that had neither an article nor a guide now lead to a walkthrough.

Fuel use, cold starts, unstable idle, freeze frames, accepting a repair — and checking the adapter itself.

Forty-seven parameters used to be one flat list. Now there are eight groups — and the search understands their names.

Catalyst, thermostat, EGR and a code that comes back after a reset. Until now a guide could only be found in its own section.

Pages are built in 6 milliseconds instead of 25. The site used to share a machine with unrelated software; now it has one to itself.

Heavy steering, a cold heater, AdBlue and start-stop. We added what people search for in words rather than by code.

Some codes used to carry a single line of definition. Now every one says what to check first, and why the part is not the first move.

27 codes that used to carry a single line of definition. Most of the new text went where the name frightens people most.

Thirty-nine new write-ups in two batches: sensor circuits, coils, injectors, the fuel pump, boost. In the app and on the site alike.