auslesen
to finish reading
To read a book or text completely from beginning to end.
Ich habe den Roman an nur einem Wochenende ausgelesen.
I finished reading the novel in just one weekend.

to finish reading / read out / select
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to finish reading
To read a book or text completely from beginning to end.
Ich habe den Roman an nur einem Wochenende ausgelesen.
I finished reading the novel in just one weekend.

'Auslesen' is a separable verb. In a main clause, the prefix 'aus-' goes at the end. The prefix often emphasizes an action that is brought to an end or something that is extracted from a group.
Er liest gerade den letzten Band seiner Lieblingsserie aus.
He is just finishing the last volume of his favorite series.
In this meaning, the object is always a text. Typical objects are 'ein Buch' (a book), 'einen Roman' (a novel), 'einen Artikel' (an article), or 'eine Zeitschrift' (a magazine).
Hast du die Zeitung schon ausgelesen?
Have you finished reading the newspaper yet?
When it is about technology, the object is a data storage medium. You read out 'Daten' (data), 'einen Chip' (a chip), 'eine Speicherkarte' (a memory card), or 'den Fehlerspeicher' (the fault memory) of a device.
Die Werkstatt muss die Daten aus dem Motorsteuergerät auslesen.
The repair shop has to read out the data from the engine control unit.
In the meaning 'auswählen' (to select), the verb refers to sorting physical things by quality. Typical objects are 'Trauben' (grapes), 'Früchte' (fruit), 'Kaffeebohnen' (coffee beans), or also 'Bewerbungen' (applications).
Die besten Kaffeebohnen werden für den Export von Hand ausgelesen.
The best coffee beans are selected by hand for export.
to read
'lesen' and 'auslesen' can both have to do with texts or information. 'lesen' is the normal, general word for texts and also for some kinds of information. With texts, 'auslesen' means to read something completely to the end; in everyday language, however, people often say 'zu Ende lesen' (to finish reading) or 'durchlesen' (to read through) more naturally. 'auslesen' is very typical in technology: you read out data from a device, memory, or sensor. The words can be confused because both have to do with information. For normal texts, 'lesen' usually fits; for technical data, 'auslesen' often does.

In der Werkstatt liest der Mechaniker die Daten aus dem Auto aus.
At the workshop, the mechanic reads out the data from the car.
Zur Vorbereitung auf den Umzug liest er einen Artikel über neue Mietverträge.
To prepare for the move, he is reading an article about new rental contracts.