Databehandleren oppdaget feilsendingen i går.

Because -en is the usual definite singular ending for many common-gender nouns in Norwegian Bokmål.

• databehandler = a data processor / the person or company processing data
• databehandleren = the data processor

And:

• feilsending = an incorrect sending / misdirected transmission
• feilsendingen = the incorrect sending / the misdirected transmission

Unlike English, Norwegian often puts definiteness at the end of the noun instead of using a separate word like the.

The base form is databehandler.

This is a compound noun:

• data = data
• behandler = handler, processor, someone/something that deals with something

So databehandler literally means something like data handler/processor. In legal or technical contexts, it can also mean a data processor in the GDPR sense.

With the definite ending:

• databehandler = a data processor
• databehandleren = the data processor

It is also a compound noun:

• feil = error, wrong
• sending = sending, transmission, dispatch

So feilsending literally means something like wrong sending, erroneous transmission, or misdirected sending.

Then:

• feilsending = an erroneous/misdirected sending
• feilsendingen = the erroneous/misdirected sending

Compound nouns are extremely common in Norwegian, just as in English, but Norwegian usually writes them as one word.

Oppdaget is the past tense of oppdage, which means to discover, to notice, or to detect.

• å oppdage = to discover / detect
• oppdaget = discovered / detected

In this sentence, it tells you that the action happened in the past:

• Databehandleren oppdaget feilsendingen i går.
• The data processor discovered the misdirected transmission yesterday.

A useful thing for English speakers: Norwegian verbs do not change for person.

So:

• jeg oppdaget
• du oppdaget
• han/hun oppdaget
• vi oppdaget

All use the same past-tense form.

Here it is the past tense finite verb.

That matters because oppdaget can also be a past participle in other contexts. But in this sentence, it is the main verb in a normal past-tense statement.

You can tell because of the structure:

• Databehandleren = subject
• oppdaget = finite verb
• feilsendingen = object
• i går = time expression

If it were a participle, you would usually expect an auxiliary verb, such as:

• har oppdaget = has discovered
• ble oppdaget = was discovered

Because Norwegian main clauses normally follow the V2 rule: the finite verb comes in the second position.

In this sentence:

1. Databehandleren = first element
2. oppdaget = second element

So the structure is completely normal.

This is similar to English in many basic sentences, but Norwegian keeps this rule even when something else comes first. For example:

• I går oppdaget databehandleren feilsendingen.
• Yesterday, the data processor discovered the misdirected transmission.

Notice that when I går comes first, the verb oppdaget still stays in second position, and the subject moves after it.

I går means yesterday, and here it is a time adverbial.

Putting it at the end is very natural in Norwegian:

• Databehandleren oppdaget feilsendingen i går.

This is a neutral word order: subject + verb + object + time expression.

But Norwegian also allows fronting for emphasis or style:

• I går oppdaget databehandleren feilsendingen.

That version emphasizes yesterday a bit more, or simply uses it as the topic of the sentence.

No, not in a normal main clause.

Because of the V2 rule, if I går comes first, the finite verb must come immediately after it:

• I går oppdaget databehandleren feilsendingen. ✅

Not:

• I går databehandleren oppdaget feilsendingen. ❌

This is one of the most important word-order differences between English and Norwegian.

Mostly from word order, not from case endings.

In this sentence:

• Databehandleren comes before the verb, so it is the subject
• feilsendingen comes after the verb, so it is the object

Norwegian generally does not mark nouns for case the way German does. That means sentence position is very important.

So:

• Databehandleren oppdaget feilsendingen
  = The data processor discovered the misdirected transmission

If you switched them around, you would change the meaning:

• Feilsendingen oppdaget databehandleren
  This is grammatically possible in a marked structure, but because of Norwegian word order rules it would usually imply a different emphasis, and in many contexts it may sound odd or literary.

For a learner, the safest interpretation is:

• first noun phrase before the finite verb = usually the subject
• noun phrase after the verb = often the object

Yes. Then you would remove the definite -en endings and usually add en before the nouns:

• En databehandler oppdaget en feilsending i går.

That means:

• A data processor discovered an erroneous transmission yesterday.

Compare:

• databehandleren = the data processor
• en databehandler = a data processor

and:

• feilsendingen = the misdirected transmission
• en feilsending = a misdirected transmission

So the original sentence is talking about specific, identifiable things.

Because i går is a fixed expression meaning yesterday, and in standard Bokmål it is written as two words:

• i = in
• går = originally related to yesterday/day before today in this expression

Even though English uses one word, Norwegian uses the set phrase i går.

So:

• i dag = today
• i morgen = tomorrow
• i går = yesterday

These are worth learning as whole expressions.

The present tense of oppdage is oppdager.

So the sentence becomes:

• Databehandleren oppdager feilsendingen i dag.

If you only change the verb but keep i går, it would sound inconsistent, because present tense and yesterday usually do not go together in an ordinary statement.

Compare:

• oppdaget = discovered
• oppdager = discovers / is discovering

A natural spoken grouping would often be:

• Databehandleren | oppdaget feilsendingen | i går.

That is:

1. subject
2. verb + object
3. time expression

The stress often falls on the most informative words, especially oppdaget, feilsendingen, or går, depending on context.

If someone is correcting the time, they may stress går:

• Databehandleren oppdaget feilsendingen i GÅR.

If they are contrasting what was discovered, they may stress feilsendingen:

• Databehandleren oppdaget FEILSENDINGEN i går.

So the sentence is grammatically simple, but intonation can still shift the emphasis.