Vi kontrollerer hvorvidt adgangskoden virker eller ikke.

Hvorvidt means whether.

So hvorvidt adgangskoden virker means whether the password works.

A useful thing to know is that hvorvidt is a bit more formal or written-sounding than om, which is very common in everyday Norwegian. In many situations, these are both possible:

• Vi kontrollerer hvorvidt adgangskoden virker.
• Vi kontrollerer om adgangskoden virker.

Both mean basically the same thing.

Yes — hvorvidt by itself already means whether, so eller ikke is not strictly necessary.

• hvorvidt adgangskoden virker = whether the password works
• hvorvidt adgangskoden virker eller ikke = whether the password works or not

Adding eller ikke makes the two possibilities more explicit. It is very similar to English whether ... or not.

So:

• Vi kontrollerer hvorvidt adgangskoden virker.
• Vi kontrollerer hvorvidt adgangskoden virker eller ikke.

Both are correct. The second one is just more explicit.

Because after hvorvidt, Norwegian uses subordinate clause word order.

In a direct question, you would say:

• Virker adgangskoden? = Does the password work?

But in an indirect question introduced by hvorvidt or om, the word order becomes more like a normal statement:

• ... hvorvidt adgangskoden virker
• ... om adgangskoden virker

So:

• direct question: Virker adgangskoden?
• indirect question: Vi kontrollerer hvorvidt adgangskoden virker.

This is a very common pattern in Norwegian.

Adgangskoden is the definite singular form of adgangskode.

• en adgangskode = an access code / a password
• adgangskoden = the access code / the password

The ending -en is the usual definite ending for many masculine nouns in Bokmål.

So the sentence is talking about a specific password or access code, not just any password in general.

It can be, but it depends on context.

Adgangskode literally means something like access code. In many contexts, especially technical or formal ones, it can refer to a password, code, or login code.

But very often, native speakers would also use:

• passord = password

So you may also hear:

• Vi kontrollerer om passordet virker.

That would sound very natural too. Adgangskode can feel a bit more formal, technical, or broad than passord.

Here virker means works or functions.

It is the present tense of å virke.

• Passordet virker. = The password works.

Be careful, because å virke can also mean seem / appear in other contexts:

• Det virker rart. = It seems strange.

But in this sentence, the meaning is clearly function correctly.

Kontrollerer is the present tense of å kontrollere = to check / to verify / to control.

So:

• å kontrollere = infinitive
• kontrollerer = present tense

In this sentence:

• Vi kontrollerer ... = We check / We are checking ...

Like English, Norwegian present tense can be used for:

• something happening now
• a routine action
• a general process

Depending on context, Vi kontrollerer ... could mean either We are checking ... or We check ....

Yes — that would be very natural, and probably more common in everyday speech.

Compare:

• Vi kontrollerer hvorvidt adgangskoden virker eller ikke.
  More formal, technical, or written.

• Vi sjekker om adgangskoden virker.
  More everyday and conversational.

So if you are speaking casually, sjekker and om are often the more natural choices.

Because that would mean something slightly different.

• hvorvidt adgangskoden virker eller ikke = whether the password works or not
  This is neutral and considers both possibilities.

• hvorvidt adgangskoden ikke virker = whether the password does not work
  This focuses specifically on the negative possibility.

So the original sentence is broader and more balanced. It is asking about the result either way, not only about failure.

Yes, it is correct and natural, especially in a formal, technical, or written context.

That said, many native speakers in everyday speech would probably choose a simpler version, such as:

• Vi sjekker om adgangskoden virker.
• Vi kontrollerer om adgangskoden virker.

So the original sentence is good Norwegian, but it sounds a little more formal than the most casual everyday phrasing.