Fejlkoden står i brugsanvisningen.

Because -en is the definite article attached to the end of the noun.

• en fejlkode = an error code
• fejlkoden = the error code

In Danish, the definite article usually comes at the end of the noun rather than as a separate word like the in English.

For the same reason: Danish often marks definiteness by adding an ending to the noun.

• en brugsanvisning = a user manual / instruction manual
• brugsanvisningen = the user manual / the instructions

So i brugsanvisningen means in the user manual.

You can use den + adjective + noun in some cases, such as:

• den gamle brugsanvisning = the old manual

But with no adjective, Danish normally just uses the suffixed definite form:

• brugsanvisningen

Yes, står literally means stands, but in Danish it is often used in places where English would say is written, says, or appears.

So in this sentence:

• Fejlkoden står i brugsanvisningen

the idea is:

• The error code is listed in the manual
• The error code is written in the manual

This is very natural in Danish. Danish often uses physical-position verbs like stå and ligge in broader ways than English does.

This is the normal Danish word order for a simple main clause:

subject + verb + other information

So here:

• Fejlkoden = subject
• står = verb
• i brugsanvisningen = prepositional phrase

That makes the structure very straightforward:

• The error code
  • is/stands
    • in the manual

Yes, that is also correct.

Danish is a V2 language, which means the finite verb usually comes in the second position in main clauses. If you move another element to the front, the verb still stays second:

• Fejlkoden står i brugsanvisningen
• I brugsanvisningen står fejlkoden

Both are grammatical, but the emphasis changes slightly.

• Fejlkoden står i brugsanvisningen = neutral
• I brugsanvisningen står fejlkoden = emphasizes in the manual

I is a preposition, and here it means in.

So:

• i brugsanvisningen = in the manual

This is one of the most common Danish prepositions.

Exactly. Danish often combines nouns into a single compound word.

Here:

• brug = use
• anvisning = instruction / directions

Together:

• brugsanvisning = instruction manual / user guide

Then the definite ending is added:

• brugsanvisningen = the instruction manual

This is very typical in Danish, just like:

• togstation = train station
• arbejdsdag = workday

That s is a linking element often used in Danish compounds. It does not always correspond directly to meaning by itself; it helps connect the parts of the compound.

So:

• brug
  • anvisning → brugsanvisning

You will see this kind of linking s in many Danish compound words, though not in all of them.

Står is the present tense of stå.

• at stå = to stand
• står = stands / is standing / is written
• stod = stood
• har stået = has stood / has been written

In this sentence, the present tense gives a general fact:

• The error code is in the manual
• The error code is written in the manual

Its basic form is:

• en fejlkode = an error code

That means it is a common-gender noun, and the definite singular becomes:

• fejlkoden = the error code

If it were a neuter noun, it would use et in the indefinite form and typically -et in the definite singular.

Usually yes, in many contexts. Brugsanvisning often means:

• user manual
• instruction manual
• instructions

Depending on the context, English might translate it in slightly different ways. It is a practical guide telling you how to use something.

A rough guide for an English speaker might be:

• Fejlkoden ≈ file-koh-thn or file-koh-den
• står ≈ stohr
• i = ee
• brugsanvisningen ≈ brooks-an-veece-ning-en

But Danish pronunciation is quite reduced in real speech, so the actual sounds may be less clear-cut than the spelling suggests.

A few helpful points:

• ej often sounds somewhat like eye
• å sounds roughly like the vowel in more or saw, depending on accent
• final syllables are often weakly pronounced

Sometimes you might hear something like Fejlkoden er i brugsanvisningen, and it would be understandable, but står is more natural if the idea is that the code is written/listed there.

So:

• står = sounds more idiomatic for written information
• er = more neutral, but less specific

Danish often prefers stå when referring to text appearing in a written source.

By itself, the sentence only says that the error code is in the manual. It does not automatically say whether that means:

• the code number is listed there
• the meaning of the code is explained there
• both

That depends on the broader context. The sentence simply tells you that the relevant information can be found in the manual.