Við athugum dekkjamynstrið og útblásturinn áður en bíllinn fer í endurskoðunina.

Athugum is the 1st person plural present tense of the verb að athuga (to check, inspect, examine).

So:

• ég athuga = I check
• þú athugar = you check
• við athugum = we check

That is why við athugum means we check.

Icelandic very often makes compound nouns, where English might use a phrase.

Dekkjamynstrið breaks down like this:

• dekk = tire(s)
• mynstur = pattern, tread pattern
• -ið = the definite article suffix for this noun

So dekkjamynstrið means the tire tread pattern or the tread pattern of the tires.

The -ja- part comes from the genitive plural of dekk, so the compound literally has the sense of pattern of tires.

In Icelandic, the definite article is usually attached to the end of the noun, instead of being a separate word like English the.

So:

• dekkjamynstur = tire tread pattern
• dekkjamynstrið = the tire tread pattern

and

• útblástur = exhaust / emissions
• útblásturinn = the exhaust / emissions

The exact ending changes depending on the noun’s gender, number, and case.

Usually útblástur refers to exhaust emissions or exhaust output, though in context it can be loosely understood as the exhaust.

In this sentence, because it is something being checked before an inspection, it most naturally means the vehicle’s exhaust/emissions rather than the physical pipe itself.

Yes. Og simply means and, and both nouns are direct objects of athugum.

So the structure is:

• Við athugum dekkjamynstrið og útblásturinn
• We check the tire tread pattern and the exhaust/emissions

Both things are what we check.

Áður en means before when introducing a clause.

So:

• áður en bíllinn fer í endurskoðunina
• before the car goes for the inspection

It is a very common combination:

• áður en ég fer = before I go
• áður en við byrjum = before we begin

So think of áður en as a fixed expression meaning before + a full clause.

This is normal in Icelandic. The present tense is often used for something that is future in meaning, especially in subordinate clauses like this.

So bíllinn fer í endurskoðunina literally looks like the car goes into the inspection, but in natural English it is:

• before the car goes for inspection
• or before the car goes in for the inspection

This is similar to English in sentences like Call me before you leave, where leave is present in form but future in meaning.

Bíllinn is the subject of the clause bíllinn fer í endurskoðunina.

• bíll = car
• bíllinn = the car

Because it is the subject of fer, it is in the nominative case.

If it were a direct object, you would often see bílinn instead. So this difference is about case:

• bíllinn fer = the car goes
• við sjáum bílinn = we see the car

After í, Icelandic can use either:

• accusative for motion into/to
• dative for location in

Here we have movement into the inspection process/appointment:

• fer í endurskoðunina = goes for/into the inspection

So endurskoðunina is in the accusative singular definite form.

Compare:

• hann fer í húsið = he goes into the house
• hann er í húsinu = he is in the house

Same idea.

Although endurskoðun can generally mean review, revision, or inspection, in this context it means a vehicle inspection.

So fer í endurskoðunina means something like:

• goes for the inspection
• goes in for inspection
• goes to the vehicle inspection

The exact English wording depends on context, but grammatically it is the noun endurskoðun with the definite article: the inspection.

The sentence is built like this:

• Við = subject
• athugum = verb
• dekkjamynstrið og útblásturinn = objects
• áður en bíllinn fer í endurskoðunina = subordinate time clause

So the structure is:

Subject + verb + object(s) + before-clause

That is a very normal Icelandic sentence pattern.

Yes. A more literal breakdown is close to that.

But in natural English, people usually say things like:

• before the car goes in for inspection
• before the car goes for its inspection
• before the car is taken for inspection

So the Icelandic is straightforward, but the best English translation may sound a little less literal.

Yes — this sentence shows several very useful Icelandic patterns:

1. Present tense verb conjugation

   • við athugum = we check

2. Compound nouns

   • dekkjamynstrið

3. Definite article attached to the noun

   • bíllinn, útblásturinn, endurskoðunina

4. A temporal clause with áður en

   • before

5. Case after prepositions

   • í + accusative for movement: í endurskoðunina

6. Present tense with future meaning

   • bíllinn fer = the car goes / will go

So it is a very good sentence for seeing several core Icelandic patterns at once.