Sy inspekteer die stuurwiel terwyl sy die voertuig versien.

In Afrikaans, sy can mean either she or his, depending on how it is used.

Here it means she because it is followed by a verb: Sy inspekteer = She inspects.

If it meant his, it would normally come before a noun:

• sy voertuig = his vehicle
• sy stuurwiel = his steering wheel

So the grammar tells you which meaning is intended.

Because there are two clauses, and each clause has its own subject:

• Sy inspekteer die stuurwiel
• terwyl sy die voertuig versien

Afrikaans normally repeats the subject just as English does:

• She inspects the steering wheel while she services the vehicle.

You usually do not leave out the second sy here.

Because terwyl is a subordinating conjunction, and in Afrikaans that usually sends the finite verb to the end of the subordinate clause.

So:

• main clause: Sy inspekteer die stuurwiel
• subordinate clause: terwyl sy die voertuig versien

This is a very common Afrikaans pattern:

• omdat sy werk
• terwyl hy ry
• as hulle kom

So the end position of versien is normal and expected.

Yes.

You can also say:

Terwyl sy die voertuig versien, inspekteer sy die stuurwiel.

That is also correct. When the subordinate clause comes first, the main clause still keeps normal Afrikaans main-clause verb placement:

• inspekteer sy not
• sy inspekteer

This kind of word order change is very common in Afrikaans.

Because Afrikaans verbs usually do not change form for different subjects in the present tense.

Compare:

• Ek inspekteer
• Jy inspekteer
• Sy inspekteer
• Ons inspekteer
• Hulle inspekteer

Unlike English, Afrikaans does not add an -s for he/she/it in the present tense.

Because die is the normal definite article in Afrikaans for basically all nouns.

Afrikaans does not have different forms like the masculine, the feminine, and the neuter article. So you get:

• die stuurwiel
• die voertuig
• die man
• die vrou
• die kinders

So die simply means the here.

Because Afrikaans normally writes compound nouns as a single word.

• stuur = steer / steering
• wiel = wheel
• stuurwiel = steering wheel

This is very typical in Afrikaans. English often separates these words, but Afrikaans usually joins them.

Here terwyl means while, in the sense of during the same time that.

So the sentence shows two actions happening at the same time:

• she inspects the steering wheel
• she services the vehicle

In other contexts, terwyl can sometimes also mean something closer to whereas, but in this sentence it is clearly the time meaning: while.

Because versien is a finite verb here, not an infinitive.

In this sentence:

• sy die voertuig versien

the verb belongs to a full clause with its own subject (sy), so you do not use te.

You use te in structures like:

• om die voertuig te versien = to service the vehicle

So:

• terwyl sy die voertuig versien = correct
• terwyl sy die voertuig te versien = incorrect

It can do either, depending on context.

Afrikaans simple present often covers both:

• a general or habitual action
• an action happening now

So this sentence could mean:

• She inspects the steering wheel while she services the vehicle or
• She is inspecting the steering wheel while she is servicing the vehicle

If you want to stress that something is in progress right now, Afrikaans can use a fuller structure such as:

• Sy is besig om die stuurwiel te inspekteer...

But the original sentence is completely normal.

Yes. versien is a good Afrikaans verb for service, maintain, or overhaul, especially with machines and vehicles.

So die voertuig versien is natural.

In everyday speech, speakers might sometimes use a more specific noun like motor instead of voertuig if they mean a car in particular, but voertuig is perfectly correct and natural.

It sounds fairly neutral, with a slightly technical feel because of words like inspekteer, stuurwiel, voertuig, and versien.

A more everyday version might use simpler vocabulary, especially motor instead of voertuig. But the sentence itself is good standard Afrikaans and does not sound unnatural.