Hello,
You can't directly update a record using an Airtable form, they are made to create new records. But you can have another table, with the same structure than the one you want to update, to get the data provided through the form and the set up an automation to update the "real table".
Here is an example to illustrate.
Table "Registration"

Primary key is the license plate
2 single select fields to decsribe the state on the interior on one hand and the state of the tyres on the other hand.
Table "Registration Update"
Same structure than table "Registration" (at least for the fields that we want to update through the form)

Form Registration
Form is built on table "Registration update":

Automation
When a record is created in table "Registration Update", we search for the corresponding record in table "Registration" and update it if found
Trigger: when a record is created in "Registration Update":

Find recors in table registration with the same "registration_id":

Check if a record has been found:

If yes, update record in table "Registration":

Regards,
Pascal