With his return, KARR curiously has a number of minor changes from his first appearance, including:
The scanner at the front is now yellow/green (instead of red)
His scanner now makes a sound identical to KITT's (instead of the deep 'drone' noise of the original)
His license plate now reads 'KARR' (instead of the original 'KNIGHT')
The sound of his engine now more resembles KITT's (all-be-it with some additional effects), instead of the fierce "roaring" engine sound previously.
The casing around his voice modulator is slightly different