First, let's take the word Citation. Now, I realize you drive a Citation in "real life," but that doesn't mean it's not also symbolic. A citation is an award, recognition, a pat on the back---maybe your dream thinks your car (you) might be worth more than you think. On the other hand, a citation is also a summons---maybe it's a warning you need to slow down, on the road or in your life? (Given that you drive a Citation, I'd say it's in your life.)
However, your dream could refer to another kind of summons---from, as it were, higher forces. Your "mechanics" could be dream-representations of what the ancient Greeks referred to as deus ex machina---literally, the "god from the machine." And what are your dream-mechanics fixing? On one level, your engine---let's call it your motor of life, your psychic drivetrain. Your car/self may seem humble on the outside, but under the hood, you've got three components (note the powerful trinity symbol) that make your engine---your life-force---self-sustaining. I would take this, perhaps, as a herald of a new self-sufficiency and personal efficacy. You should open the throttle wide and see what this baby'll do.