Visual inspection, retrieval and reporting on trouble codes are free of charge. Additional diagnostic may be recommended and charges apply. Only for vehicles 1998 and up.  This coupon must be presented at vehicle drop-off at participating centers. There is a limit of one coupon per vehicle, and the coupon may not be combined with other offers, discounts, or special fleet pricing. The coupon is valid on most vehicles, but certain exclusions apply. Void where prohibited or if altered.