Abstract: A failure diagnosis system for a vehicle includes a failure detection means for detecting failures of devices or apparatuses installed in a vehicle, a storage means for storing failure information detected by the failure detection means, a failure display means for displaying failure information stored in the storage means, a time information means for adding failure information detected by the failure detection means and stored in the storage means to time information showing the time when the failure information is detected, a retrieval time input means for inputting a retrieval time and a selective display means for displaying selectively failure information which has time information being within the retrieval time.