Already bogged down in a series of cases of improper vehicle tests, Nissan Motor Co. said Friday that it has found new misconduct and will recall about 150,000 automobiles.

While the Yokohama-based automaker has been hit hard recently by the arrest of former Chairman Carlos Ghosn, the improper testing scandal has been a headache since last year, so far leading to the recall of more than 1.1 million vehicles.

The fresh revelations came after the automaker said in September that it was confident it could prevent a recurrence of improper vehicle inspections.