Fits-

Saab 9000 all turbo, 1986-1989

Saab 900 16V-T 1986-1990
Saab 900 16V-T 1985-1994
Saab 900 8V-T 1981-1984

 A defective unit usually will cause a base boost condition (the car won't boost past 5 PSI and will be very slow to accelerate), or constant overshoot which will cause unusually high boost which will trigger fuel cut (this will feel as though someone momentarily kicked your foot off the gas), and then it will cut back on. If, severe this will happen repeatedly any time you try to accelerate under boost These are very expensive to buy new (over $200), so this is an excellent value. guaranteed to function for 30 days after purchase, though it will likely last for years - only a 30 day guarantee, this is used, and much much cheaper than a new unit.