Oxygen Sensor on 1990 Buick Riviera

How many oxygen senors are there in my 1990 Buick Riviera? I have been told they have more than one.

by in Lancaster, OH on October 23, 2009
1 answer
ANSWER by , October 23, 2009
there is only one o2 sensor on your car ,, after late 1995 there would be more