Three problems related to emission control have been reported for the 1996 Buick Skylark. The most recently reported issues are listed below.
The check engine light came on due to oxygen sensor failure. Yh.
Ongoing problem with engine check light coming on. On three occasions dealer replaced the oxygen sensor under warranty. However, problem reoccurred and oxygen sensor needed to be replaced again. Dealer notified, and has not informed consumer whether oxygen sensor will or will not be replaced at consumer's cost.
Oxygen sensor failed twice due to check engine light coming on. (qcaw).