Shop Buick Century Oxygen Sensor (Rear, Lower). 4.2 LITER. Oxygen Sensor - Repair or Replace A EMISSION, LITER, Make - OEM Buick Part # 12604538

Sensor. Oxygen.
Oxygen Sensor. Assembly - Heated (O2) (POSN 2). Ft. Snsr.

Oxygen Sensor

Fits Envoy, Rainier, Trailblazer

4.2 LITER.
Oxygen Sensor - Repair or Replace
A failed Oxygen Sensor will often have no noticeable symptoms beyond a check engine light, but it does cause your to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and genuine parts.