Buy OEM Buick Part # 19178937 (25312188). Oxygen Sensor (Rear, Lower). 2.2 LITER, rear of converter. 3.8 LITER. 3.8 liter, in exhaust pipe. All Models; 3.8L; In Exhaust Pipe. All

Oxygen. Sensor. Assembly, Heated (O2). Ft. Snsr.
Oxygen Sensor.

Oxygen Sensor

Fits Camaro, Regal, S10 , Sonoma

2.2 LITER, rear of converter. 3.8 LITER. 3.8 liter, in exhaust pipe. All Models; 3.8L; In Exhaust Pipe. All Models; 3.8L; To Converter.
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 Buick to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and Buick genuine parts.