Buy 2020 Gmc Sierra 2500 HD Base Extended Cab Pickup Oxygen Sensor (Rear, Lower). 5.3 liter, front of Front, Converter, Left - OEM Gmc Part # 12587785

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

Oxygen Sensor

5.3 liter, front of converter. 5.3 liter, rear of converter. All Models; 5.3L; Front. All Models; 5.3L; Rear. Front. Front, 5.3L. Rear, 5.3L.
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 2020 GMC Sierra 2500 HD to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and GMC genuine parts.