Number of O2 Sensor on 2014-present GMC Sierra Models

[noobauto]

Hi, it's a noob here really need to find out how many O2 sensor present Sierra engines come with? So far I know most of the V8 engines come with 4 sensors, then what models come with 5 sensors? I heard some Sierra come with 5 O2 sensor with 5 cat installed. Can any Sierra guru here clear my confusion?

[CamGTP]

Only 4 sensors.

 

All of the GM trucks have 3 cats. The first two are monitored by the computer and the 3rd cat at the merge section of the exhaust is not monitored and is for emissions reasons.