Oxygen Sensors

[ChevyBoi19]

Hello . I have a 96 chevy 2 door Tahoe.

How many 02 oxygen sensors are on this truck?

I'm confused, I was told by someone that there is 4 on it, I don't see but two.

Can someone help me out without all the guess work plz? and is there a difference in a heated 02 sensor and a non heated one?

Thank you in advance for your answers.

Wrote this at 10:27am

 

[Marky Dissod]

Either it's 4 - 2 pre-cat, 2 post cat
Or it's 3 - 2 pre-cat, 1 post cat.

Heated O2 sensors achieve operating temp sooner vs non-heated.

 

[OR VietVet]

Welcome to the forum from Oregon.

Like @Marky Dissod said, should be 2 up front of catalytic converter because of one in each side of the "Y" pipe and one sensor after the catalytic converter.