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.

 

[Eman85]

Where are you seeing the 2 that you see? Does the truck still have cats? Heated O2 sensors have a voltage feed that heats the sensor so it starts working faster. The non heated only have 1 wire, the heated have multiple wires.

 

[Big Mama]

Get under it and look at the exhaust near the engine. Follow that down and you’ll see one on each side. Your rig may have been modified and you have 2 exhaust pipes without sensors.