Resolved Faulty O2 sensor?

[dispinoygotgame]

so my "service engine soon" has been going on and off the past week & i finally get it scanned and get thrown the code P 134. supposedly a faulty o2 sensor but i was wondering if you guys know which one it is? i dont really want to buy both if only one needs replacing. thanks

 

[Orion97gs-t]

That is your upstream 02, one near exhaust mani if i'm not misstaken

 

[VelocitàPaola]

That is your upstream 02, one near exhaust mani if i'm not misstaken

Yep, upstream... near the exhaust manifold.

That's code P0031, by the way, not P 031.

 

[dispinoygotgame]

alright thanks!