2007 Aveo O2 sensor

[Sethor]

My check engine light came on, I had it tested at an auto parts store, their sensor said the oxygen sensor has had low voltage. I have noticed a bit of a decrease in my mileage as well.

Does the Aveo have an upstream and a downstream oxygen sensor? If so, how would I know which one to replace?

Also, does anyone know if it needs a low emission oxygen sensor or an ultra low emission oxygen sensor?

Looking around online, if it is only the one in the front of the engine, the upstream one I believe, it looks easy enough to replace though. I'm not the most technical when it comes to cars, so I do apologize if I'm asking any really obvious questions.

[JB_Fraser]

You will have an upstream and downstream sensor.
The upstream in the exhaust can effect your fuel trims (as can other sensors) but could have you running a ‘richer’ mixture which would degrade your mpg.

You would still want to check for proper power/signal and wiring connections before replacing.
There are quite a few previous posts you search on the forum as some have had issues with new sensors.

Cheers