Hi guys,

My car's gas mileage has been absolutely terrible lately. I hear that a major culprit is the o2 sensor. I have no clue what or where this thing's located. How hard is it to replace this thing, and where can I purchase a replacement.

Besides the o2 sensor, is there anything else I should check?

Thanks!

1997 Mitsubishi Eclipse GS - SOLD!
2002 BMW M3 - Garaged for the Winter
1992 Honda Accord - Beater for now
Shopping for another winter car...

I would start with plugs and wires, then go for air, fuel filters, pvc valve. The oxygen sensors are located on the exhaust, usually they'll give you trouble to remove if they are rusty. I would think any auto parts store has them.

ASE certified master auto technician

Yeah, and they're fairly expensive...like $40 a piece or something like that (don't flame me, just guessing). So I'd do the other stuff first