How can i tell if my 02 sensor is bad?

 

Is your Check Engine Light on?

If it is, do you have a buddy at a shop?

Have him or someone use a scanner on your computer to find out the code it is throwing...that should get you most of the way there!

I'd say chances are, if there is no CEL, then your o2 sensors are probably good to go. But certainly consult a Pro.

 

autozone does that for free, so he doesnt need a buddy at a shop.

 

No cel, but I dont know what else to do about my horrible mpg...It doesnt bother me as much but i see you guys getting like over 250 and yesterday i got 90 on a half tank of normal driving with ac...Did all my maintenance...whats next? It Would be nice to get the numbers you guys get.

 

Im in the same boat as you, terrible gas mileage and it sucks cause its so expensive now. Ive got no idea what else to do, ive run out of ideas.

 

what year is yours? 95 and down won't neccessarily throw a code.
how recently have you done a tuneup?

a slow responding O2 won't neccesarily set off an engine light but it will affect gas mileage.

 

I have a 98 gsr. I did a full tune up about 2 months ago.

 

i have bad milage too, gas sucks... if u did the tune up, and ur not trowing a code, try taking the sensor off, and cleaning it, there could be dirt and other **** stuck up it, id clean all your sensors to eliminate the problem, other wise , it could be a fuel problem, or a electronic problem... hope it works out for you...

 

well, I think my piston rings are worn a bit...If I start it up and rev it high i get a bit of smoke..but once its warm, no smoke...and I have to give it about 1/4 quart of oil(mobile one 10w-30) if i drive hard for a bour 2-3 days...this normal? And if my rings are worn, is this screwing my mpg?