Engine o2 sensor question

o2 sensor question

is there any way i can hav a bad o2 sensor and the cel not come on cuz my performance is way off im thinking im only hitting 108hp i hav 77kmil n im on time with the maint.

i doubt its ur O2 sensor try cleaning out your Mass Air Flow Sensor (MAF) with a q-tip becareful to not bend the electronic sensor.

is that the thing i scrtewd on my intake?

If you have a 2002+ Corolla then the MAF is the first thing you should try cleaning.

O2 sensor can also cause drivability problems - but the MAF, if equipped, is usually the culprit. Other things to check are loose vacuum hoses, cracked or leaking airbox, etc.

i thought it was the 00-02 that had the MAF since the VVT-i was introduced at the same time.

you can simply one the air box, and bend it back a little bit to expose the sensor and you can clean it like that.Make sure the car is Off.

Doh! My mistake - I though I typed 2000+ and not 2002+. Must be one too many beers tonight.

i didnt quite get that what part do i clean?

the little electrode that is located inside the airbox. it may be dirty and you may not be really abel to see it. is located inside the circular part of the the sensor housing.

hehe, thats why u shouldn't drink but its cool as long as you don't drive.

ok i hav an intake its the square looking thing thats screwd down right?

Check this site - directions are for an MR2 - but the MAF looks very similar to the one in the Corollas.

http://www.spydermagazine.com/2002/March/maf_clean/maf_clean.htm

yep remove that and clean the internal circular part GENTLY.