vtec8200

Hi, my 90 si has hesitation/stutering at constant speed until the check engine comes on, then all is fine. CEL code is 1 (oxygen sensor). There does not seem to be anything wrong with the wiring.

I am looking through ebay and found the ngk/ntk brand and bosch brand, and I remember seeing comments about certain o2 sensors that made the car run like crap even if the part was brand new so I would like to get peoples opinion on this,

Also, can my bad o2 sensor cause a fluctuating idle? idle goes up to 2000rpms for maybe half a second then drops back down and up again. I have cleaned the IACV thoroughly (wasn't very dirty) and I have bled the coolant, was just wondering if a bad o2 could cause this.

thanks

vtec8200

There is also Denso, which I know is usually good quality, 10$ more than the ntk.

90_EX_Civic

when in doubt run ngk. denso is, if im not mistaken, a sister company of ngk

meda215

bosch is one of the best oem parts manufacturer......all widebands use one of the o2 sensors from bosch

freddy chavez

I had the same problem with my iacv and cleaned it and looked new but just wouldnt work.tried my friends iacv from his car and workes beautifull.my guess is u should just replace it like i did

CRX Toad

Denso, NGK, Bosch in that order. I hate putting Bosch on a customers car because they just don't seem to hold up as well.

villc713

bosch o2 sensors suck.......wideband o2 is another story.....get the denso or ngk

vtec8200

got the denso!! thanks!

gabrielsousa

i too have fluctuating idle, did you fix yours ?