iam wondering would a bad o2 sensor cause a car to have a rough idle?





1995 bonneville se

Can you tell us all your symptoms, and tell us everything you've done/changed? Sounds alot from your posts that you're chasing a gremlin. These sporadic posts all over are making this confusing.

Let'* focus in on this in one topic and nail it right the first time.

I agree. Makes me wonder what he'* really trying to sell in the For Sale section.

In my car whenever the idle get'* really lumpy or rough....and the SES light comes on....It only throws a O2 sensor code...So I'm going with yes...even though my sensor was not even in the car for 2 hours...it still does that

most likey a bad O2 will throw the SES, but not always

the only symptom is the the car has a rough idle when sitting, ive notice if the car is in park then the idle seems smooth, now if i put the car in drive and i have my foot on the brake the idle is a little rough, the car accelrates and drives fine its just has that bad idle when the car is at a complete stop i can even feel it on the steering wheel

how is your MPG?

my miles per gallon sucks, with a full tank of gas iam getting about 215 miles or sometimes less, now thats city driving, iam easy on the gas, i dont have a heavy foot at all, also what is the ac delco part number for the o2 sensor?

Here is the AC Delco link.
http://www.acdelco.com/html/catalog/index.htm

I came up with ASF-75 but please double check that.

That is a good question about a O2 causing rough idle. So many things can cause rough idle on these motors.

The GM part number for you O2 sensor is also posted in TechInfo. You can use that number to order it from gmpartsdirect.com.