Will Having a "bad" 02 sensor on a 2000 acura integra affect the gas mileage?

[gerboaboy]

Yes. That's what it's for.

 

[Don W]

Yes, it will. Performance drop will be minimal but milage drop can be significant, 3 or more mpg drop.

 

[Justin]

or performance? and how much?

 

[Mikey]

Yes. Its the sensor for the computer to measure what the exhaust gases are and readjust the fuel / air mixture for the proper amount.

 

[Carman Nguyen]

Definitely.a few miles per gallon.Depends on how bad,maybe unnoticeable.