02 sensor

[blackbeast]

would a 02 sensor cause the rpm to be above normal
i have a 2001 alero 2.4l

[SIUlero]

It could cause the idle to be erratic, going up and down slightly, but it shouldn't be noticably higher...check for a vacuum leak by lightly spraying brake cleaner around the edges of the intake and near vacuum hoses. If the rpm's start to jump around, note where the brake cleaner is going in and you've found your leak. Is your check engine light on?

[blackbeast]

no the check engine light has not come on but i got a computer put on it and they said the the #2 02 sensor was going out.
usually the rpm's is sitting at 2 lines under the number 1. but now it sits 1 line under the number 1 and doesnt drop until i drive over 6 blocks or so.
i had cleaned the air filter put some fuel injector cleaner in and cleaned the iak but hasnt changed .