Ok...I think I have the most experience with my god damned oxygen sensors over the past two years, so I'll tell you what happens. (yes I'm pissed at the little buggers)
On the first one that was messed up, the car would seriously bog down after stopping at a stop sign or stop light. Annoying as hell, let me tell you.
Then, the second one that had to go was a lot more subtle. My check engine light came on, but not for the "oxygen sensor" code, but for fuel delivery since I was running so lean. So I eventually gave up after about 3 months of trying to troubleshoot it and they replaced it. Has run fine ever since. Basically, all it did was get bad gas mileage (like 19 hwy!) and feel weak driving around the neighborhood.
Hope that helps a little.
On the first one that was messed up, the car would seriously bog down after stopping at a stop sign or stop light. Annoying as hell, let me tell you.
Then, the second one that had to go was a lot more subtle. My check engine light came on, but not for the "oxygen sensor" code, but for fuel delivery since I was running so lean. So I eventually gave up after about 3 months of trying to troubleshoot it and they replaced it. Has run fine ever since. Basically, all it did was get bad gas mileage (like 19 hwy!) and feel weak driving around the neighborhood.
Hope that helps a little.