Well for the past month or 2 my car has been misfiring a lot, and smoking a little. So i took it to auto zone to get the CEL code checked out.

Came up with a Misfire Code on Cylinder 2, and o2 sensor bad....

I bought a used o2 sensor from another TR member at a really good price and finally got it put on today.....I reset the computer and cel was off. About 5 minutes later it comes back on and it has been on since. The new code says that it is running too lean. Could this just be because it is gonna take a day or 2 to get everything back to normal w/ the computer and the o2 sensor?