2007 Vibe base manual 5spd
I was getting a catalytic converter below efficiency threshold code. I know this can be caused by bad O2 sensors. Unfortunately I was still under the impression cars had upstream O2 sensors. I trouble shot it as such. I have now learned about wideband AF sensors. My testing was pretty much useless, but I do believe the sensor was bad. I ordered both upstream and downstream denso sensors. After installing the new upstream sensor and clearing my codes the car seems to run better. I used to smell gasoline and was fairly certain it was running very rich. No more gas smell. I'm just trying to verify that I have things sorted and there aren't other issues. My downstream sensor seems to oscillate between 0.15 and 0.84 at idle. The upstream oscillates between 3.15 and 3.40. I was expecting both of them to be a little more flat. Long-term fuel trim runs at 2.34. short-term fuel trim has a sawtooth pattern oscillating between -0.75 and 3.1.
Are these acceptable values? with the long-term running at a positive 2 plus I'm wondering if somehow I still have a lean condition, meaning I have an air leak somewhere, or would unhooking the battery for a while to erase previous incorrect readings possibly help?