I have a 92 YJ with a 4.0 automatic.
I got a check engine light code yesterday. Checked the codes and it is 21 (O2S stays at center or O2S shorted to voltage). No problem I can fix it.
The question I have is what does that cause in the engine? I have very little knowledge regarding fuel issues (IE: How a vehicle runs when lean, rich, etc...) The reason I ask what it causes is that I only drove it a little yesterday when I noticed the CEL today, I ran to the store and noticed that my jeep is quite a bit peppier. I stomp on it and she responds, much better than just the other day when I was out playing.
Is that due to something regarding the fuel and O2 sensor? Or is it something else and the O2 sensor just happened to crap out at this time?
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