do you think its a vacume leak, bad map sensor, or maybe both? My downstream o2 sensor (I believe) goes everywhere when I give it gas. It might be bad, or the cat is bad it does say its at 57 percent efficiency.
But im not sure about my upstream o2 sensor. If I understand correctly and if I’m looking at the right one on my scanner (it says wide range o2s bank 1 sensor 1), it might be bad. Im not fully sure. I reduced the graphing range on the graph to the smallest numbers, but it still just looks like a straight line.
This is a picture of the graphs while driving.
Monday, March 9th, 2026 AT 3:32 PM




