Check engine light has been on for a while in my 99 SE with 68k miles. I was at autozone today and decided to have them run the codes. I came up with the following
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1.
P0171 System Too Lean - Bank No. 1.
Car doesn't seem to have real bad performance although gas mileage is good, it's not as good as it used to be. Anybody have any idea what this is and how simple of a fix it is?
