I got the code P0140 (sensor 1 bank 2) the other day and now the SES light for it is out. I have 3 questions.....
1. Would this cause crappy gas mileage?, cause it started to suck the week before I got the SES. I use to get 250-260 miles to a 1/2 a tank, now I get 170-180.
2. What is the GM...