Ok so i noticed my car driving abit odd lately. Ive drivin the car for the past 3 years i can tell when something is starting to go wrong. So i took it to autozone since i dont have a scan tool and they told me i have a P2610 error besides the error for not having a CAT. I was wondering what this code means im not really sure wut it means by "ECM not programmed" or something like that. Also I use 93 octane gas in my car and i went from my usual 27-29mpg to a now 22-23mpg. I just wanted to know because my gas has never been drained this quick. Plus I need help on how to fix this error code. Please any help is appreciated.