My 02 Civic LX has been going into Limp mode (wont go past 4k rpm in neutral or drive) for about a week, even though the CEL hasnt come up. The three codes that have shown up are P1259, P0141, and P1491.

I havent started doing any trouble shooting on the O2 sensor but I will. My question is on the P1259 and P1491 codes. I haven't found and don't believe the 2002 Civic LX has Vtec or EGR valve. So why am I getting these codes?!?!?

Any help will be appreciated.