CystumMax

I had a CEL Wich was for Evap canistor valve contorl. P1446. I replaced it the other day. Since then I am getting ****ty Gas Mileage. like 13-15 Mile per galon, under normal driving. Does anyone know what else could be wrong. There is no Code right now.
Is this because the ECU need to get reporgrammed?
I also have a JWT Pop charger and a Y-PIPE.
Thanks In advance.

sunten1

Normal Driving means not flooring it every second right???????????

I would wait a few more days...Sounds like something else might me ready to break
Did you check your tires???

CystumMax

Yes i checked my tire, i have right PSI set for my tires.
Yeh I am thinking another O2 sensor might be going bad. I changed one Already.