Gen8888

Hi, i pulled codes 1445 which i believe is the Purge Volume Control Valve and front 02 Sensor and Knock sensor. I cleared the ECU and the only one that came on again was the 1445. So my question is, does anyone know how to install this part? Does anyone have any experience with the Purge Volume Control Valve? Also since I cleared my ECU, do you think the 02 Sensor and Knock sensor still could be bad even though my CEL did not come on? I do feel that my car has not too good of gas mileage. The car feels sluggish at times but I'm not too sure if thats normal since the knock sensor could have been bad for awhile and i've just gotten used to the performance. If i do replace the 02 sensor, will that make a difference in power or gas mileage? I know the knock sensor will affect those areas. btw, my CEL never came on for any of these codes, I just pulled codes to see if i did have any and these came up on the comp. Thanks for your help in advance.

Gen8888

I guess from other threads that the 02 sensor if bad is going to give worse gas mileage as well. Well i guess i'm going to go order the knock sensor and 02 and have them replaced to see if that solves the problem.