1995 200sx 1.6L

Checked my codes and got 33 and 34 which say front heated oxygen is problematic and knock sensor isproblematic (car feels like its pulling timing even if i run 91 octane )



My gas mileage is really not that great (with a full tank i do roughly 200 miles and thats 50 liters)

anyone got any fixes and advice for me on this situation? i dont care about fixing the problem i really care more about my gas mileage but if thats related to the ecu codes i guess i have no choice to fix em. This is just a junk winter car for me.

Knock sensor is ****ed so it's thinking the engine is knocking so it's adjusting timing which is messing up ur gas mileage?

im not too sure im gonna start with the 02 sensor