Code p0156 & p0325 ???? Do i need to change it?

[fettvenne]

I have on my Path 2 trouble code, i know the p0156 is the rear oxygen sensor and the other p0325 is the knock sensor, do i need to change it because it was very expensive! For a few month, i have trouble with the gas, the Path don't take all is power when he needs to climb or accelerate, the engine have low and high gas power?? He smell gas and it take a lot of gas to!!!

Me truck is a '97 , i like it but with these problem it cause me real trouble!!!

[GrilledCheese33]

Change the oxygen and knock sensors out. I know its $$$ but that will cure the running/gas mileage problems your experiencing.

[Wkz1gg0a]

Change it out I had the same exact codes right b4 my inspection and it sucked i had to tip the place a extra sum of $$ to pass me because the knock sensor is alot. Gas isnt going down and with thoes sensors bad youll end up spending more money on gas. my o2 sensor wasnt bad though it was "cleaned" and the code went away. I still got a Knock sensor code which is eating my pockets alive.. I also have/had the symptoms you are stating