Why on .my 97 nissan .maxima gxe show of light on i check with scanner and say knock sensor and oxygen sensor .how can i fixt it and is a big problem run like that

 

Search youtube. Knock sensor is doable with small hands and a variation of swivels and extensions. Oxygen sensors are simple enough as long as you don't have a ton of rust.

Car will run much better once it's fixed up.

 

Fix O2 sensor code first as the KS code is often a false piggyback code.
Replace O2 sensor, clear codes. Drive and see if KS code returns. If so, you may actually have a bad KS.

 

PB Blaster is now your BFF!

 

I want to know where is of location of bank 1 sensor 2 i have fed emmision so somebody show me a picture whre ia it . And if is upstream or downstteam thanks