i got a header installed on my 01 z24 today and i was driving a while and than got a CEL. It was code po130 bank1sensor circuit mulfunction. obviously the 02 sensor is getting a bad reading so what is the suggestion that i do...heated 02 sensor or what? also if im just cruising in 2nd or 3rd and i floor it and then let off after a few second you can hear a noise like metal on metal. any help would be aprreciated, thanks.

Look at it and see if it is hitting anywhere.

What the hell has happened to common sense and simple troubleshooting?

@!#$ the O2 sensor.

my header is hitting the rack and pinoin and i bet thats what you hear. get good motor mounts like i need too.

IMO, New mounts when you install a header is a must.

Unless you have a flex joint, The stock mounts will move too much and can break the flange.

You have to get a heated 02 sensor.