o2 sensor

[98240]

I got a downpipe made for my car. They removed my cat and only welded in a bung for my wideband. So I have a check engine light on and I dont know what to do with the o2 sensor. Also since the cat is removed what should i do with teh second o2 sensor. I have a 98 240sx

[Chezedik]

Get an oscillator for the second O2 (it is a O2 delete), search for O2 delete and you will find it online. After that, you will want a second bung or you can chance it with it removed. You should be fine, but part throttle may run a little rich with it out, and lean with it in.