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So I pulled off my cat today and realised that the last person, welded in the oxygen sensor, AND it wasn't plugged in?...

Either he had a full aftermarket ECU setup, or he did something to it??

The cars been running fine, but... doesn't it need it??!

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https://www.sau.com.au/forums/topic/336386-wtf-oxygen-sensor-not-hooked-up/
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the 02 sensor is on the dump pipe on BNR32, 1 sensor per dump pipe

on the car there is another sensor, exhaust temp sensor, which is not really needed and your car will work fine with it unplugged or removed

it throws on the cat temp light on the dash when cat temp is too high

ah thanks man... puts my mind at ease...

I pulled everything off and realised the cat doesnt have threads, so I need exhaust bolts....

this is when a second car comes in handy... had to put everything back in again.

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