A/f ratio gauge + O2 sensor?

**krystalized_jdm** · 07-13-2011, 04:25 PM

Went to go splice this wire in today to find there are 3 wires on my o2 sensor.

A red, Green, And black wire.

Which one do I splice this new gauge wire into?

Also, could you tell me what the other ones are for?!

Thanks guys!

- Stephen

**mfroese** · 07-13-2011, 05:05 PM

Widebands should have their own sensor and have the option to relay the reading to your ecu should you put it in the stock o2 sensors hole. Most weld on a bung on the down pipe as the 2 merge. narrow bands are useless IMO. I installed an Aem uego recently and didn't touch stock o2 harness/wires at all.

**feyd182** · 07-13-2011, 05:07 PM

It's a heated o2 sensor, one is power, one ground, one signal.

**krystalized_jdm** · 07-13-2011, 05:22 PM

Well which wire is which? Thats all I need to know.

**cschepp** · 07-13-2011, 06:46 PM

I could see red-power,green-signal, black- ground. From what I remember

**TheyKilledKenny** · 07-13-2011, 06:59 PM

You should be putting your wideband around 2 feet down from the turbo on the dump pipe. Cut a hole out and weld in the new bung then wire in your new wide band o2, just leave the old o2 as is because your ECU still needs it to function properly.