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Oem wideband

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I have a 2005 WRXSTI and I am unsure if my stock

O2 sensor is a true wideband. How can I determine this? If it’s not then how do I interface my aem wideband to the software? Hopefully i can tune straight from the factory setup in the same manner as the example with the fa20 engine. Thanks

Hello Michael

Wideband/Air-Fuel sensors perform the same function as a regular 02 sensors, but they precisely measure the amount of oxygen in the exhaust rather than just switching between rich (too much fuel, not enough oxygen) and lean (too much oxygen, not enough fuel). most narrowband sensors have up to 4 wires where a wideband generally has 5-6 wires a wide band will also there will be TWO SIGNAL WIRES - these are called the "Current Pump" wires. The voltages on these current pump wires vary from manufacturer to manufacturer. Toyotas have 3.0 volts on their reference wire and the 3.3 volts on the current return wire. as to if you can wire it into your ECU, I'm sorry It cannot. but there are a lot smarter people that may have found away

Regards Ross

i understand the difference between wideband and narrow band sensors. andre tunes a white wrx fa20 in the flash tuning course without an extra aftermarket wideband. he uses the oem sensor. in the course he says that the oem sensor is actually a wideband. i realize that oems usually use a narrow band. im really just trying to determine if i can tune my 05 usdm sti using the oem sensors. oh and i am using cobb accessport. thanks

FA Wrx comes with a wideband. 2005 sti has a narrowband. iwire sells an adapter that allows you to connect a wideband into the access port for around 300