A dealership is going to up that price a bit.
The tC actually has 2 sensors for Air/Fuel mgmt. Bank1/S1 is the wideband air/fuel ratio sensor located in the OEM header, before the primary cat.. It is responsible for the main air/fuel calculation data for the ECM. Bank1/S2 is the narrowband O2 sensor. It is located in the s-pipe. This is after the primary cat and before the secondary cat. The 2AZ-FE is a EGR-less motor and the narrowband is there just to measure the overall efficiency of the wideband calculations so that VVT-i does not throw things out of proportion.
You will need to have another O2 bung welded in or near your header to mount your sensor. It needs to be close enough to the exhaust ports for an accurate reading but not so close as to get scorched by EGT's. I am running the PLX Devices wideband AF. It has a secondary output for narrowband that I send that data to my ECM. I have found that the AFR reads lean for the wideband data so readings are skewed for that. IT is connected to my Greddy Ult, but it does not tune it.
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