The 2AZ-FE ECM for the tC has a factory wideband bank1/sensor1 on the oem header w/ cat that measures the A/F ratio. Just before the secondary cat on the s-pipe is a factory narrowband O2 bank1/sensor2 that measures the efficiency of the emissions system so the ECM can fine tune things for MPG and a clean burn. If we had a v6 or v8 you would see bank1/sensor1 and bank2/sensor1, etc. Inline engines only have 1 bank of cylinders.
The anti-fouler trick is already well documented around the forums works most of the time. It pulls the O2 sensor out of the exhaust gas stream to fool the ECM into thinking that the primary cat is there and working for aftermarket headers. Have your car's OBDII/CAN system scanned for the exact codes. It might be something different.
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