In the tank
The 2006 Scion xB runs on regular unleaded.
The 2006 Scion tC runs on regular unleaded.
the filter is in the fuel tank and is part of the fuel pump, so if the filter needs changing so does the pump. access is under the rear seats.
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As far as I'm told, you don't. 2006 Scion Xa's came with a tray where the filter would go, but there is no "Cabin Filter" for this vehicle. According to two of my Toyota/Scion dealers, though a filter might be made to fit, doing so would restrict the air flow because the vehicle air/venting system is designed to work without one. You can check with your Scion dealer, but this is what I was told when I was unable to find a cabin filter's at the parts stores and later, Scion parts itself.
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