The engine model serial code for the 1998 Toyota Supra 12092108.
O2 sensor circuit high voltage (bank 1 sensor 2)
under the driver side and after the pre catalytic converter ( the second sensor). regards.
Trouble code P0340 means:Camshaft position sensor circuit malfunction
Trouble code P0172 means: System Too Rich (Bank 1)
Trouble code P0505 means: Idle Air Control System
Trouble code P1300 means: Igniter Circuit Malfunction No. 1
Trouble code P0401 means:Exhaust gas recirculation flow insufficient detected
The color code is on the sticker which as attached to the of the car from driver's side.
Trouble code P0446 means: Evaporative Emission System Vent Control Circuit
Trouble code P0441 means: Evaporative Emission System Incorrect Purge Flow
Try this http://www.fixya.com/cars/t4081403-98_toyota_camry_srs_airbag_trouble_code