Diagnostic Aids

After confirming DTC P0125, use Toyota hand-held tester or scan tool to access CURRENT DATA to confirm voltage output of heated oxygen sensor No. 1 (bank No. 1 sensor No. 1 or bank No. 2 sensor No. 1). If voltage displayed on hand-held tester or scan tool is always less than .1 volt, circuit may be open or shorted. Using hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.