Diagnostic Aids

After confirming DTC P0125, use Toyota hand-held tester or scan tool to access CURRENT DATA to read heated oxygen sensor No. 1 output voltage. If output voltage is always less than .1 volt, heated oxygen sensor No. 1 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.