Diagnostic Aids
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
If DTC P0010 displayed, check left bank OCV circuit. If DTC P0020 is displayed, check right bank OCV circuit. Read freeze frame data using hand-held tester or OBD-II scan tool. Freeze frame records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich at the time of the malfunction.