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Home >> Lexus >> 1995 >> ES 300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Engine Controls - Tests W/Codes - OBD-II) >> Diagnostic Testing >> Code P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 1995 Lexus LS 400. However, it is still accessible from the selected car via links, so may be relevant.

The oxygen sensor monitor exhaust gas oxygen content and delivers an input signal to ECM. The ECM uses input signal to determine fuel injection system operation. Sensors include heater. Code is set when sensor does not output a rich condition once engine is at normal operating temperature, engine speed is 1500 RPM or more, and vehicle speed is at least 25 MPH for at least 2 minutes. Possible causes are:

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