LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1998 >> ES 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control (CALIFORNIA Models) >> Circuit Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit Description

The oxygen sensor monitors exhaust gas oxygen content and delivers an input signal to ECM. The ECM uses this input signal to determine fuel injection system operation. Sensors include heater. DTC P0125 is set when sensor output does not change once engine is at normal operating temperature, engine speed is 1500 RPM or more, vehicle speed is 25-62 MPH, and throttle valve is not fully close for at least 1.5 minutes. Possible causes are:

scientia non olet · About LEMON Manuals