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P0125 Diagnostic Trouble Code Discussion for July 2009

Insufficient Coolant Temperature For Closed Loop

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Trouble Ticket Help Requests for DTC P0125
Help Request Posted
2003 Lexus IS300 3.0L Poor Fuel Economy, MIL Lamp on VIN: JTHBD19223
P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control. We have a problem with the closed loop fuel control. The system does not want to go into closed loop after the car is warmed up. We have installed a new coolant sensor, thermostat, computer, and O2 B2S1. We also checked the wiring for any shorts or anything li...
July 17, 2009