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P0125 Diagnostic Trouble Code Discussion for August 2007

Insufficient Coolant Temperature For Closed Loop

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Trouble Ticket Help Requests for DTC P0125
Help Request Posted
1999 Toyota 4Runner Limited 3.4L Hesitation VIN: JT3HN87RXX
P0125: Insufficient Coolant Temperature For Closed Loop. Truck has no power. It Barely moves at light throttle. Falls flat over 1/4 throttle. Idles ok. Had code for O2 sensor heater, I tested it and the heater was open. I put on a new one B1S1. Checked it with scanner. It didn't work. It stays stuck at 660mv. I unpl...
August 22, 2007