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My 1998 pontiac firebird service engine light came on and my OBD11 scanner produced 2 trouble codes PO125 ( insufficient coolant temperature for closed loop fuel control.the 3800V6 engine over heating and heater produces cold air only.l replaced the themostat and the(ECT)engine coolant temperature sensor but service engine light still on and scanner trouble code PO125 still on.What else would cause these engine over heating problems and heater not producing hot air, triggering a PO125 code insuf

Posted / edited by AnonymousUser on : 21-08-2017

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