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P0128 Diagnostic Trouble Code Discussion for December 2008

Thermostat System Malfunction

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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2004 Mazda 3 S 2.3L MIL Lamp on VIN: JM1BK34364
P0128: Thermostat System Malfunction. ... replacement customer returns to say that MIL is on again. P0128 hard AND pending. Installed new OEM Electronic Coolant Temperature (ECT) sensor even though I observed old ECT (via scanner data)go from cold to hot with no problem. At the time I noticed a va...
December 16, 2008