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Home >> BMW >> 2007 >> Z4 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Self Diagnosis - Diagnostic Trouble Codes - DTC P0010 - DTC P1198 (N51, N52) >> BMW MSV80 >> DTC P0128, BMW Hex Code 0x2EF4, BMW Code 12020: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) (PLAUS) >> Possible Fault Causes

Possible Fault Causes

The thermostat seizes in open position (sticking in open position corresponds to a gap of roughly 1 mm!); Engine fails to warm to normal operating temperature.

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