Check Engine Light and/or Engine Overheating on BMW 325Ci

The thermostat may fail resulting in engine overheating and/or illumination of the Check Engine Light. Replacement of the thermostat along with a complete inspection of the cooling system will be necessary to correct this concern.

Overheating can cause severe engine damage. If the engine begins to overheat it is recommended to stop at the first available location and have your vehicle towed to a repair shop.

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Average mileage: 101,740 (26,200–148,000)
6 model years affected: 2001, 2002, 2003, 2004, more2005, 2006
12 people reported this problem
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problem details
2006 BMW 325Ci 148,000 mi,
Using an OBDII Scanner Tool, error codes determined that the thermostat failed open, and the service engine soon light came on. Replaced thermostat, problem went away. No engine overheating occurred.
2006 BMW 325Ci 26,200 mi,
Service engine soon light came. As per my Non BMW mechanic, thermostat was the culprit, which was replaced.
Thermostat stuck open. replace thermostat.