Check Engine Light and/or Engine Overheating on BMW 330Ci

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: 98,887 (47,550–200,000)
6 model years affected: 2001, 2002, 2003, 2004, more2005, 2006
12 people reported this problem
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problem details
rough idle, check engine light on and overheating Replaced expansion tank, thermostat and disa valve. Having entire cooling system checked as well.
2004 BMW 330Ci 80,000 mi,
Repaired by Dealer. Thermostat replaced.
thermostate failed at about 130K miles and had to be replaced
2006 BMW 330Ci 47,550 mi,
check engine light on / thermostat identified/ thermostat replaced. low coolant level light was on too that am with start up but turned off by it self. so far so good though.