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Old 10-10-2012, 09:05 AM
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Mulchman Mulchman is offline
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Location: Valley Forge, PA
 
Join Date: Jul 2011
Posts: 537
Mein Auto: '07 650i
There have been several posts on this problem with 645's. I would make sure you are using good gas and run a good gas treatment through it. Check your battery. If it is old it may be getting weak which will give you codes. Thermostat is a cheap part on most cars and typical not difficult, but I've never done it on a 645. I'm not sure how a thermostat would cause increased emissions, but maybe someone else can chime in on that.
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'07 650i Coupe - Black Sapphire Metallic
M6 bumpers, skirts & wheels
BMW M Cross Spoke Composite 101 Rims 20"
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