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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 05-24-2011, 09:39 AM   #1 (permalink)
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Help!!!new thermostat but check engine light didnt go off!!!

hi guys i have 2001 bmw 325ci , the p1620 came on , i read online thats for the thermostat , so bought a new one , i already installed it , but the code never went away , even after i cleared the code, the car runs perfect doesnt overheat or anything. any one know what might be wrong??

i have to get emission passed anyone know if it will pass VA emission if that p1620 code is on???
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Old 05-24-2011, 01:50 PM   #2 (permalink)
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Have you tried resetting the computer?
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Old 05-25-2011, 07:28 AM   #3 (permalink)
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Welcome to the Werkz.

Is there an electronic sensor mounted on or near the thermostat? Maybe its that playing up. Did the old Thermostat seem to be faulty before you changed it?
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Old 05-25-2011, 12:04 PM   #4 (permalink)
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The same thing happened with me and the service engine soon light.

I replace the t stat, water pump, among a few other things...and the SES light stayed on. I'm thinking now that it's the coolant temp sensor on the side of the engine.

I'm not looking forward to replacing that one.
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