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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 01-10-2010, 01:34 PM   #1 (permalink)
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SES light, P0128, P1193

So the SES light is on and I got the codes read at AutoZone and came up with the following:

P0128: Coolant Temperature Below Thermostat Regulating Temperature

Probable cause is a faulty thermostat which, I hear, is a common problem in e46's.

P1193: Post Catalyst fuel trim system bank 2

Probable cause is a faulty MAF meter.



The engine heats up fine...maybe a little slow, but it doesn't over heat. So I'm assuming the Thermostat is stuck open. Either way I think I'll leave that until the spring to replace and just keep an eye on the temp.

As far as the 1193 code, have you guys seen that before? I found some cheap, new MAF's on ebay for $75...which is way better than the $300+ that Bav Auto is selling them for. Since then, I've cleaned the MAF with MAF cleaner and I kinda think I'll just wait it out to see if the codes disappear after a few weeks.


The car runs normal. It seems exactly the same as it always has...just that dumb SES light.

Am I right in thinking all this? Would you guys have any recommendation as to what I should do?

Thanks!
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Old 01-13-2010, 12:48 AM   #2 (permalink)
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