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      08-23-2016, 12:07 PM   #1
airmarc
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Chasing a gremlin? CEL light

Greetings all,

Late model 2009 Z4 30i. CEL light came on about a month ago, took it to my local indie and they replaced the gas cap (code P0456 micro vapor leak). Last week CEL light came back on. Same code. Seems after about 250 miles or so, the car checks itself again for leaks. They did a standard smoke test and various other tests and didnt find the cause. Anyone have something similar?

Any ideas or suggestions are happily appreciated.
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      08-24-2016, 08:43 AM   #2
rking117
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Hmmm getting the code here is the best solution for sure. Gas caps seem to be a common issue with newer more sealed fuel reservoirs. But since you just replaced it i would next suspect the sensor instead if that is the same code. If the code is different though you will obviously go down that path instead. Keep us posted.

Sure wish we could buy a Chilton manual like we used to with domestic cars to work on these things. I relied heavily on those years ago when i had a domestic. I know that they have them but it seems like it takes them 10 years to get one for BMW and it only covers the 3 series.
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