2009 mks: Po150

intechdude281

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Jun 2, 2013
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Detroit
Occasionally the MKS gets a MIL (almost ALWAYS after fueling up...) which I checked to be PO150 - O2 Circuit, Bank 2, Sensor 1.

The car runs fine, no noticeable issues, or loss in fuel economy. I find it odd that the MIL comes on typically after refueling, and isn't constant. It hasn't come on for almost 8000 miles, but today it came back on.

Any suggestions for what I should check before going to the dealer?
 

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