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Discussion Starter · #1 ·
50,500 miles, traveling on the highway at about 50 mph in the middle of a torrential downpour. I was actually looking at the cluster when the engine light came up.

Called onstar. Said it was P20EE.

Wonder if the rain had anything to do with it?
 

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NOx Bank 1 catalyst efficiency sensor.
 

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50,500 miles, traveling on the highway at about 50 mph in the middle of a torrential downpour. I was actually looking at the cluster when the engine light came up.

Called onstar. Said it was P20EE.

Wonder if the rain had anything to do with it?
I am going to vote for coincidence.
 

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Discussion Starter · #4 ·
When the car was started yesterday the MIL did not illuminate.

So whatever it was has now gone away.
 

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When the car was started yesterday the MIL did not illuminate.

So whatever it was has now gone away.
Interesting. I wonder if it will come back.
 
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