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Last week after a short drive, I heard a dreadful 'bang' and I could see the CEL glowing in the dash. Also in the info display, it showed 'Check Emission System'. I immediately proceeded to turn the key two clicks w/o starting the engine. Pressed the 'info' button, but the 'message' choice was greyed out. No way to check. Then I enter that secret menu and looked for diagnostic code. No code. Then I repeat everything again with engine started and shifter in 'Park'. Same thing.

The CEL continued to show in the next 3 or 4 drive cycles. However, it went again by itself later on. After that, I have driven more than 100 miles and the CEL did not come back. I am really confused as to what is going on. Has anyone experienced the same thing before?
 

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Not on my X, but on other cars. If you can access a code reader capable of showing archived codes you should be able to see what it was.
 
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