Is this normal? I got into the car this morning and the check engine light was on....This is without the key in the ignition. I drove it to work and the light went off as I started the car.

...Just got home and this time the light was on all the time I was driving. The diagnostic light bleeps 5 times which I hear means the O2 sensor...(I replaced it less than 10k miles ago??)

Should the light be on all the time even when the key is off?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k