Over the weeken I disconnected and removed the battery to get access to the air filter.
I re-installed the battery and changing the oil.
Now intermittenly for 15-30 second there is a beeping noise, like when the door is open with the keys in the ignition.

No warning lights come on with the beeping.
Any help to identify the problem is appreciated.

 

When it beeps look at your gauges and see if any of them are low/high out of range.