(Edited by Moderator)
No check engine light and no codes on my reader.
Bought it brand new, no water inside.
The problem is worse the warmer the weather.
Also, after changing the battery it has not reset the readiness codes but I have been driving it very little. (when key is turned on engine light comes on about 20 sec then blinks 5 times)
Is there a possibility there could be some kind of intermittent alternator fault once it gets hot?