I've got a My01 2.5 RX auto that I had serviced roughly about 2 weeks ago. I know that usually the check engine light turns on during ignition but eventually goes off. Today it stayed on for a bit longer, even to the point it was still on when I drove out of the garage/ parking lot. I did notice that it only turns off when it reaches it's usually operating temp (half-way on temp gauge).

Car never used to do this but the service did include a full flush out of fluids (oil, coolant, brake fluid), new trans fluid filter, oil filter, fuel filter etc. As I said earlier it was about 2 weeks ago since the car has been serviced and the check engine light never came on during last week. Car seems to be behaving normally though.

Is it the car just getting used to the new fulids and filters or is it something I should be worred about?