Check Engine Light - CRX
 

The Check Engine light on my CRX came on this morning. I was going up
a small hill, and the engine wasn't warmed up yet. After my drive, I
restarted the engine and drove around the parking lot - the Check
Engine light was off.

Is this something to worry about? I just got a new O2 sensor, about 7
months ago (and since then, it seems I have less power, and less mpg
as well).

TIA