OT: Dreaded CEL in my DD, Got the OBDII code Options

[flipb]

My daily driver is a 2007 Kia Rondo, 2.4L 4-cyl. I bought it new and I've put 50K miles on it.

About a week ago, the Check Engine light came on. I decided it was time to own an OBDII code reader, so I went out and bought one at my FLAPS.

I hooked it up and it gave me the code P2187: System too Lean at Idle Bank 1

I presume the "Bank 1" part is the default for an inline engine.

I figured it was an anomaly and cleared the code. Within 2 days, the Check Engine Light was back on, and giving the same code. This time, I didn't clear it (so the light is still on every time I drive... much like every NYC taxi.)

I can discern absolutely no difference in the way the engine's running, sounding, or driving. I suspect the weather may be a factor - both times the light came on, it was a fairly cold morning. I'd be more concerned if the diagnostic code implicated a particular faulty part, such as an O2 sensor.

Should I worry? Should I clear the code? Should I get to a dealership soon, considering there's a 10yr/100Kmi powertrain warranty?

[underthetire]

Being obd 2, you probably have multiple o2 sensors, usually 2 befor the cat and one after. Since it happens on cold mornings, I'm guessing the heater element is not up to snuff in one of the o2s before the cat.

Take it in before next smog check.