CEL (P1117), Any Advice?

[ddb]

Hello All,

My check engine light came on yesterday towards the end of an 1 hour cruise in my 2000 Boxster (67,000 miles). Earlier this year, I had a CEL (1128) that I reset after filling up with gas and a bottle of Techron. Until now, no problems. When the light came on yesterday, I was sure it was 1128 again. I bought a code reader this afternoon and found P1117 Fuel/Air Mixture. Anyone have any advice on where to begin with this code? As far as I can tell the car is still running good.

Thanks in advance for any help.

ddb