2005 Sebring conv.-check engine light & code 0129

2005 Sebring cinv, 2.7 v6. Started the car to come home from work and got a check engine light. Drove home. Code reader gave me a 0129 code. My code reader doesn't list this code. Help!

Thanx in advance

Think I figured it out. After checking all that I could around the engine compartment, I went for the gas cap. It wasn't loose, but it seemed like the cap attachment strap interferred with the threads on the cap. I reinstalled the cap more carefully. This morning, no more 'check engine' light. Coincidence? Maybe, but she seems to be running fine now.