well i've had 2 technicians look at the CEL's so far. both work at my dealership (bobby rahal honda)...the first guy said he thinks it's the 02 sensor (when i first got the CEL about my "warmup cat") and the 2nd guy thinks that it's the MAF, but i didn't have the 2nd tech look at my car until it started running like s*** on me. sorry to confuse you guys lol.
as far as my first 02 sensor goes, the first tech thought it needed replaced and he's probly right since it's all covered in electrical tape. however correct me if i'm wrong, but i thought the MAF controls how much fuel my car gets, and the 02 sensor's just monitor it right?
edit: p0420 does sound familiar