basically was on my way home from work when the cel came on, and I was like wtf, (it was also snowing).
Anyway I pulled the codes for p0108b map sensor circuit high, and p0420 cat efficiency below threshold. Now th ecar has a prm intake and invidia catback, but they have been on there for 1 year without a problem, so I don;t think its that.
I cleared the codes and light, and haven't seen it since in about 20 miles of driving, so what i does it mean and should I worry???????????

 

Don't sweat it for the time being. If the CEL comes back on, then figure it out...

Could be as simple as a computer hiccup... Or a bad tank of gas.