On the way to work this morning the dreaded SES light came on. At lunch, I had it read by a buddy and it popped 1641&42. We tried to clear them thinking it could be nuissance fault, but they popped right back up. The engine sounds/runs fine as far as I know. Any help would be appreciated. Thanx

 

Got a fan switch? That is a common cause of the codes.

 

no, It's the weirdest thing. Ijust came off of deployment a couple weeks ago, and everything was fine until this morning. Other than a quick fluid check, I haven't been under the hood since I've been back