Seafoamed yesterday; fabulous and perfect. Today my CEL comes on and it's throwing P0641 (Sensor Reference Voltage A - Circuit/Open).

I don't even find this code when I search the forum. 😕 I thought most seafoam codes were for misfires ... ???

2008 base, automatic, 102k miles

Thanks!!

 

Did you accidentally bump into a sensor or cable and loosen it? That's where I would start, making sure everything is connected and seated properly.

 

Can't find anything loose or disconnected. Reset the code and will have to see what happens driving around tomorrow, I guess. Fingers crossed! 😏

 

Had to go pick kiddo up from a ball game and got the CEL again. Checked it when I got home and now it's a P2187 - system too lean at idle.

 

I can only guess it's seafoam weirdness and the car being able to breathe again. 😉 Codes went away, so that will do!