Electrical plug ID help

[Rugby]

Last weekend I changed the valve springs and pulled the cam señor to check it out. I have 2 plugs right by the cam sensor that I could not figuar out where they went.

Both are single wires. One has a round connector and the other is flat.

I know there are 2 plugs that hang out behind the alt and these are not them.

Brandon

 

[dynoman]

The round one is for the O2 sensor , not sure on the other .

 

[Nick Micale]

The flat one is for the water temp sensor which goes to the overheating idiot light, the round one is for the O2 sensor.

 

[Rugby]

If the o2 sensor was unplugged would it cause a check engine light?

 

[earlbrown]

It would throw an 02 code