Part identification please

[kevrobert]

Emmission control switch??
Rear of manifold, looks a little corroded so would like to replace but need ID.

[kdjones2000]

Must be a Euro spec car.

That is for the O2 sensor, which has been deleted in your case.

[sausagehacker]

Are you talking about the blue thing plugged into the head? Yes, it's a thermo valve that opens when the coolant is at a certain temperature. I think it allows vapors from the fuel tank into the charcoal canister.