Engine coolant temp sensor you mean?
YES!! thank you!! anybody know what #24 in the pic is called? thanks alaskab16My bad. You mean #24?
Or simply just the FIACV.Fuel injected air control valve. Also known as the FIA control valve.
basically, it helps burn exhaust gas a little better by introducing fresh air to the exhaust. it's supposed help prolong life and efficiency of the catalytic converter. it won't hurt anything, just emission s**t.