beside the massive dent i have in my car

i put in a pod filter replacing the box but i didnt put hte lil temp sensor in,is that gonna stuff up my ecu and effect someting???? and like wehn im doing like 100kms without the overdrive button on and i fully step on it and then just drop the pedal, the car kinda kicks is that meant to happen, it doesnt do that when i have overdrive on though, Oh yeah i took out he old muffler and put in 4inch cannon could that be effecting anything too. oh eyah and when i fully turn the wheel it clicks is that bad. man my carmys hell stuffed to the max. im just worried about the kicking when i drop the pedal. Hey wat does the ETC power button do is that meant to keep ur revs high apperently i dotn know i dotn haev a rev meter, oh one more thing if i have overdrive button on at 60kms is that using up more petrol then if i dotn have it on. My friend siad if u have it on at 60 u use up more petrol but itsok to haev it on wen ur doing more then 80ks. i dont know

You need all of the sensors for the engine to operate properly.The check engine light will probably come on.The overdrive button is just like another gear (4th gear).The wheel clicking is a cv joint.It is usually more cost effective to replace the complete axle with a rebuilt unit.The ECT button controls the shift points in the tranny.You use LESS fuel with the O/D on at all times.