Depends on how bad the piston is. I would ask you what the symptoms are that has made you feel the problem is a piston. It might be something else. Pistons don't usually give trouble in modern engines but all sorts of other things do. If the engine is misfiring then it's almost certain to be something other than a piston - maybe fuel system or electrical system.
no, you have bad piston rings
Worn piston rings will cause your car to burn oil. It will smoke, and you'll have to add oil frequently. Additionally, the performance will fall off as compression is lost past the worn rings. There may be a "slapping" sound as the piston skirts slap the cylinder walls, and this will occur in cases of advanced ring wear.
bad piston rings or a bad cylinder all together look up a rebuilder bad piston rings or a bad cylinder all together look up a rebuilder Worn piston rings and or bad valve seals. Could be from high mileage or poor maintenance either way there is no cheap fix.
Bad piston rings allowing oil into the combustion chamber.
piston rings going bad oil leaking around to top of piston so when you start the oil will burn white
One of the parts in the piston are the piston head,
bad valve seals, bad piston rings bad valve seals, bad piston rings
The bottom of the piston is connected to the crankshaft. This is what is moved by the piston. The top of the piston is a chamber in which gas is ignited to push the piston down. There are 4 cycles in most engines (like car engines.) If you want to know more, including specifics, go to: http://en.wikipedia.org/wiki/Four-stroke_engine
The engine had a bad piston
your getting oil into your exhuast that's why it smokes bad rings on piston or valves sticking
Check engine light on? Have vehicle scanned to determine the problem Bad spark plug or wire? Bad valve? Bad piston? Vacuum leak? Do a compression test
because somewhere you are "leaking compression" with bad piston rings, intake or exhaust valves or similar.