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This seems as thou your cars cambelt teeth is striped and is no longer turning the camshaft. To repair this you will have to remove the cylinderhead and repair the damaged valves as they would have hit the pistons which is causing the lock-up that you are experiencing at the moment. To test this you can use a wrench and socket (19 mm) place it on the crank shaft pulley. Try to turn the engine by hand. If you can not turn the engine all the way round the valves are coliding with the pistons.
This should answer your question but if you need more information do not hesitate to ask.
Your car does not have a timing chain. It has a rubber belt driving the camshaft
Oops I made a mistake thinking that your car was a 2.0 l and not a 2.5 l
Yes your car does have a chain and you will have to remove the engine to repair this problem.