The timing chain tensioner for the 1.6L engine? If so it has two. One is located behind the inspection panel located above the fan belt main pulley just under the valve cover. Two nuts and a six 10mm bolts hold it in place. It is sealed with silicone engine sealant.
Support the engine from underneath and remove the top motor mount for easier access.
Two bolts hold it in place. Auto parts stores sell it for around $50.
The second tensioner in found in the lower block area behind the timing chain cover/ water pump. That tensioner is made up of two components. The spring tensioner which can be removed from the engine easily. Remove the two bolts on the side if the engine directly behind the water pump output and it pulls right out. The other component is the nylon tensioner track or guide that actually pushes against the timing chain. That is the part that wears out and requires the cover to be removed. To remove the cover you have to remove all the 10 mm bolts including the two in the top from the head and two in the bottom from the oil pan. There is also two 12mm bolts near center the cover near the water pump. Removal of this cover my damage the head gasket part that seals the head above to the cover. I have always pulled the head off the engine and replaced the head gasket when opening the timing chain cover. I don't know if it is possible not to without causing oil leaks by not replacing the head gasket.
Here is a link to a photo showing the upper cover removed.
http://www.Flickr.com/photos/92225127@N00/534508640/in/photostream/
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