I have a CAN1010 TAG AQUARACER CHRONOGRAPH and whe reset it the second arm doesn't reset to 0 but instead stops 2 seconds before..

You need to go to a watchmaker. Sorry, I am good but not good enough to diagnose the damage without seeing the watch. In any case you can't fix yourself unless you are a watchmaker.

Go to http://www.tagheuer.com/the-collection/aquaracer/man/calibre-s-chronograph/index.lbl?w=CAF7110.BA0803 and you will see your watch? and on the right is a menu with "user manual" in it. Down load the manual.

Great watch! Operation should be pretty straight forward. The top button starts the chrono and stops it. The bottom button resets it. To calibrate the sweep arm into the right position pull the crown out to the first or second set position and press the start button until the sweep arm is in the start position you desire. This is typically 12:00 or 0.
If your chrono is not working then have the battery checked. If the battery has been recently replaced then make sure the watch doesn't need to be cleared.
I recommend you take this to a watch maker/technician who will be familiar with the service requirements of this model including resealing and pressure testing the watch to be sure it is sealed to its marked water resistance specifications.

Thanks!

I love these watches, don't you?

Your TAG is fitted with EOL (end of life) feature. This is the cause of that 4-5 seconds interval movement of seconds hand and thus indicating the time for battery replacement. The timekeeping is not affected by this- it is just warning to replace battery a.s.a.p.
Find your nearest watchmaker and ask for battery replacement.

Do not forget to rate, please.

They were just hiding it:
http://ww2.tagheuer.com/_documents/manuals/EI2252_en.pdf

-Tha Mp3 Doctor

THANK YOU THANK YOU THANK YOU!!! I had a similar issue and this saved me!!!!

I have CL1180 and had the same problem, pulling the winder out to position 2 (fully out) and using the buttons resets the second and 10th second hands and putting the winder in position1 and using the buttons does the same for the minute and hour hands. However finding position1 was tricky, only seems to work on the way out from fully home and not on the way back from pos 2.

Hope that helps.

Try setting the crown to position 2 - i.e. the position normally used to adjust the date.  Then use the top and bottom stopwatch buttons to adjust the minute hand and 1/10th hand respectively.