I have had the transmission rebuilt in my 2002 Hyundai Accent GL only 8 weeks ago and I have gotten the codes P0734 and P1529 now. So does that mean my mechanic did not do his job?

no take it back to the rebuilder no take it back to the rebuilder

Is your DTC p0723 (2 to 3rd gear ratio, off top of my head)? If so try the speed sensor, it is about $50US else it is rebuild time is my guess. This what happen to mine. Note the advice is free for what that is worth. On 2nd try with junkyard trannies. Like the guy said they are throw away cars and I have read where rebuilts only last a year ($700us) but there is a place in San Berdo.. (around pick a part) which will give a 3 year for $1800 you install it. But the car does get 45mi/gall, best. I got 150K miles on the tranny and used dextron in the last 30K. I think that is what kill it plus a cartop carrier and moving wood panels. Stick with the factory oil or atf 3, chrysler since it is their tranny.

Try this forum
Hyundai Accent Transmission Questionshttp://townhall-talk.edmunds.com/direct/...

I might be stupid and try to rebuild one but one one guy rebuild one on these forums with success (at least he has not reported any failure with his rebuild) but he also advises not to do it because he had to pull it 3 times taking apart the tranny also. His problem was documentation and he used 7 quarts of spIII at $7/quart. I will use Dextron III until it operates cprrect;ly then drain it putting in the Walmart equivlent of spIII until the dextron mix is down to 10% of the Walmart oil. Oh well I already got the tranny out and 3 books on it plus another junkyard trans. I got more time because the economy is south so wish me luck. Is your DTC p0723 (2 to 3rd gear ratio, off top of my head)? If so try the speed sensor, it is about $50US else it is rebuild time is my guess. This what happen to mine. Note the advice is free for what that is worth. On 2nd try with junkyard trannies. Like the guy said they are throw away cars and I have read where rebuilts only last a year ($700us) but there is a place in San Berdo.. (around pick a part) which will give a 3 year for $1800 you install it. But the car does get 45mi/gall, best. I got 150K miles on the tranny and used dextron in the last 30K. I think that is what kill it plus a cartop carrier and moving wood panels. Stick with the factory oil or atf 3, chrysler since it is their tranny. Try this forum Hyundai Accent Transmission Questions http://townhall-talk.edmunds.com/direct/view/.f13a660/0 I might be stupid and try to rebuild one but one one guy rebuild one on these forums with success (at least he has not reported any failure with his rebuild) but he also advises not to do it because he had to pull it 3 times taking apart the tranny also. His problem was documentation and he used 7 quarts of spIII at $7/quart. I will use Dextron III until it operates cprrect;ly then drain it putting in the Walmart equivlent of spIII until the dextron mix is down to 10% of the Walmart oil. Oh well I already got the tranny out and 3 books on it plus another junkyard trans. I got more time because the economy is south so wish me luck.