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Re: 2002 hyundai accent codes p1529 and p0734
P1529 means nothing more than the TCM (transmission control module) has
requested that the ECM (engine control module) turn on the check engine
lamp. P0734 basically indicates that your transmission is slipping. You need to take this car to an authorized repair center for hyundai cars. Replacing the filter and fluid on the transmission might save this transmission but I would be willing to bet that a total transmission rebuild is in order.
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Sounds like the transmission is trashed to me. You might try flushing the transmission fluid a couple times to see if that can help the problem (I would have it done with an actual transmission flush machine)
Other than that, all I can say is DIG DEEP my friend!
P0734 = 4th gear incorrect ratio (that's the torque converter 'lock-up' clutch - inside the converter). P1401 = doesn't exist for 2002 Hyundai Accent's P1401 exists for 2000 Accent = DM-TL Air Pump Motor Curent Draw is higher or lower than expected (normal is 17-36 mA). DM-TL = Diagnostic Module for Tank Leakage & is part of the Evaporative Emissions Control System.
These two DTC's are not associated/part of the Accent's Engine Managemenet System (EMS). Best to have a qualified/certified Hyundai Service Technician properly diagnose this starting problem with your vehicle.
Sounds like a dirty of faulty speed sensor. They can be removed and cleaned. Better off replacing. Do check the wires to the speed sensor. Trace wires from tranny to instrument cluster and make sure they are all in tact and clean.
po 734 is transmission code, unfortunatly its not good, an internal failure, probably a kickdown servo failure,hyundai offers a reman trans, with a good warranty i would look into that, also they will give you a better diag and options on what you have, however if you are the original owner, and have proof of proper maintainance,the trans may be covered on the 10 year 100,000 mile power train warranty
P0734 - 4th gear incorrect ratio. P1529 Malfunction Indicator Lamp Request. Problem is in the transmission.
Take/Tow your vehicle to an authorized Hyundai dealership and pay the diagnostic fee... they will tell you exactly what the problem is and the cost of parts/labor to fix it... at least this way you'll know what the problem is and what's required to fix it.