Since its introduction to the United States market in 1989, the Hyundai Sonata has steadily built a sterling reputation in a mid-size sedan market that has major competitors such as the Toyota Camry and Honda Accord. However, the earlier Sonata models are used-car buying risks, particularly for their transmissions.
Transmission Failure
Two model-year entries of the car's first generation of production--the 1991 and 1992--are susceptible to transmission failure, which requires a rebuilt engine to fix. This affects the Sonatas with the optional four-speed automatic transmission, rather than the ones with the standard five-speed manual.
ISS Sensor
Hyundai Sonatas from the mid-'90s and 2000s generally do not have frequent problems. With the 2000 and 2001 model years, however, customers should watch out for the failure of the input shaft speed (ISS) sensor in the transmission, which causes the "check engine" indicator to illuminate.
Repair Costs
As of September 2010, the cost to replace the transmission of the 1991 and 1992 Hyundai Sonata with a new one is approximately $2,200 for parts and $325 for labor; a rebuilt one costs about $150 for parts and $825 for labor. For the ISS sensor, the cost is estimated at $61 for parts and $26 for labor.
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