One problem related to engine exhaust system has been reported for the 1999 Hyundai Sonata. The most recently reported issues are listed below.
When the check engine light illuminated, vehicle ran sluggish, and then stalled. The dealer replaced the oxygen sensors four times within the last three years. The problem was still occurring and happened more frequently. Based on consumers assumption, the vehicle was having the same problems as described in NHTSA recall 00v259001 concerning stalling. This vehicle was not included in the recall due to VIN.