1999 Hyundai Sonata Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1999 Hyundai Sonata
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1999 Hyundai Sonata ProblemsRough Idle Due to Faulty EGR Switching Valve
On the 2.7L V6 and 2.4L 4 Cylinder, a defective exhaust gas recirculation (EGR) switching valve may cause an intermittent rough or unstable idle engine.
If the automatic transmission does not shift properly and the Check Engine Light illuminates, the speed sensors in the transmission may have failed. The sensors are simple and inexpensive to replace.
Premature timing belt failure may result in serious engine damage. When replacing a broken timing belt, it is important to inspect and possibly replace the crankshaft position sensor; it is often damaged when the timing belt breaks.
1999 Hyundai Sonata QuestionsFailed smog. Told needed to do a drive cycle. Unable to find correct one. (1 answer)
tried 2 different ones. Did not work. Any suggestions? Catalyst & 02 sensor not ready. Should I unplug the ECU as mentioned to someone else?
it also has a low shortage of power which prevents windows from opening or clock in car to stay on.this vehicle uses up gas up to 3-4 times a week to refill tank