2004 Hyundai Sonata Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2004 Hyundai Sonata
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2004 Hyundai Sonata ProblemsCheck Engine Light Due to Faulty Accelerator Pedal Position Switch
Problems with the accelerator pedal position switch may cause the Check Engine Light to illuminate; an improved switch is available to fix this problem.
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.
2004 Hyundai Sonata Questionsbrake light won't turn off (1 answer)
This was my reading when it went through Emissions.
Monitors Not Ready:
MIL Remains lit at key-on-engine-running
MIL Commanded On
1 Trouble Code Reported:
P0056 HO2S Heater Circuit Bank 2 Sensor 2
When I start the car from a cold start the ABS & Hand Brake Light goes off. After a warm start the ABS & Hand brake light stays on.