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 Problems

Noise on Startup Due to Failing Timing Chain Tensioner

If you experience excessive engine noise on startup (after the engine has been turned off for several hours) that lasts for more than five or six seconds, turn off the engine and check that the engine oil level is correct. If the oil level is correct, the noise may be caused by the timing chain tensioner. Hyundai has an improved tensioner to correct this problem.

Rough 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.

Check Engine Light and Transmission Won't Shift Correctly

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.

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2004 Hyundai Sonata Questions

brake light won't turn off (1 answer)

DC Emissions says the car has 4 sensors that needs to be changed. Can you please give me the specific part numbers for the sensors? With warm regards, (1 answer)

This was my reading when it went through Emissions.
Monitors Not Ready:
Catalyst
Oxygen Sensor
MIL Remains lit at key-on-engine-running
MIL Commanded On
1 Trouble Code Reported:
P0056 HO2S Heater Circuit Bank 2 Sensor 2

What is causing the ABS & Hand Brake light to stay on on my instrument console. (1 answer)

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.

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2004 Hyundai Sonata Recalls

Recall 09V124000
HYUNDAI IS RECALLING 188,282 MY 2001-2004 SONATA AND MY 2001-2004 XG300 AND XG350 VEHICLES ORIGINALLY SOLD IN OR CURRENTLY REGISTERED IN THE STATES OF CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, IOWA, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK...

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2004 Hyundai Sonata Reviews

It has been a pretty good car so far. It has almost 200,000 miles on it and runs good, sounds good. Also it gets up to speed. I have a v6 engine and the gas lasts me for a while as well. The only thing I have had to replace is the starter and the typical things like plugs, oil changes, other tune up stuff.
This car is a nightmare for me. I brought this car new and the car is now going on 8 years old and it has so many problems. I took it to my mechanic the other day and he informs me that I need: rear hub bearings, a rack, injectors and IAC (whatever that is). Also, my timing belt needs replacing. My car has approx. 120,000. I should have brought a Nissan like my family always did. When I ...
The 2004 Sonota has got to be the biggest nightmare I have ever owned. I purchased it brand new in 2004 and by 2005 the clutch had to be replaced. Then by 2007 the flywheel, clutch, rear suspension, front axel and transmission all needed replacing. This car is still sitting in my garage and had been since 2007. The only good parts of the car would have to be the body and interior since it was...

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