2008 Hyundai Sonata check engine light - Page 4 - Hyundai Forums : Hyundai Forum
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post #31 of 42 (permalink) Old 02-05-2019, 03:41 PM Thread Starter
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I removed the throttle body valve and gave it a good cleaning with mass air flow sensor spray fluid. It was quite dirty but whe I put it all back together the light was still on. Do I need to get it reset or can I just take the neg. side of the battery off for a while to accomplish that? Also I lost a lot of yellowish sweet smelling fluid that I assume is coolant fluid.
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post #32 of 42 (permalink) Old 02-05-2019, 04:18 PM
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If you don't ease the trouble code with your scan tool the light wont switch off straight away. It should switch off after two drive cycles if the PCM doesn't see fault again in that time. I wouldn't advise disconnecting the battery to erase the code. Sometimes that can cause other problems.

The throttle body itself usually needs to be reset after cleaning. I don't think you need a scan tool to do that on a Hyundai engine though. I think it's something simple like switch the ignition on for at least 10 seconds without starting the engine, then switch the ignition off for at least 10 seconds. Maybe @sbr711 can confirm.
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post #33 of 42 (permalink) Old 02-05-2019, 05:28 PM
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Key insert to cylinder, rotate "ON" for maybe 1-2 second and right back off

Leave it sit for 60 seconds to be sure

Key on,, wait,, then start...... see what happens


Codes this time around ??

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post #34 of 42 (permalink) Old 02-06-2019, 03:52 PM Thread Starter
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Well that did not work. I turned the ignition on for 15-20 seconds then off a few times and the code is still on. I will try to get it reset at Autozone. I do not know what to do next. Mass airflow sensor changed, mechanic (supposedly a good one from recommendations I got) charged me to tell me he checked all the wiring and it points back to the MAF. Could it possibly be it needs a Hyundai OEM part? I am open for suggestions.
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post #35 of 42 (permalink) Old 02-06-2019, 05:21 PM
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Well that did not work. I turned the ignition on for 15-20 seconds then off a few times and the code is still on.
Turning the ignition on and off was to reset the electric throttle valve. It wasn't intended to erase the trouble code.

Have Autozone erase the code then we'll see if it comes back again. hopefully not....fingers crossed.
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post #36 of 42 (permalink) Old 02-06-2019, 07:30 PM Thread Starter
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Ok, sorry about that, I thought you meant that was how to reset the code. I was going to do the battery thing but you say you do not recommend that so I will take it to Autozone. Fingers and toes crossed.
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post #37 of 42 (permalink) Old 02-11-2019, 05:04 PM Thread Starter
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Auto zone or Riley auto parts will no longer reset codes. They will read your code but not reset them. I really think I am going down the wrong path. I saw a video by some mechanic who said if you disconnect the connector to your maf sensor and it makes no difference to how the car runs then look for something else. I have done that when the engine is running and it has no effect. When I start the engine there is a little hiccup for a few seconds but with a small press on the gas peddle it settles out. The car runs fine on the road. I really have to sell this car soon but I can not even advertise until I get this fixed. Any other suggestions?
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post #38 of 42 (permalink) Old 02-11-2019, 05:06 PM Thread Starter
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It is not a 3.3 as I had said in my profile that I will correct. It is a 2.4 GLS.
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post #39 of 42 (permalink) Old 02-11-2019, 06:32 PM
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Auto zone or Riley auto parts will no longer reset codes.
Buy an OBD II code reader and erase the code yourself then. You'll probably find a cheap code reader at you local walmart for less than $20. And if you can afford to spend maybe double that you'll probably be able to buy a proper scan tool that will allow you to view engine sensor data too.
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post #40 of 42 (permalink) Old 02-11-2019, 06:43 PM Thread Starter
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I paid a mechanic for a 1 hour diagnosis and he said everything points to the maf. Is an maf for a 2.4 l different than 1 for a 3.3 l? I still it possible it needs a Hyundai OEM part?
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