Question about 2005 Hyundai Sonata

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Check engine light stays on.

I have 05 hyundai sonata v6. Had battery and alternator checked a month ago and was told the battery was bad, so I replaced the battery has more power,from 600 to 825. I was also told that the 825 would be a better battery for the car. Car drove finr for a month. Now the check engine light comes on upon starting the car and missing, if it idles to long ( 1 min) it cuts off. Please tell me whats going on and is it very costly?

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  • Anonymous Jan 10, 2009



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Can't really guess with these car the computer that puts on this light is very sensitive and is very accurate. Here is my suggestion take your vehicle to an AUTO-Zone they will check why the engine light is on for FREE. make sure you get the code or codes and their meaning and get back to me if you need more help. Good Luck

Posted on Dec 27, 2008

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How do you know if alternator is bad on a 2006 hyndai sonata v6

Using a volt meter check the voltage at the battery with the vehicle running. There should be more than 13.5 volts. If it is more like 12 volts or less that the alternator is not working or there is an open between the alt and the battery. The most common cause of the battery light is a bad alternator.

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try this! start vehicle, while it is running remove the negative cable from battery. if it stays running the alternator is good. make sure battery connections are clean and tight. if checking alternator at battery, and you know its charging. then it has to be a short in wire from the alt. if the engine dies when testing as above. its either a bad alt, or a bad wire. or bad ground. good-day!

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2002 Hyundai Sonata

Loose wire connections must be checked first.
Here is the simple way to check if the battery is discharged: Turn the ignition on, with the engine off, switch the windshield wipers on. If they move way too slowly, much slower than usual, the battery is probably discharged.
As the battery is relatively new, it can be recharged. All you need to do is to boost your car and let the engine run for a while to charge the battery

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