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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Re: check engine light stays on.
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
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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.
The engine is rubber mounted and so will move about during acceleration. It could be the movement has caused loosening of one of the alternator terminals or perhaps the alternator wiring was badly routed and some sharp edge has worn through the insulation.
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!
It sounds as though the speed sensor has not been plugged back into the gearbox.it will trigger the eng check light.We used to call this sensor the 'speedo cable and head'years ago when it was a mechanical drive to the little gear in the top of the gearbox.Now that it is computer based it just has a wiring loom to a plug on this drive head.You should be able to see it at the back and top area of the gearbox.It usually is held in by a small 10mm bolt and the plug should be part of the wiring loom running by it,Just reach and refit the plugIt will only fit one way.Sometimes access can only be made by loosening the ducting from aircleaner to engine that runs above it.The check light should go out though the code may stay logged,if the light stays on but the speedo now works,dont worry.At some stage you will need to get to a garage that can reset the light,but it isnt life threatening.Removing the battery cable for a few moments generally wont clear these later OBD2 type systems.Hope this helps....oh you could always go back to the garage that did the job,armed with this knowledge and get them to do it while you wait,it wont take long to do.
The Alternator may not be charging at the proper level. If the car is running while you're trying to open the sunroof or turn on the defroster, then the battery light has nothing to do with those and they are separate problems. Have an ASE Certified mechanic check the charging system.
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