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This page will list all the Check Engine Light questions and answers asked of us pertaining to Hyundai vehicles. Some Hyundai models include Accent, Sonata, Santa Fe, Tiburon, and others.

Question: I have a 2008 Hyundai Sonata with a P0011 check engine code. The dealer replaced the oil but the P0011 code came back. Help!

2000 Hyundai AccentQuestion: I have a 2000 Hyundai Accent. The check engine light came on. I took it to Auto Zone and they said the catalytic converter is clogged. I have never heard of this. They did not give me the code. I have scanned code lists and have not found one that indicates a clogged catalytic converter. Does this diagnosis make sense to you? - Bill, January 2009

Answer: Hi Bill. There are no codes that specifically state that the catalytic converter is clogged. There are codes, however that show up as a result of the converter being clogged. Make sense? What I'm saying is if the converter is clogged it will trigger certain codes such as a P0420. Now, just having that code doesn't necessarily mean the converter is clogged, but that is the most likely culprit. Please have it properly diagnosed before replacing the catalytic converter though (it's expensive!) to be sure that's the problem. Also, be aware that a cheap aftermarket converter will not last nearly as long as a quality Hyundai replacement part. With that said, I would recommend you get the codes and look them up yourself prior to any of that. I'm surprised they didn't actually tell you the code(s). Good luck.

2003 Hyundai Tiburon GT V6Question: I have a 2003 Hyundai Tiburon GTV6 with a 2.7 litre V6 engine. I installed an AEM cold air intake a few years ago and the check engine light came on then. After a couple of weeks, the light went off and never came back on until recently. The car is running just fine. I can't tell the difference, but I'm trying to sell the car right now so that's a problem. The code is P0174 - system too lean (bank 2). My understanding is that too lean means that there is too much air and not enough fuel in the mixture. I was thinking this could just be from the more airflow coming in the cold air intake and causing the computer to to think something is messed up. Do you think this is a correct assessment? Is there anything else it could be? Is there anything that I can do to make sure the light doesn't come on again assuming it resets itself soon? - Jeremy, September 2008

Answer: Hi Jeremy. The P0174 code could be caused by a few things. Take a look at this [P0174] article. I would suggest cleaning the MAF sensor and checking for air leaks on the CAI kit (downstream from the MAF). You could also have a vacuum leak. Based on the fact that the light went off for years it could be something different. Also take a look at this Mustang post (similar deal, CAI installed P0174 code) - [MustangEvolution]. Good luck!.