Has your Hyundai / Kia check engine light come on? Is it flashing? Why is my Hyundai Accent check engine light blinking? Chances are you have had a engine misfire due to bad spark plugs or ignition coils like I did.
These are fairly straightforward to fix and do not require much time; however, if you do not fix these it can lead to engine damage. Especially to your catalytic converter. To be sure, plug in your OBD2 scanner tool to figure out the code for the engine misfire (if you don't have a scanner yourself, you can go to AutoZone and they will do it for you for free).
Once you have determined that it is a cylinder misfire, it is time to change the spark plugs and/or the coils. Spark plugs generate the spark to ignite each combustion event within the car's cylinders to provide the car with power (which is why you might feel you have less power). Spark plugs that come with your vehicle are made to last about 100,000 miles usually, but will sometimes wear out more quickly. They are cheap and range in price from $2-20 depending on how long you want the replacements to last. So try and replace these first (do all of them at the same time).
Tools & Parts Required
To do so follow the instructions below (and see the attached video):
After replacing the spark plugs turn on your Hyundai / Kia engine. If you have fixed the problem, then the check engine light should stop blinking and the engine should run more smoothly when it idles and you will have recovered power.
The check engine light may persist for a few days but should go away. If this did not solve your problem and you still are getting a blinking check engine light or any of the above-mentioned symptoms, likely you have a defective ignition coil.
You now know how to replace these, and they usually will cost anywhere from $15-40/coil. Fixing this problem is straightforward, will save you money, and will improve your car's performance.