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On a lot of cars the light is reset when you get an oil change, air filter etc. It's overdue for a "look see". You can always go to advance auto and borrow the code reader for free. Plug it in under your dash and will read and reset any codes
Have you checked the spark plugs since the light came on? you say that you belive they caused the light to come on? If this is true, are you sure that you spaced them properly? Proper spacing is crucial to making sure they fire correctly and every time. Also, are the correct wires put back in the correct firing order? If all this has been done correctly, take a look at the spark plugs. Do they still look new? Are they covered with oil or early signs of excessive corrosion? Appearences by any of these could point to problems with gaskets. Hope this helps.
Does it come on just when you first start it up after the oil change. Does it stay on for Miles? If it comes on just for a few mint.s right after the change, it has to do with the oil press safety. You install a new filter and as the engine starts it will have to refill the oil filter with oil, plus refill all the oil ports in the block to finely build press to shut off the press safety switch, which will the turn off the light.
all that has nothing to do with this lights being on, you have a malfunction in the electronic engine controls, to find out what it is have the dealer test the system for trouble codes which are stored in the memeory of the cars computer whenever this light(s) comes on.
If the light came on almost immediately after the oil change it is very possible that the oil filter was incorrectly installed and not seated properly. This would be the most common problem if it occured almost immediately after the oil change, and you have never had this problem. It is very easy to do that is why when you are changing oil and putting the new filter back on it is vitally important to make sure that it is on properly. Once the filter is on the filter post you should actually be able to "spin" it fairly easily until it is all the way on. If it does not seem to go easily it is not properly seated.
what you are probably smelling is any oil coming out that may be making contact with hot engine parts. I can't be 100% certain that this is your problem but it is one possibility. The only way to correct this if it is your problem is to re-do the oil change, or at a minimum have the filter re-installed or a new one installed correctly. Make sure the oil afterwards is at the proper level because some is going to leak out when you take the filter off. Good luck
Some filters have an internal pressure valve. If you have the same filter you have always used, it may just have an internal problem (defect). If you changed filter brands, make sure you have chosen the correct crossover number. To check new one, feel the filter and see if it is warming up as the vehicle runs. If it stays cool, it's not functioning!