The 'Check Engine' Light does not turn off?

No one can help until you get someone to pull the codes the computer is reading in order for it to put the check engine light on.

Check the gas cap it is a common cause of the check engine light problem.

STOP using ethenol gas it causes poorer gas milage and resluts in the check engine light coming on. After two tank fulls of PURE gas ( non Ethenol ) the light went off!

Take it to the dealer. My 2011 elantra has been in 4 times for the check engine light. Thy replaced the o2 sensors, but the light still comes on. Hyundai corp is flyin in a tech, because they are apparently having widespread problems, primarily on the east coast. Dealer tried to tell me it was bad gas in the region, but I think that's a load of doodoo. Take it in.. Emissions system is warranted for 8 urs 80,000 miles!

Just have the codes read at autizone or something. The check engine light neans the computer thinks something is wrong. About 50% of codes do not create a driveability issue but is emissions control related.

FYI, I had the same problem (Sonata 2009) and had a dealer check it. They pulled the code, told me it was an evaporative system problem, and asked about refueling and the fuel cap. They reassured me, as I was in the middle of a nearly 3000 mile drive, that it wasn't critical. So, here's the thing. We were at around 6000 feet above sea level, in New Mexico. When we got to the Bay Area in San Francisco a few days later, guess what - the light went out on its own. Which suggests to me that it was to do with altitude and the changes in atmospheric pressure, and actually nothing was wrong at all.

I have a 2005 Sonata and have had issues over the years with the Check Engine light. Every time it was an evaporation leak and I got blamed on the gas cap. Recently it comes on more often and I changed the gas cap which did not solve the problem. The dealer is suggesting the Purge Valve replacement. Any thoughts on the forum?

I have had multiple check engine light problems with 2005 Hyundai Sonata. Car runs fine. replaced gas cap three times. Mechanic cleaned some things. Light still comes on after awhile. Mechanic suggested I ignore the check engine light because it will cost many hundreds to diagnose.

I had a similar problems with my Sonata which became persistent, The problem was my Purge Valve which I purchased on Amazon for $20.53 and replaced it myself. After that I have not had the problem. I also bought the Autel (MaxiScan MS309) OBD-II Code Reader / Scan Tool ($24.99) on Amazon to clear the check engine light. Hope this helps.

Could it possibly be the oil cap itself? I have a 2007 Sonata and the check engine light was on for years. I had a part changed from code readings (at this time, sorry to say I don't remember what it was). That didn't help. After my last oil change surprisingly the light went out. It came on a few times for a short time (maybe three days in a row) and then went out once again. I did have the codes done (when the light was on) and one of the things it could have been was something to do with the oil pressure. I have added oil in the past and just today I needed to. The cap was SO hard to open I had to use a wrench and a screwdriver. When I finally closed it, I used the wrench and screwdriver again, instead of my hand, and to my surprise after a couple of turns, it snapped closed. I tried to keep closing it but at that point it wouldn't budge. I've added oil in the past and never experienced this before and my check engine light was always on. I always just closed the oil cap with my hand, never to the point of it "snapping" closed. Hymmm....maybe this was why the light was always on. Maybe only the last oil change people knew how to close the caps on these cars. Anyone experience this?

There isn't a code for your oil cap, nor would it really cause any codes. Being off would be worse than too tight. If you gave us the specific code that would help. Oil pressure and oil level are 2 different things. If you run to low a level to the point oil pressure is effected you have damaged the engine. Mostly low oil pressure is due to worn oil pump or just a worn out motor. But without knowing the code I can't say much

I have to look for those codes!!

Poo11

Don't know

No issues after replacing my Purge Valve a year ago. Please see my post above.

Never got the chech emgine light to go out. Been taken for over $1000+- by Hyundai deal er . Light always came back on within a few days after pickup from dealer. Ended up dumping the Hyundai shitmobile on Carmax.

Was the Purge Valve ever changed housing?

wow I just got one, the engine light is not on yet.. But I looked at car fax and it had so many vehicle serviced reports in the last 4 months.. So I squeezed it from the Hyundai dealer that the lady keep bringing in the car for engine light on, the said once in the shop the light was off, also did not mention anything about that the could read the codes.. trying to hide something??? So even a dealer reads the codes the can't fix it from reading those codes? I test drove another Sonata at a dealer, there the engine light went off but you could feel the engine is stalling when I push gas. Looks like every 2nd Sonata has that problem :( My 2004 Sonata run like new

I would be not surprised that people that try to safe few cents and put the cheap Arco gas and get the Engine light going on.. I did not have any light at my V6 2004 sontata but when put arco gas the car felt like loosing 20% power !

When my 2005 Sonata V6 was transported from Los Angeles,CA to Spring, TX in March of this year, the engine light came on. I cleared it myself and its been fine passing inspection. Not sure why it happened! The car runs well and we have postponed getting rid of it even though it will turn 12 years in Jan 2017.

I have a 2006 Sonata and the check engine light will not go off. Dealer said there was a hole in the gas tank. My mechanic replaced it and there was never a hole in the first one. The check engine light remained on. The code is 0422. My mechanic did a smoke test and saw smoke coming from around the area where the gas tank connects to the gas filter. He replaced the entire gas filter and cannister and the check engine light is still on $1000 plus later! I will never buy another Hyundai. I have driven Toyota s for years and have never had any problems out of one.

wow as I can see from carfax, the previous owner took it 6 times to the dealer and the could not fix that, then she sold it after 4 months.. to VW I guess the located the problem, the light is off for now.. Unless the just deleted the error codes.. But I had a nightmare with tires, the put some loud tires. So the next set I got the car was wandering, I read also a sonata problem.. Now lucky with american tires :) I was able to return those and take some more advanced tires that fixed that problem..

I have a 15 Hyundai Sonata and I do alot of driving between Utah and Wa st. When I hit 60,000 the car said it needed a service with a countdown on the dash. Then within two days the check engine light came on. I was turning on and off but is now solid. My car get 2mpg worse now and is extremely slow to accelerate now. Normally at idle my car was at 500 rpm now it's its around 1100 or 1200. The code I pulled was a PO1000 I believe. Many thanks

JUST GOT MY CAR HYUNDAI SONATA 2010 100,000 A WEEK AGO AND THE CHECK ENGINE LIGHT CAME ON WHILE I WAS ON MY TO ADMISSION ,GO FIGURE...SO I WENT TO AUTO ZONE TO GET THE CODE THEY SAID THERE WAS 3 BUT THEY WERE ALL THE SAME CODE I NEED A PURGE VALVE REPLACEMENT HOW LONG DOES THAT PROCESS TAKE? GOING NEXT MONDAY

It's a simple change and you can even do it yourself. I've had to change mine a couple of times.

I have a 2009 sonata with the 2.4 liter engine and my check engine light came on last summer so i went to autozone and they checked the codes, telling me it was the evap purge valve. I replaced the valve which took me about 15 minutes and the light came back on so back to autozone I went and the ran the code again and it is now telling me it is the evap vent valve. I don't want to keep changing parts costing me a fortune so i called Hyunai dealership and they said it would cost $98 per hour to figure out the problem, WHAT SHOULD I DO? should i buy the almost $60 vent valve and pray to god that will fix the problem or take it to hyundai and let the "pros" figure it out ?

I got p2096 code for engine light 2007 sonata, does anybody have this code and what cause this?

My sonata 2016 sport and several time engine light on after reset.but engine was weak . I removed catalitic convertor then engine work soft and powerful .

I have a 2007 Hyundai Sonata and just today my Check Engine light came on. I did note that I was low on both oil and coolant so I added a quart of oil and some coolant (need to add more but it's at least to the L right now). Will check the gas cap tomorrow. Any other ideas for what could cause it to just come on out of the blue?

been in the car repair world for centuries. I am working a 2006 Sonata for a P0430 code (bank 2 catalytic converter). I have over a $1200 dollars invested in a customers car and the light always comes on with the P0430 code. Hyundai dealerships and factory reps have no clue. DUMP YOUR HUYNDAI NOW. Money pit!!!!

Cont"d from post above. The evap system on all newer cars are very sensitive. Do not blow air in the system. It is a closed loop system to trap fuel fumes and eventually re-burn them through the induction system. Most common causes are the gas cap, the evap fuel purge solenoid, most can be replaced by a decent mechanic.

Had same issue with 2008. drove fine till it junked the catalyst Changed about everything and it came right back on. Finally replaced cvvt solenoid and it solved the problem. Least expensive part of them all.

I just purchased a 2011 Hyundai sonata on Monday and not even 500 hundred miles down the road the check engine light came on. I also had the car on cruise control and about 30-40 minutes after the check engine light came on the car kicked off the cruise control on its on. I took the car back to the dealership yesterday but Im just wondering what may have been the problem

Talked to the dealership yesterday. He told me they have had s couple cars in with frozen o2 sensors. After mine warmed up in -36c i restarted the car and engine light went out. Today same scenerio at -18 c .

I had a 2002 Sonata that had over 50K miles. Check engine light came on. Went to AutoZone and it read bad catalytic converter. I replaced it myself light went off. Couple of months go by and light comes on again. This time it reads bad O2 sensor. Replaced all four and car ran fine. About a month later I pull out onto the road and engine shuts off and all dash lights come on. Got the car restarted and it wouldn't go above 35 mph. Finally sold it for junk. Now my daughters car which was bought on the same day and is also a 2002 Sonata has the check engine light on. It has almost 60K miles on it. Talked to a former Hyundai mechanic and he said they were set to run rich at the factory and that's why parts are burning out. Anyone else had or have this problem? It seems strange that both cars started out with the same problem.

I've been reading all these posts, most helpful, I just had my 2007 Sonata Ltd -58,500 miles, in for recall (rear crossbar replacement due to rust), when they saw my engine light was on I said ...Been on ,won't go off...the tech just said ..yeah....no other comment. I have my own mechanic looking into this purge valve issue and will post my findings...thx for everyone'should input

Are Sonata's ' lemons' that are not worth spending cash on or taking to dealer ? Daughter has a 2006 SOnata Engine light will NOT go off Replaced 2 sensors already... help ?

Had the same issue on my 2003 Hundai Sonata. Added a bottle of fuel injector cleaner for high milage cars and filled the tank with high-test. Drove the car around for a few hours doing errands and the light turned off. All seems ok now. Btw, the owner's manual says that the light turning on means the car should be serviced soon. If the light is blinking, stop driving and have the car towed if necessary before serious damage occurs.

I have a 2008 Sinata & my check engine light has been on. I had the code read & it said the evaporate system & it was the gas cap. Bought a new cap & the light went out... a week later it went back on. Had it checked again & said the same thing so I bought another gas cap.. Couple weeks later the same thing. I'm tired of buying gas caps so it's on ^ staying that way. I think the lite has to be reset.

not sure why people try to fix the engine light, if your car runs great ignore it.. It sounds me like impossible task.. like removing all the dust from your car.. Its some Hyundai defect or maybe done on purpose to get some more $$ at the dealers

I have a 2012 Sonata and check engine light stays on. Changed gas cap, replaced purge valve, and evap valve but light still on. No solution yet.

Just bought a Sonata GLS 2003 Sedan from a friend of a friend. For $1,000 cash, he had 3 cars and wanted to keep only 2. Anyways, tested the car and it was fantastic. Runs amazing. Left the car 1 entire month after the purchase at my friend's garage without driving it.Then I pick up the car and the first thing after I turn engine on, "check engine" light went on.... What should I do? Go to Autozone ASAP? Get codes? PLEASE HELP. Thanks in advance.

O2 FUEL TRIM IS TOO LEAN- SONATA 2010 My dears, I am afraid this issue, Hyundai- Sonata 2009/2010- P2096, is popular in most cars. It cost me a lot and the engine light still comes on. IT KEELS ME every time!! Anyway, I had to diagnose the code scientifically and based on previous expertise, and the light still comes on! Basically, there are many to what causes this code to appear, LET'S GO! 1. There must be a leak in the air entering the engine or even the catalyst where the O2 two sensors are placed. 2. Like any other fuel issues, Burgs, Valves and Fuel injectors must be replaced/ checked. 3. During the process, the car will show lateness in starting/ running, DON'T PANIC! Replacing the fuel filter at this point is recommended. 4. If things are cool, the car will resume to the start point and the light will annoyingly show up! Now, I am planning to take a step further against this light, which is either to disconnect the check engine fuse and take the risk depending on performance to diagnose rather than to kill yourself with the light on or take out the catalyst converter ( WHICH I DON'T RECOMMEND). A mechanic, however, suggested to clean/replace the O2 two sensors, but I am not sure I am ready for this step because I have read it somewhere that if the light still comes on just to annoy you but no other performance showed up, it's just then a matter of bad quality of fuel in the tank!! All the best.

Had my car in for inspection in October, had oil change etc. I just was at garage today Jan. 28 & needed 1 qt. Of oil already. What may the problem be. I do very little driving being retired