Elantra MD (2010-15) :: CEL Flashed / Engine Began Misfiring

So yesterday my car flashed a CEL so today I got it checked out early in the morning and the SA told me that my car had the old Engine Software for MY2011 Elantra's so the dealer updated it to the newest one with the TSB and CEL was gone and I was off with a newly washed car.

Then this afternoon my car the dilemma started after I picked up my friends kids. When I started my car, the engine began misfiring to the point it barely starts I even tried revving her a lil bit but to no avail. I had to drive it to the nearest parking lot since I was parked on the street but the engine was not cooperating at all. Good thing she let me move her a few feet away just to be in a safe zone with the kids.

Called my SA and told him about the problem and he told me to call Hyundai Roadside to get my car towed. 30mins later car was at the dealer but tech's are gone for the day so I had to leave my car. The dealership was kind enough to give me a rental until I get back my car. For now I'm driving a 2011 Nissan Sentra (base model) I'll update you guys tomorrow of what happened with my car.

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Elantra MD (2010-15) :: 2012 - Chugging During Acceleration - Misfiring

I am starting to have an issue with my 2012 auto transmission Elantra that just passed 100k miles. When under mild acceleration, as when gently leaving a red light accelerating to 45 mph, I can feel a distinct chugging as if a cylinder is randomly mis-firing once or twice a second. This is never felt during coasting with no power applied. It is also not apparent during full throttle or aggressive acceleration. Only during casual daily-type driving. Now I have had other cars in the past that once in a while would throw a CEL code if a cylinder mis-fired, but I have no Check Engine Light on. This leads me to doubt a mis-firing plug. What could be the cause of this?

Other possibilities would be perhaps the auto transmission is somehow momentarily interrupting power to cause the mis-firing effect??? Is that possible? Perhaps the fuel pump is going bad and getting intermittent? But then why is all good during full throttle?

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Elantra XD (2001-06) :: Check Engine Light And Transmission Fluid Little Low

My check engine light came on in my 2005 Elantra. During the course of trying to find out why I realized that my transmission fluid was a little low. I went to Walmart and got a bottle of the multi vehicle fluid the auto counter man said it needed. I did come online to check to see if that was the right fluid before putting it in and see that evidently the specs are very specific for what type of transmission fluid to use.

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Elantra MD (2010-15) :: Check Engine Light Came On

I'm due to leave at 6am sharp on Friday morning for that pre-planned surprise 50th Bday celebration I've been talking about for my wife. This evening I get in the Elantra to pick her up and when I started the car it began to shake VIOLENTLY, like I was in a commercial dough mixer. WTF!?? I saw the check engine light was on so I shut it off immediately. Curiously, I had the car out earlier without incident.

I restarted the car and it ran smoothly this time, but the check engine light remained. Calling the dealer, I was able to get a 9am appointment for tomorrow morning. I don't have an OBD-II scan tool to check the codes, but based on the symptoms, and recent poor gas mileage.

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Elantra MD (2010-15) :: Check Engine Light On Then Off

So the check engine light on my '12 with 5K miles came on 2 days ago. Called to make an appointment at the dealer for tomorrow...and today it goes off. Is it relatively safe to fore go the appointment and see what happens? I don't think it was related to the gas cap.

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Elantra MD (2010-15) :: Check Engine Light Comes On And Off

I just bought a used 2011 Elantra GLS and am having some issues that the dealer cant resolve. What is happening is the the Check Engine light comes on and off. It will be on for a day or so, then go off for a day or so, so I am thinking its the gas cap. So I tighten that thing up as good as I can and pulled the negative battery terminal and problem solved. About 2 days later, and about 200 miles later on the same tank of gas, the light pops back on. So I call the dealer and took it there the next day.

On my way to the dealer, the light goes out. They try and pull the code, but the ECU is showing nothing. I asked if the ECU stores codes and I was told that when the light goes out on its own it clears the ECU of the code. Not sure if that is true, but that is what I was told. So I drive the car home. I fill the car with gas, drive about 100 miles and the light comes on. I call the dealer the same day, take it over, and on the way like the car knows it goes off and guess what? Dealer cant do nothing.

Now to make a long story longer, this is what I know. The car is not a CA car. It was sold in GA and was a prior rental. It ended up in CA and was sold as a certified pre owned from a Hyundai Dealer, I actually bought the car from a Mitsubishi Dealer and they dealer traded for this car (thats another long story) the carfax does show that it failed emissions but passed after several attempts. Which I thought was odd on a ULEV vehicle. Since I liked the car so much and the price was good, I bought it since it did pass smog eventually.

Once I get the car home, I do my usual thorough look. I clean everything to my standards. I am cleaning the engine compartment and took the engine cover off. 1st thing I noticed was the Spark Plug Coil Packs all the 10mm bolts that hold them in were loose and 2 of them were completely off!! So I decided thats odd, so I pulled the plugs out and they were the NGK's so just in case I put a brand new set of the NGK laser Iridiums back in and tighten everything up. Then I notice where the PCV valve is on the valve cover, the hose that goes to that to the intake tube does not look stock. The hose looks like fuel line hose that someone put on it and the clamps are not stock. So I am canvasing for OEM replacements of those parts now. Then when I was installing the mud guards, on the drivers side rear tire where the gas filler tube is I notice another non OEM clamp. So someone was messing with this area of the car too.

The car is averaging 26-28mpg's in the city and I have been getting 35-37mpg's highway so I don't think there is anything major wrong here. I believe that either the PCV valve hose is kinked and may be causing a fault, or that since it was a prior rental that people were over filling the gas tank and maybe blew the expansion valve in the gas tank, causing the fault. I have no way to prove this since the light goes on and off and clears the ECU every time I take it in.

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Elantra MD (2010-15) :: 2011 - Engine Light Just Came On

2011 Elantra with approx 48500 miles on it. Took a trip to California this weekend. On the way home engine light came on. My reader says code B2AAA but can't find anything on it.

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Elantra MD (2010-15) :: Check Engine Light Comes On When Accelerating

I have a 2015 Hyundai Elantra Limited. Lately, the check Engine light comes on when I accelerate from a full stop and stays on for 3-5 seconds. It has also happened when I accelerate to get on the interstate (that just started today). There is no issue with the car accelerating. Everything else seems to be fine. It's just the Check Engine light that is freaking me out a bit. I've had the car since June so I'm not ready for any major issues. It started two days ago. I took the gas cap off and put it back on last night to see if that was the cause but it's still happening today.

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Elantra XD (2001-06) :: Engine Light While Driving And 2nd Gear Taking Time Shifting - Thump On Transmission

O.K. first of all I had an issue with the Odometer pointer being jumpy. Sometimes it wouldn't move. Now I replaced the input sensor at first and did not fix the problem. I replaced the output sensor and fixed it. "BUT", Now, I have a problem with the transmission shifting. I get an engine light while driving and the 2nd gear seems to take its time shifting and when it does it make the left side drive shaft kick in hard and spends my wheel to a screeching effect. Plus a thump on the transmission. I rechecked the sensor for connection and reinstalled. Drove the car still have the same issue?

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Elantra MD (2010-15) :: Gas Pressure Being Slightly Low - Check Engine Light On

So I got gas 4 days ago and today the check engine light came on afterwards. Went to auto zone to read code and it had to do with the gas pressure being slightly low (gas cap). So I got gas and resealed the gas cap. Well, it's been about 2 days since then and it hasn't gone off. Does it need to be reset or does it take more time?

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Elantra MD (2010-15) :: 2013 - Blinking Check Engine Light

I have a 2013 Elantra GLS with almost 200k on it. I am the original owner. I have only had a few small problems with it just replacing lights and had to replace the passengers side wheel bearing twice. the rest has just m=been replacing wear and tear parts. the check engine light is on because it needs 02 sensors. They are back ordered. The car started idling roughly and driving horribly on the way from Rhode Island to New York on Christmas day. A friend had a diagnostic machine and the code read misfire cylinder 3 p0303..I am assuming it damaged the catalytic converter and that I now need both the sensors and the convertor. I live about 7 miles from my garage. should I tow it ? or drive a t a low speed? Have to bring it in first thing in the morning. What else could be wrong?

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Elantra MD (2010-15) :: Check Engine Light Keeps Coming On After O2 Sensor Replaced

Check engine light came on about 2 weeks ago on my 2013 elantra gls. I went to auto zone to get it checked and they ran a p2096, which is what I had almost a year ago. That was fixed by dealer software update. So, I thought that was what needed to be done, headed to the closest Hyundai and they found p2096 and p2196. They replaced the o2 sensor bank 1, under warranty.

However, the next day the check engine light came on, less than 24 hours. Brought it back to the dealer, they said everything was within the correct "parameters" and said the light shouldn't come back on. On the way to work this morning, the check engine light came on, when the car was in the exact same spot it was yesterday.

I'm thinking the computer doesn't recognize the repair and needs to cycle a few times but I don't know. I'm so tired of going to the dealership because they are obviously missing something if the light is still on.

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Elantra MD (2010-15) :: Ticking Noise Under Very Light Acceleration / Engine Seized At 60,000 Kms

2013 Elantra manual. 60,xxxkm, owned from new, purchased in August 2013. Oil changes always done within 5-7000km. Was 2000km over my oil change due date when this happened (haven't had time to get it done, been driving my motorcycle mostly). Driving around today I dropped my wife off, then I heard a quiet ticking noise under very light acceleration.

The noise would go away under normal acceleration, no noise while revving, and no noise while engine braking. The noise got worse after about 5km. I was in traffic and engaged the clutch into first gear, the car stalled violently. Turning the key results in a click, then nothing. In 1st gear the car will not roll forward. In reverse the car will not roll back. It still rolls in neutral. Had it towed to my local Hyundai dealer and got a rental. Waiting on the results.

Never saw a drop of oil on the ground while parked, and never smelt any oil burning. I run between 87 and 91 octane, whichever is available. I have the extended 160,000km 8yr warranty, hopefully this is covered as I still owe about 15g's on the car.

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Elantra MD (2010-15) :: 2013 - Check Engine Light / Bump When Accelerating Into Gear

So as my first post was about all the upgrades/mods I wanted to get recommendations on, it saddens me that my second is about my check engine light.

I've noticed for the past week a little bit more of a "bump" when accelerating into gear. This Friday, coming home from work the check engine light came on. Checked the oil and gas cap, everything seems ok. I'm taking it into the dealership tomorrow and will update with their findings.

I'm worried cause I would never imagine the light to come on so soon. The car is barely two months old!

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Elantra MD (2010-15) :: Running Rough / Check Engine Light Came On And Misfire Code

In the last month, my car has had an awful time starting on 2 different occasions. The first time it ran really rough for about 1 minute then was ok. The second time was the same but the engine light came on. Took it to an out of town dealer and he said it showed a misfire code but could never find anything else and all looked OK. Spark plugs?

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Elantra MD (2010-15) :: Check Engine Light Steady Not Blinking - Codes P2096 And P2196

I have a 2011 Elantra that I purchased brand new. Has over 60,000 miles on it. Had a check engine light come about year or so ago which was fixed with a software update at the dealer.

Check engine light is back on now. Steady light; it's not blinking. Brought it to my mechanic. Ran diagnostic and said the oxygen sensor needed to be replaced. P codes were P2096 and P2196. He ordered the sensor from the dealership and installed it. Reset my cars computer. I drove the car 26 miles and the engine light came on again.

Here are my questions:

1. Wouldn't my mechanic's diagnostic equipment tell him what the problem or all the problems were? Why would it tell him the oxygen sensor needed to be replaced when there seems to be another problem causing the engine light to come on?

2. Would the dealership have more insight into a check engine light system problem than a mechanic shop may have?

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Kia - Rio :: 2009 - Misfiring And Flashing Check Engine Light

Yesterday out of no where my rio started to misfire so i immediately took it into autozone to have it checked. when doing so the check engine light was on, but solid.

The tests came back with P0300, P0301, and P0302 or 3. I cant find the papers, but its 3 cyns that are misfiring. The guy at autozone suggested i try changing out the plugs first since its cheaper and has been known to fix this issue.

The second I bought the plugs I went home and changed them out. once finished i started up the car and not only was the car still misfiring, but the check engine light is now flashing... I did notice one thing when changing the plugs.

If facing the engine the second coil from the left had a bit of what looked to be rust. i was able to wipe it off with ease. What my next move should be?

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Lexus RX 2004-09 :: Misfiring And Check Engine Light Codes

The car was misfiring and the check engine light codes were all sensor coils were bad. Lexus told me that it was coil6 bad and they fixed it. I should have had no problems, I got a whole 2 miles and I misfired and engine light back on. I drove for a while and light went off and then misfired again. Before I bring it back in I was looking for some insight. I can't understand how it wasn't fixed right the first time but I don't want to go back and get a few thousand bill either. Could fixing one coil cause another to go bad.

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Nissan - Maxima :: 2003 - Check Engine Light On / Misfiring

I recently bought a 2003 nissan maxima 134k and i bought it with the p0300 check engine light on a looked at the engine and though it was an air box problem because they had previously installed a K&n filter so I went to the junk yard and got a 2000 nissan maxima air box and new filter i changed the oil and checked the spark plugs they look new and the dates on the coils are 2012 and 2013 and still its misfiring. i bought it to a mechanic and he discovered a vacuum tank had previously broke and they glued back together so i replace that with a factory one today same problem still misfiring but it got better but now its a p0306 then i erased the code and p0304 came back i erased it then p0302 came back then i change the cam sensors, and the crankshaft sensor and now it get a p0300.

Symptoms:
*when sitting for a long time HARD TO START ( takes multiple cranks to start it ) but once i leave it off for short time like 30 min it starts right up no problem
* when stop at a stop light in drive i can feel small little explosions sounds like my car is beat boxing
*performance is strong good acceleration no problem on that i just don't want it misfiring

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