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Discussion Starter #1
i had a CEL come on awhile ago. finally got it checked, and they cleared the codes and told me it was the 2nd O2 sensor. drove it around for about a week while the sensor shipped, and the CEL came back on by the end of the week. Last friday i replaced the O2 sensor finally.... and its now almost a week and the CEL is still on.

what im askin in, should it turn itself off? or does it have to be reset (and how would I do that...don't want to have to pay someone!) i do kno that if u disconnect the battery for awhile it resets. But i wanted to see if it turned off on its own, cus now this makes me wonder if its <i>not</i> the O2 sensor, or we messed it up putting it in, or somethin. Or does the code actaully have to be cleared out even tho the sensor is workin fine? ...it was the right part, so i kno thats not it.

thanks

Accent GSi (98, black)
Naxos muffler
Clear side markers
Custom front grills

Custom CAI soon...
 

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Blackdevil,
The Check Engine Light on Hyundais are ultra sensitive. They say that the light has to be reset when it goes on by the dealer. However, my light has gone out on its own on several occasions. Basically, the most common things that cause the light to go on are
1)not tightening the gas cap
2)O2 sensor
3)K&N airfilter (onboard computer monitors airflow)
4)Letting the car sit for days at a time without being started.

Now, if the light were to go out on its own, its usually within a few days of its appearance. 3-4 days at the most of normal driving. Basically the most common cause for it to go on in the first place would be misfiring...this happpens in a fraction of a second, so you wouldn't notice. Now, if the light goes out, it stores the code. So if it happens again and goes out, you can still bring it in and they can see whats going on...If it doesn't go out within a couple of days, then it could be a serious problem and I recommend bringing it in.

2000 Black Hyundai Elantra GLS
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Hey, you said K&N filters can turn on that light. Well I got K&N and the light hasnt turn, and my car never turn that light on no matter what. I guess that my light aint that sensitive or maybe it doesnt work at all...
 

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I put the filter in on mine and it took 6,000 miles until it started turning on and off. Im pretty sure it was that because as soon as I took it out, the light went out and hasn't been back on since. Piece of crap. KN filter suck. Its all a "physcological" thing. It don't give you any more horsepower. Its all in your mind. I know cause I use to have one <img src=icon_smile_big.gif border=0 align=middle>

2000 Black Hyundai Elantra GLS
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jrh382

dude, you car can sit for MONTHS, and a CEL will not get triggered just because it sat there.

K&N filters flow significantly more air than stock paper filters, more air increases volumetric efficency, which icreases HP.

If you doubt me, I will lay a challenge on ya. Bring your car with the 100% complete stock intake, and I'll bring a K&N filter. We will throw them on the dyno. If the K&N filter shows more HP and torque, you pay for the dyno's...and the filter. If it doesn't, then I'll pay for the dyno's.

Leave it to Random to Needlessly complicate things.
 

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Dude, this is from MY personal experience. Over the summer, I took the train to work during the week. So the car would sit for a couple days at a time w/o being driven. When I would start it up, the light would come on about 10 minutes into the drive. First time this happened, I called the dealer. Later on that day, the light went out. Following week, same thing happened. THen one more time a month later. Everytime I called the dealer, the light would go out and they couldn't find anything. The car acted the same, drove the same. Just the light was on. I thought it was from letting it sit there because I drove it a lot before the summer. I told the mechanice what I thought and he agreed that could be it. Some cars can handle it. My mothers Saab sits in the garage for days at a time and nothing happens. Once again, MY PERSONAL EXPERIENCE. I am not a mechanic, but I do know how to maintain a car and fix things as I learned from my father who use to be an automechanic.

You seem to know your **** as well, so I am not challanging you. However, I want to tell you why I think the K&N air filter is a piece of ****. First off, I have 2 experiences from it. 1 year ago, I tried it out on my Jeep Cherokee. I put it in after I did a lube job on the car. I was driving it down to work and all of a sudden, the car started to stutter like crazy and stalled. Started back up, engine light came on. I drove it home, started to stutter again as I got in my driveway. Wondering if the K&N was the cause, I put the stock filter back in and the car was FINE. Trying once again after hearing how "awesome" this thing is, I decided to try it out in my 2000 Elantra. Everything seemed to be fine. But I found no change in the performance of the car, throttle. Then, it started the engine light crap. So basically, with the car not being driven as much, as well as the K&N filter was screwing up the onboard computer. That is why I think its a load of crap and more of a physcological thing rather then real hp. Im well aware that K&Ns allow more airflow into the engine, but I STILL don't think it makes a substantial difference in the performance of the car. Why? As I described above, I tried it out in 2 cars: 1 automatic and 1 5spd, 1 american and one domestic...and it caused nothing but problems. If it helped you out. Great, Im glad it worked out for you. All I am doing here is troubleshooting to see what the CEL could be doing from my own personal experiences.

2000 Black Hyundai Elantra GLS
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Discussion Starter #7
hmm, well i really don't know. But im pretty sure they DO do something. and ur beef, then, is not with K&N specificly. more like all cone filters in general. Anyway, id think that with the filter in place of the stock air box, ud get MORE air. But it is hot air anyway, so why bother? I'll tell u tho, a CAI <b>deffinitly</b> makes a difference! U can really feel it, and i could chirp my tires at about 10-20 mph in second! no way i can do that stock.

btw, the stuttering/stalling of the jeep? maybe the intake slipped off..or somehow something wasn't connected right. Im not familiat with jeeps beyond my friends 5.9, and im sure urs wasn't a 5.9 so i dunno. anyway, my accent did that when my maf came loose and air was no longer sucking thru it.

not starting a flame or dissin ya, but being that its a personal experience, theres always a chance that u personally coulda done something differnt than someone else...causeing the results u experienced. Im sjut sayin this, cus i kno there are alotta people who love their intakes <img src=icon_smile_big.gif border=0 align=middle>

Accent GSi (98, black)
Naxos muffler
Clear side markers
Custom front grills

Custom CAI soon...
 

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Well, the only modifications I have done were comsmetic. This is all based on a non-modified engine. Random knows his ****. I am not in anyway denying that. Different things happen to different cars. You think about this: Cars have hundreds of moving parts. If you let it sit for a long period of time...things can happen because the parts aren't moving. Thats what I learned from owning cars. This car has some unusual quirks. I mean, what other car (besides Volvo, I believe) has the engine light come on if the gas cap isn't at least 3 clicks tight?

2000 Black Hyundai Elantra GLS
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Discussion Starter #9
<b><i>3 CLICKS?!</i></b> sweet mother of pearl... i NEVER tighten it till it clicks! i always figured the clicking was cus..its tight and ur over-tightening it, so it has some sort of rachet mechanizm so u don't break it or stripe the threads or just plain get it so u can't remove it. DAMN i will have to go tighten it and see how it does.

Accent GSi (98, black)
Naxos muffler
Clear side markers
Custom front grills

Custom CAI soon...
 

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jrh382

When the CEL is triggered, the ECU records the error codes. The dealership should have been able to tell you what that error code was.

The fact that the error code returned when you used the K&N filter leads me to believe that something else is wrong with your car, and the returning CEL is trying to tell you something.

By installing a K&N or generic cone filter, you are not doing anything to the engine other than simply giving it more air. This should not trigger a CEL or problems in a car that is performing 100%. However, if the car is having ignition problems, fuel delivery problems, or other problems, the added performance of the K&N filter might make/have those problems occur more frequently or with more severity. This does not mean the K&N/Cone filter CAUSED the problem, rather it simply made the exisiting problem show up/worse/bad enough to trigger a CEL.

If you have the time, I would install the K&N filter again, wait for the CEL to come back on, and then take it to a NEW dealer to have the CEL Looked into. My guess is that it has something to do with the Ignition system is having problem igniting the larger/bigger air/fuel mixture that a K&N delivers. The Beta motors are known for crappy stock plugs, crappy stock wires and problems with the coilpacks...they are usually the cause of most CEL's on mostly stock/100% stock engines.

Leave it to Random to Needlessly complicate things.
 

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Discussion Starter #11
u can get ur ECM scanned almsot anywhere. I got mine done at a schell station, for cheaper than the dealer too =) they wanted 180 dollars for a new sensor and 20 for labor tho...so u might wanna just SEE whats wrong, then price that procedure too.

Accent GSi (98, black)
Naxos muffler
Clear side markers
Custom front grills

Custom CAI soon...
 

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Random, I had the plugs changed. The very first time the engine light came on was last year. The engine would crank, but not start. Came back out an hour later. Finally started. What happened was the Champion spark plugs that were in there before misfired leaving a carbon trail...causing this problem. I replaced those with NGKs. Hyundais don't react well to Champions. The second time, 02 sensor went. Then after that, all the on/off CEL **** started. And the dealer couldn't find anything. The car ran fine and they test drove it and yet nothing <img src=icon_smile_question.gif border=0 align=middle> But you are probably right about the ignition system haveing a problem igniting the larger air intake/fuel coming into the engine. That would trigger it, such I believe it did in mine with a combination of that and not being driven as much.

2000 Black Hyundai Elantra GLS
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Im going to have to agree with Random on this. The computer might not know how to increase the other necessary componets to reap the benifits of the K&N. If theres more air coming in is more of a percentage than the computer can supply fuel for then yah its going to have problems. As with performance chips they are more programed for different things and can adjust acordingly
 

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I also believe he is talking about a drop in k&n and not a cone filter. You might not see hardly any increase with a drop in opposed to a cone / cai setup. I had an isuzu p/u with a drop in and it seemed the same way, but my cai in my tib really is noticeable.

2001 blue Tibby, leather, cd, custom racing stripes, etc. every option avail.
 

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I heard the best way to turn of a CEL is to just disconnect the battery for awhile or something. I don't remember the exact way to do it...but it had something to do with the battery. <img src=icon_smile_blush.gif border=0 align=middle>


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There may be more hp with the K&N, but I just don't feel it when I had it in both my cars I have. Im sure if you put it on the dyno, you would see a difference in hp output. Just not enough for me to feel it when I had it in my cars.

2000 Black Hyundai Elantra GLS
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you can leave the battery unhooked for like 10 minutes and it will reset the ecu...
 

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I have also been told to take the battery cables and touch them to each other to dischrge the light. I do not know if realy have to do this or not but I figure what the hell. they are in my hands anyway<img src=icon_smile_big.gif border=0 align=middle>

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I have also been told to take the battery cables and touch them to each other to dischrge the light. I do not know if realy have to do this or not but I figure what the hell. they are in my hands anyway<img src=icon_smile_big.gif border=0 align=middle>

Hmm.. I would be very carefull in creating a short circuit on purpose. It might work for you, but if somebody with 1 farad cap for his stereo in the trunk might not be so fortunate...
 
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