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Car is a 2003 Hyundai Elantra with ~51,300 miles.

I was driving home when the malfunction indicator light came on.

QUOTE
B260N01A-AAT

Malfunction Indicator Light

This light illuminates when there is a malfunction of an exhaust gas related component, and the system is not functioning properly so that the exhaust gas regulation values are not satisfied. This light will also illuminate when the ignition key is turned to the "ON" position, and will go out in a few seconds. If it illuminates while driving, or does not illuminate when the ignition key is turned to the "ON" position, take your car to your nearest authorized Hyundai dealer and have the system checked.
I tightened the gas cap, and the light was still on.

Does anyone know what's causing this? The car seems to be running fine. Thanks.
 

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Need to scan PCM and see what of the almost 100 different input/output circuit codes could be stored, along with request from TCM to PCM to turn on MIL and point you to the TCM for transmission code(s) if applicable..

Scan and report back proper codes (P-xxxx).
 

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I'll have to go AutoZone or a mechanic then to get the codes. I can probably go Tuesday.

I was reading online and someone said this: QUOTE
The other problem was if you "topped off" the tank. This can cause a small amount of gas overflow which will trigger the check engine light. This situation will clear itself in a few weeks.
I "topped off" the gas tank on Thursday and did not drive the car until today. Could that be the problem?
 

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There is some 100+ codes for all the circuits involved with the PCM, could be anything,,, filling a fuel tank is not a monitored item.. flooding a canister so bad the charchol swelled and exploding canister that it would not hold vacuum during an evap self test, then we got problem, or charchol not allowing CCV to seal during self test... pretty extreme.. lets see what you have and go from there.
 

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QUOTE (JDK721 @ Oct 21 2010, 05:36 PM) index.php?act=findpost&pid=365253
The light went off by itself yesterday. Should I get it checked out still?

Yes.

Code will lay in the memory until erased. Depending on nature of the code/problem area, light will either flash (attention required right now, not later, things will get damaged).. light on, something is up, and light out after being on is not drastic, but still need attention at 1st convienience.
 
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