Question about 2004 Hyundai Elantra

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Engine light on 2004 elantra automatic

Light comes on ,stays on, disconnect the battery, touch terminals,light off,restart car light comes on,changed computer with used one,same result,no codes, read that one guy had same problem,changed computer light went off,and radio and clock worked. Is this possible?

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  • Hyundai Master
  • 42,623 Answers

Anything is possible with electronics. If you had the fault codes read first then you would have found out what put the light on in the first place. It is there to let you know that the CVPU has detected a problem that is detrimental to the engine and gear box and just to try to extinguish the light without fixing something is inviting disaster.. Once you have fixed the problem then use the code reader to reset the CPU to put the light out.

Posted on Dec 26, 2013


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SOURCE: Service Engine soon light Code P0133

In most cases this means the O2 sensor is defective.

Posted on Dec 11, 2008

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SOURCE: 2004 Hyundai Elantra problems after replacing alternator

Sound to me like some wires were either disturbed or crossed and are shorting out maybe when you replaced the alternator?Maybe have a look at the alternator connections again and make sure everything is correct and tight and that the new alternator is the right one for your car.Other than that its a case of tracing the wires from the alternator to the fusebox to find whats blowing your fuse.

Posted on Feb 17, 2009

  • 12 Answers


Yes this can be done in place,remove timing belt side engine mounting,lower rear engine mount and front mount and engine can be moved over to leave room to get the plate bolts out that is in front of the timing cover,its awkward but can be done.

Posted on Feb 17, 2009

  • 776 Answers

SOURCE: trans drops into 3rd gear won,t shift to 4th

DTC P0734 is "4th gear incorrect ratio" - that's your torque converter 'LOCK UP Clutch" It's worn out (or you're using the wrong Trans Fluid required by Hyundai - SPIII OR Both). The P1624 is simply the Trans Control Unit (computer) communicating to the Engine Control Module (ECM computer) MIL - on request signal to ECM = asking it to turn on "Check Engine" light. MIL = Malfunction Indicator Lamp. When the torque converter 'lock up" clutch slips or doesn't engage, the trans automatically returns to 3rd gear and stays there (it's called 'fail safe' mode) until you cycle the ignition key, then everything resets until the malfunction occurs again.
You'll need to have an AT (Automatic Transaxel) tester hooked up to verify this. Hyundai has a Service Bulletin specifically for "gear incorrect ratio' codes. If when you changed the trans fluid, was it done at a Hyundai Service Center? If not, someone may have installed the wrong fluid.

Posted on Jun 02, 2009

  • 1 Answer

SOURCE: 2001 Elantra stall, loss of power. Driving at

I am having the exact same problem with my 2001 Hyundai Elantra. I was told that the engine code that comes up when the sensor is on is called "Absolute Pressure In The Manifold". I was told by a "Hyundai Specialist" that when that code comes up it usually means that the seal on the manifold is Fuct. When my mechanic checked that out for me he had noticed that my manifold had 4 cracks in it(can varify cause he showed me). He replaced the manifold and gasket. The car ran fine for about 2-3 days and since then the problem has since come back and my check engine light will no longer go on/off it only stays on. Because of the check engine light always staying on I have noticed that on many occasions my car will hiccup many times in a row. The only way to stop the hiccup I have noticed is to take my foot right of the gas for approx. 2-3 sec then car will continue without hiccup(till it happends all over again). All in all I have been having this problem now for approx. 1 year and if there is somehow someway it could be repaired I would appretiate it.

Posted on Nov 06, 2009

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