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Malfunction Indicator Light


Old 08-31-2004, 02:44 PM
04Dakota is offline
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Join Date: Jan 2004
Location: Whitesburg, KY
Posts: 392
Default Malfunction Indicator Light

Can anyone tell me why this light is staying on? I ask a friend who's a mechanic and he said it could be an oxygen sensor where i didn't close my gas cap tight enough but I always make it click 5 or 6 times.

I am going to call the dealer today and make an appointment to have it looked at but I was wondering if anyone here could shed some light on this for me. Thanks!!

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Old 08-31-2004, 11:23 PM
Spyder is offline
Join Date: Nov 2003
Posts: 182
Default RE: Malfunction Indicator Light

you need a code reader to find out the exact cause of the light.
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Old 09-01-2004, 03:45 AM
tago123 is offline
Join Date: Aug 2004
Posts: 4
Default RE: Malfunction Indicator Light

If you cycle your key in the ignition 3 to 5 times (w/o starting the engine) you can get the code displayed in the odometer on the dash.

I just had P 0423 and P 0455 show up on my '01. I took the codes to the dealer and they said these were standard pressure or vapor leak codes in the tank or fuel filler areas and that if the gas cap gets removed before the engine is off or if the cap is loose, the codes can be triggered and the check engine light will come on.

In my situation, the cap had some rust residue on it. The dealer reset the codes and I replaced the cap with a new one. We'll see if it the codes come up again.

BTW... I was advised that you should NEVER tighten the cap more than 1 or 2 clicks... it doesn't make the cap tighter, it will only wear down the plastic mechanism faster and lead to possible failure.
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Old 09-23-2004, 08:51 PM
Doughrat19 is offline
Join Date: Sep 2004
Posts: 7
Default RE: Malfunction Indicator Light

04Dakota, the same thing happened to my 04. The malfunction indicator light came on the day after I took my truck home! After that it turned on 2 other times, for a day or two at a time. I took it in, turns out my computer was malfunctioning. They reprogrammed it, and I haven't had a problem since. That was back in April.
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