MIL Warning Lite
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=66145
Printed Date: August 13, 2025 at 12:24 PM
Topic: MIL Warning Lite
Posted By: gmcjeep
Subject: MIL Warning Lite
Date Posted: November 12, 2005 at 9:10 PM
My 2001 Jeep Cherokee's MIL light just popped on. There doesn't seem anything wrong. It runs just fine. Can't figure out what to do! Any items where I should start and end? Thanks a $$$.
Replies:
Posted By: 05gt
Date Posted: November 12, 2005 at 9:13 PM
check oxygen sensors, that will be your problem, or maybe catylitic converters, but start with O2 sensors
Posted By: Hornshockey
Date Posted: November 12, 2005 at 9:13 PM
check your gas cap; a loose or fautly cap is the most common cause of a light. Go to your local autozone; they can read the code and at least narrow it down and put you on the right track.
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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.
Posted By: 05gt
Date Posted: November 12, 2005 at 9:15 PM
gas cap will have nothing to do with the MIL light coming on, gas cap might trigger the check engine light check O2's
Posted By: Scott35
Date Posted: November 12, 2005 at 10:01 PM
Overfilling your tank will pop one on too.
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Tacomacrew
Posted By: gmcjeep
Date Posted: November 13, 2005 at 9:06 AM
I just had the car serviced and the light didin't go off. I never fill it up all the way. The gas cap isn't the orginial one I can tell. When you open the gas door and try to put the gap in the slot to sit while your putting gas in, the cap is too small. My other Jeep the cap fit right in there.
Posted By: 05gt
Date Posted: November 13, 2005 at 12:49 PM
please just get your O2 sensors checked that will be your problem, it is someting to do with the exhaust system
Posted By: Scott35
Date Posted: November 13, 2005 at 1:00 PM
If you have an Autozone near you, they may check it for free, at least they do near where I live.
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Tacomacrew
Posted By: jvelez
Date Posted: November 14, 2005 at 9:01 AM
A MIL light will come on for many reasons. If your gas cap is not the correct one, I suspect the computer is sensing a leak in the EVAP system. This is common for not having the proper cap, leaving vehicle running while filling with gas and not tightening the cap. Also malfunctioning EVAP components. The best way to narrow it down is to have someone check it out with an OBDII scanner. It may not have anything to do with the cap, but at least you will know if it's a missfire, O2 sensor, Evap system and so on. Test it before replacing anything. If light starts to flash, have vehicle towed to shop for diagnostics and repair, as this is catalyst damaging signal.
J. Velez
ASE Certified Auto Tech.
Posted By: Mad Scientists
Date Posted: November 14, 2005 at 11:42 AM
MIL = Malfunction Indicator Light = check engine light It's all the same thing now-a-days.. jvelez pretty well described it.. I would add that if you get the codes pulled and post them here we might be able to help you some more. The codes will start with Pxxxx.. the P0xxx codes are federally mandated codes, the P1xxx codes are manufacturer specific. Also, vehicle mileage, engine size etc.. Jim
Posted By: gmcjeep
Date Posted: November 14, 2005 at 7:12 PM
Thanks for all your help! I have a friend that's a master mechanic and he used the scanner, it it is a small hose about 3" in length under the Jeep that a rubber gasket on it is bad. We are replaceing the gas cap also since it is the wrong size. He was also nice enough to program my keyless lock key that I bought on Ebay. You guys are pretty smart. Everyone said it was probably something miner, and it was. Thanks again!
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