boosst Posted April 23, 2011 Share Posted April 23, 2011 I haven't had my MJ for very long but the "maintenance required" light has been on since I got it. It runs great but just wondering how I would go about finding the reason it is on or turning it off...? Link to comment Share on other sites More sharing options...
whowey Posted April 23, 2011 Share Posted April 23, 2011 It is set by a smoke colored timer under your dash. Remove the timer, the light goes out and stays out. It will be to right side under the lower dash. look to the right of the steering column. You can see the plastic gears inside that make the timer work. Unplug it, grab a cold drink, call it a day. Link to comment Share on other sites More sharing options...
64 Cheyenne Posted April 23, 2011 Share Posted April 23, 2011 :agree: FWIW I don't believe these are available any more, but why would a person want to replace it anyway? Link to comment Share on other sites More sharing options...
jeepdoggydogB Posted April 23, 2011 Share Posted April 23, 2011 By your sig I see you have the 1991 which means the light is controlled by your ECU. If you are lucky enough to have access to a DRB II scanning tool you can turn it off. Many that do not have access to the DRB just remove the bulb unless of course you have your vehicle inspected for smog or safety as the techs will test the warning lights at start up. Ay least thats what they do out here in the San Francisco Bay Area. :fs1: Link to comment Share on other sites More sharing options...
boosst Posted April 23, 2011 Author Share Posted April 23, 2011 I don't have access to the scanning tool and am not checked for emissions. Do I remove the bulb from behind? Link to comment Share on other sites More sharing options...
jeepdoggydogB Posted April 23, 2011 Share Posted April 23, 2011 I don't have access to the scanning tool and am not checked for emissions. Do I remove the bulb from behind? Just remove the dash bezel and there are four screws that hold in the light covers and instrument panel, remove them and you have access from the rear. Link to comment Share on other sites More sharing options...
jpdriver1 Posted April 23, 2011 Share Posted April 23, 2011 By your sig I see you have the 1991 which means the light is controlled by your ECU. If you are lucky enough to have access to a DRB II scanning tool you can turn it off. Many that do not have access to the DRB just remove the bulb unless of course you have your vehicle inspected for smog or safety as the techs will test the warning lights at start up. Ay least thats what they do out here in the San Francisco Bay Area. :fs1: had mine smogged about 6 wks ago -- tech at the jeep dealer in fort bragg spent 25 mins trying to figure out why the light did not come on (or course it was missing) -- he finally went to the service mgr for advise -- he could not figure it out either -- they finally gave up and because all else was good -- they passed it . Link to comment Share on other sites More sharing options...
mvusse Posted April 23, 2011 Share Posted April 23, 2011 I don't have access to the scanning tool and am not checked for emissions. Do I remove the bulb from behind? Just remove the dash bezel and there are four screws that hold in the light covers and instrument panel, remove them and you have access from the rear. Six scews. The light is turned on by a timer, and basically means it's time to replace the oxygen sensor. Link to comment Share on other sites More sharing options...
jeepdoggydogB Posted April 23, 2011 Share Posted April 23, 2011 By your sig I see you have the 1991 which means the light is controlled by your ECU. If you are lucky enough to have access to a DRB II scanning tool you can turn it off. Many that do not have access to the DRB just remove the bulb unless of course you have your vehicle inspected for smog or safety as the techs will test the warning lights at start up. Ay least thats what they do out here in the San Francisco Bay Area. :fs1: had mine smogged about 6 wks ago -- tech at the jeep dealer in fort bragg spent 25 mins trying to figure out why the light did not come on (or course it was missing) -- he finally went to the service mgr for advise -- he could not figure it out either -- they finally gave up and because all else was good -- they passed it . That is how I wish my story ended, but alas the smog techs out here weren't as forgiving. When they failed me, I lucked out and found a DRB II scanner on ebay, turned off the light and I was passed after a second fee :fs1: . I think some folks here are confused between the HO Maintenance required lights and the Renix module that is no longer available. Link to comment Share on other sites More sharing options...
HOrnbrod Posted April 23, 2011 Share Posted April 23, 2011 I think some folks here are confused between the HO Maintenance required lights and the Renix module that is no longer available. They are. 91-92 HOs have no timer module, the timing is done internally in the ECU. To turn the MR lamp off you can go to the stealer and he'll charge you one man hour's time to stick the DRB-II on and turn it off, find your own DRB like Joe did, or remove the bulb like I did. :cheers: Link to comment Share on other sites More sharing options...
johnnyc Posted April 24, 2011 Share Posted April 24, 2011 I guess SoCal is more forgiving than NorCal. I took that bulb out when I got the truck in '08. I've had it smogged three times and no one ever said anything about the light not going on. Link to comment Share on other sites More sharing options...
jeepdoggydogB Posted April 24, 2011 Share Posted April 24, 2011 I guess SoCal is more forgiving than NorCal. I took that bulb out when I got the truck in '08. I've had it smogged three times and no one ever said anything about the light not going on. Thanks Johnny now I am really bummed :cry: Am I the only guy in California that has to deal with smog Natzi's? I would love to find a different shop around here to smog my truck, I tried three with the same results. If I find a SF Bay Area shop that doesn't look at the lights at startup I will certainly take note for others. Link to comment Share on other sites More sharing options...
jpdriver1 Posted April 24, 2011 Share Posted April 24, 2011 in mendocino county -- we only smog once or until the vehicle is sold Link to comment Share on other sites More sharing options...
Eagle Posted April 24, 2011 Share Posted April 24, 2011 The light is turned on by a timer, and basically means it's time to replace the catalytic converter. Oxygen sensor, not catalytic converter. Link to comment Share on other sites More sharing options...
mvusse Posted April 25, 2011 Share Posted April 25, 2011 Sorry, my bad. Fixed in my original post. Link to comment Share on other sites More sharing options...
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