Maintenance Required Light?

[Jeepcom23]

1991 MJ 2wd 4.0 HO.

 

What does this mean.

I just hit 120,000 if that matters.

 

Thanks!

-Cody

[freakjeep93]

same as check engine light i think yiou could ignore it

[Jeepcom23]

I read that it comes on at 82,500 to change the o2 Sensor, but I'm at 120,000.

 

And why would I ignore it?

[johnnyc]

Because it's on a timer. I just took the bulb out of the cluster when mine lit up.

 

Maintenance done!

[freakjeep93]

lol i normally just ignore them

[STERLING STINGER]

I'm at 226,000 and had no lights on yet except "part time" for the 4x4

[mfpdm]

Are the maintenance timers in HO era Jeeps? Seems like all the parts lookup for it has 88-90 for the replacement module. :dunno:

 

:cheers:

[johnnyc]

At least they had them in 91 and 92.

[1986Comanche]

Yep, the emissions maintenance light is set off by a timer. Here is a picture of the timer.

 

[Jakeman17]

just unplug it and your all set

[Dave Stark]

The '91 & 92 HO's do not have a mechanical timer, it is actually integrated into the on-board computer. The only way to get it reset is to have a shop do it that has the OBD1 scanner. It serves no purpose in the functionality of the truck (in other words pull the bulb it will save you time & money).

 

Do not confuse the Maintenance required light with the check engine light:

 

Maintenance required light is only the O2 sensor timer.

 

Check engine light means you have a problem that can actually affect the operation of the vehicle.

 

:thumbsup:

[james750]

Where is the timer located in Renix era MJ's

[Jakeman17]

Where is the timer located in Renix era MJ's

it is behind lower kick pannel (lower dash)

[jeepdoggydogB]

In California you will get "fail" on your smog test if one removes the "bulb" for the MAINT REQ light (or any other bulb that flashes at startup), I tried that trick one time. The smog technicians around my parts actually test the bulbs at start up. I purchased the DRB II scanner shortly after to reset the light. I can't help but wonder what RENIX folks do here, since those emission timers cost so much.

[HOrnbrod]

In California you will get "fail" on your smog test if one removes the "bulb" for the MAINT REQ light (or any other bulb that flashes at startup), I tried that trick one time. The smog technicians around my parts actually test the bulbs at start up. I purchased the DRB II scanner shortly after to reset the light. I can't help but wonder what RENIX folks do here, since those emission timers cost so much.

 

Just one of the many paybacks you Cali guys have to suck up and shell out for the privilege of living in "Paradise" Joe. :D Although I can see the need for the DRB2 since you have an HO if you got it cheaply. There are times I'd like to have one too. I pulled the MAINT REQ lamp many moons ago...............

[Jeepcom23]

Thanks a lot guys. I just wanted to make sure nothing was wrong. :cheers:

[jeepdoggydogB]

In California you will get "fail" on your smog test if one removes the "bulb" for the MAINT REQ light (or any other bulb that flashes at startup), I tried that trick one time. The smog technicians around my parts actually test the bulbs at start up. I purchased the DRB II scanner shortly after to reset the light. I can't help but wonder what RENIX folks do here, since those emission timers cost so much.

 

Just one of the many paybacks you Cali guys have to suck up and shell out for the privilege of living in "Paradise" Joe. :D Although I can see the need for the DRB2 since you have an HO if you got it cheaply. There are times I'd like to have one too. I pulled the MAINT REQ lamp many moons ago...............

The price I gotta pay for good eaten' I guess. :cheers:

[HOrnbrod]

I know what you be talkin' about. We had a whole lechon for Thanksgiving. :thumbsup:

[jeepdoggydogB]

I know what you be talkin' about. We had a whole lechon for Thanksgiving. :thumbsup:

Yes! We had one too! :cheers:

[88SporTruck]

The PO of my Comanche had tried in vain to color over the light with black sharpie to make it go away! I removed the bulb and used it to replace my burned out "BRAKE" lamp (which now stays on constantly due to a bad ebrake switch) and I removed the module and mounting bracket and threw them away. Problem solved permanently.

[Pete M]

The PO of my Comanche had tried in vain to color over the light with black sharpie to make it go away! I removed the bulb and used it to replace my burned out "BRAKE" lamp (which now stays on constantly due to a bad ebrake switch) and I removed the module and mounting bracket and threw them away. Problem solved permanently.

 

 

The ebrake sets off the light? Guess I'd never would have known that (seeing as I don't have a functional ebrake in the fleet).

[Jakeman17]

me either

I think i wanna get mine working though

[Jeepcom23]

me either

I think i wanna get mine working though

 

You guys really should, It saves a lot of stress on the tranny, and driveline.

[HOrnbrod]

You guys really should, It saves a lot of stress on the tranny, and driveline.

 

Wha? How?

[Pete M]

I think he's referring to using the ebrake instead of putting an auto trans in park, which reduces stress on the parking spur.