Question about 1992 Jeep Cherokee Sport

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I have a maintenance required dummy light that is on. We changed out the O2 sensor and it is still on. What else might it be?

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It is not due to a fault. The light comes on automatically at ceratin mileage intervals. The dealer can reset the light with their scan tool. Not sure if any generic scan tools can reset it. Google it, and you'll see there are lots of people that just take the bulb out...

Posted on Oct 09, 2010

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That is common could be an o2 sensor

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My maintenance required light came on and stays on. since maintenance required is such a broad subject, i was wondering how i can determine what may be causing this problem is it possible that it's the...


normally if its going to be an O2 sensor,, the check engine light would come on, not the maintenance light, I don't know if your car has 2 different ones, My 2000 civic does though,, normally a maint light comes on if its time for an oil change , etc... rest the light,, heres how you do that you use the button that resets your trip odometer to reset the maintenance light.

with the key in the ignition but not turned on, hold the trip reset button in with one hand. then, while holding the button in, turn the ignition key to the ON position so that the lights on the dash come on.

continue to hold the reset button in and watch the maintenance light. it will take about 15 seconds for the light to go out

when the light goes out, turn the ignition key OFF and then release the trip reset button.

your light will be reset and come on in about another 5000 miles to remind you of the next service

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How do I reset O2 service light


if you have already replaced the o2 sensor. disconnect the negative side of the battery ,wait 30

seconds then reconnect the negative, the service light will go away, most cars have two o2 sensors

plus the catalyctic converter. if it comes back you may need to replace another one or your converter.

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O2 senor rear how do u change it)?


O2 sensors normally don't require replacement to stop getting an O2 sensor code even on a 13 year old vehicle. They are an "indicator" to notify you that something is wrong. If the rear O2 sensor is causing a MIL light (idiot or engine light) you should check for an exhaust leak first (most common cause). If there is no exhaust leak before the sensor and the motor is running nearly perfectly with no bogging down in power and no loss of fuel mileage you can expect that the catalytic converter may be starting to fail and you are getting an incorrect exhaust mixture after the CAT. If that isn't the problem just try "swapping" a used O2 sensor from a junk yard before you spend any significant money on the sensor itself.

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When my golf 1.9 tdi been running for awhile if i switch it off them try to restart it it is difficult to restart any idea?


when was the last time you changed your O2 sensors allot of people miss understand these sensors and usually wait until they fail to replace and end up with engine light on.However these are a common switch that is part of a routine tune up maintenance every 50.000kms or so these do affect starting,,cars emissions performance, mileage etc.I have seen these not work properly and not activate engine light so my solution would be O2 sensor Bank 1 sensor 1

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I used to get about 19-22mpg in my 01 Escape V-6. Now I am getting around 12mpg. What is could be causing this. I don't have any lights on my dash? Getting Frustrated!!


What could be causing this:

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4 Wheel Drive causing more drag than usual.
Brake problems.
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Might need Spark Plugs and Wires
Dirty Air Filter
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The possibilities are endless.

I would first start with a full tune up and check the tires for proper PSI. The cheapest and it is regular maintenance.

If that made no change then I would take it to a "good" mechanic to have them run diagnostics on it to see if all your sensors are giving off good values. This can help pinpoint your problem, it can pick up things that will not set off a dash light (dummy light).

If that comes back okay, I would then start looking at the drivetrain. Change fluids, re-grease and look for obvious problems with the brake pads/rotors while tires are off.

Sorry that there is no sure answer to this question, but at least you have a point to start looking from.


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That is a reminder to change your o2 sensors that comes on around 82,000 miles. Check under the dash for a small module about 2" by 1.5" thats semi-transparent and has gears visible inside, pull the plug out of it. If thats not it On the post-Renix and pre-OBD-II XJ's, the "maintenance required" light is driven by the ECU directly. There is NO separate timer like there was on the Renix model. It's designed to come on at 82,500 miles, and basically is an alert to have the O2 sensor changed.

The ONLY way this light can be reset is with the special DRB scanner from Chrysler. The alternative most owners take is to just PULL THE BULB from the warning cluster in the instrument panel.

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Is it a check engine light or Maintenance Required light? If its the maintenance required light, turn the car off, push and hold the trip odometer button while turning the ignition back on. Don't start the car. You'll see five dashes that will count down to none. That'll reset the maintenance required light. Do it after every oil change and it'll come on when its time for an oil change.

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