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Old 03-23-2016, 10:16 PM
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How to turn off Check Engine light?

My check engine light's been on for over an year. I took it to a jeep dealer service station. They ran some diagnostics and found nothing. So I am thinking it's a false alarm. How do I get this light turned off? I doubt jeep dealer guy would wanna do this...

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Old 03-23-2016, 10:44 PM   #2
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Your light doesn't stay on that long for a false alarm. If the light is on, there are Diagnostic Trouble Codes present. Did they tell you the codes?
When you clear the codes via scan tool, the light turns off until that issue is detected again. If you fix the problem, clear the codes, the light will stay off.
If you know about a code and choose to ignore it, get used to a check engine light.
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Old 03-23-2016, 10:57 PM
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actually, the light has been there on and off for perhaps 2 yrs. It used to stay on for weeks, then it would go away, and then come back after a month or 2, stay on for a few weeks and go away. During that time, I had the diagnostics done...they dodnt tell me the codes, and I didnt know enough to ask for them. Anyways, that drama went on for months, may be an yr. Now the light's been continuously on for months...should I take it back for diagnostics? If yes, what exactly should I ask them when they finish running the test?
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Old 03-23-2016, 11:17 PM   #4
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Depending on what year TJ you have, if there is something stored in the computer, you may be able to pull the codes without a scanner.

Try this: Quickly turn your key on/off, on/off,on within a period of 5 seconds and wait. Depending on the year of you TJ, the codes (if there are any) may show up on the odometer.

Try this thread: https://www.wranglerforum.com/f210/tj...codes-358.html or search the internet for "jeep tj check codes" and you will find a bunch of threads.
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Old 03-23-2016, 11:28 PM   #5
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Depending on what year TJ you have, if there is something stored in the computer, you may be able to pull the codes without a scanner.

Try this: Quickly turn your key on/off, on/off,on within a period of 5 seconds and wait. Depending on the year of you TJ, the codes (if there are any) may show up on the odometer.

Try this thread: https://www.wranglerforum.com/f210/tj...codes-358.html or search the internet for "jeep tj check codes" and you will find a bunch of threads.

This. Or go to the auto parts chain of your choice and they can pull the code for you.

Comes and goes could have been normal. It can clear out after so many miles, then pop back on too. If it is on and staying on you should be able to find the stored code.
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Old 03-23-2016, 11:49 PM   #6
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If you paid for the diagnostics, then they should have given you the results print out. Also if you do go to a parts store, there are 3 types of codes from what I have seen and each level of reader is more $$$. Basic OBDII about $40, with ABS $100 with SRS $300.
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Old 03-23-2016, 11:53 PM   #7
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My check engine light's been on for over an year. I took it to a jeep dealer service station. They ran some diagnostics and found nothing. So I am thinking it's a false alarm. How do I get this light turned off? I doubt jeep dealer guy would wanna do this...
If you can't identify the error code, disconnect the negative cable on the battery and wait about ten seconds and then reconnect the cable. Now start your engine and see if the check engine light is still on. If the light is still present you may indeed have a problem. If the light does not reappear, go have a beer and call it good.
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Old 03-24-2016, 12:00 AM   #8
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Spend $40 and get a Bluetooth OBDII reader & get the Torque app on your smart phone. I would consider it a must for anyone that owns a TJ.
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Old 03-24-2016, 08:30 PM   #9
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When you said "My check engine light's been on for over an year..." I thought you meant ON.
Regardless, any parts store will scan it for free then you can do the research. Not sure about your area but most reputable shops around here will also scan for free and write the code(s) down for you.
Or buy your own junk code reader from Autozone to use however often you have a problem. But like Willy said, you paid for that information already when you paid for their "diagnostics".
Plot twist...

They got the oil-change kid to do it.
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Old 03-24-2016, 08:51 PM   #10
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Always check the gas cap when you get a check engine light.
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Old 03-24-2016, 09:03 PM   #11
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Old 04-23-2018, 05:21 PM   #12
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Turn off check engine light

My 2014 Rubicon with many add ons by previous owner (even has 2 batteries) will occasionally have all fault icons light up. engine continues to run. If i turn off engine everything goes dead for a few minutes and then returns to normal except engine check light stays on. Did key on key off key on key off within 5 seconds and check engine light went out. everthing ok till next time.

Took it to jeep dealer while in icons lit condition and they said they would have to remove all aftermarket wiring before they could attempt to determine problem if there is one.
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Old 04-23-2018, 09:52 PM   #13
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My check engine light's been on for over an year. I took it to a jeep dealer service station. They ran some diagnostics and found nothing. So I am thinking it's a false alarm. How do I get this light turned off? I doubt jeep dealer guy would wanna do this...
I had to eventually replace my cluster, my light would not go off either and there were no codes, stored or otherwise. The PO took the bulb out and I failed inspection in NJ because the light would not come on during a cluster test.
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Old 04-24-2018, 12:27 AM   #14
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Old 04-25-2018, 09:36 AM   #15
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You're thinking about this the wrong way. It means "Check this engine out!" It's just your Jeep being proud of how well it runs. Show everyone you know.

Or if it really bugs you, OBDII scanner then replace whatever $200 sensor it is saying has an issue.
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Old 04-25-2018, 09:51 AM   #16
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This is a 2016 thread that somehow became about a JK...but regardless, Harbor Frieght has a pretty good price on OBD Scanners, or get one from Amazon.

https://www.harborfreight.com/zr4-ob...der-63808.html

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