Question about 1991 Buick LeSabre

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My '91 buick lesabre's check engine soon light stays on but it is running fine and all the fluids are fine. How can I reset it?

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Posted on Jan 02, 2017

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SOURCE: 1997 buick lesabre, engine light stays on

The are many things that can cause your "check engine" light to stay on. One possibility is that although you have fixed the trouble code for your crankshaft position sensor, the code has not been erased from the computer's memory. Another possibility is that you have another issue going on that is causing a new trouble code to come up. You're going to need to have your car hooked up to a ODB-2 engine code reader to see what the issue is. These code readers are available for purchase at any auto parts store. In addition, many of your local auto parts stores will check trouble codes as a free service to customer. If not, many parts retailers offer the option to rent one of these code readers. Which ever way you decide to go, run a full engine/emissions trouble code check. If the only code that comes up is the code that came up previous to fixing your positioning sensor, then all you need to do is erase the trouble code from the computer's memory. (Most code readers have the option to erase trouble codes, but if you're going to rent or buy one, I would suggest that you check to make sure that the code reader that you're getting is capable of erasing trouble codes as some code readers only indicate the codes and will not remove them from your computer's memory.) If your trouble code scan reveals other codes, then you'll have to fix and erase them as they arise.

FYI- In my experience, I've noticed that 95% of the time that a check engine light/trouble code arises that it is usually an emissions problem (oxygen sensors, mass air-flow units, MAP sensors, etc.). However, General Motors products are notorious for getting trouble codes for having loose battery/ground connections and for having worn-out fuel caps. With any GM vehicle, I always check these two things first to try to save me from having to look further than I need to.

Hope this helps! I'm sure once you've scanned your cars computer and erased any existing trouble codes, that you'll stop being annoyed by your check engine light, as I know how bothersome it can be. Have a great day!

Posted on Nov 23, 2008

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SOURCE: 91 buick lesabre

Assuming proper battery voltage; Open fusible link in engine compartment, defective ignition relay, or defective relay panel...accordianman

Posted on Dec 15, 2008

emissionwiz
  • 76132 Answers

SOURCE: service engine light is on in my 2004 Buick LaSabre

the service engine soon light means a fault has occurred in the engine or emission system's electronic controls, it has nothing to do with any service you did in most cases, there are over 150 problems that turn the light on, to find out what the problem may be go to any Kragen Auto or Autozone parts store and ask them to run a OBD 2 trouble code test, IT IS FREE. then post the code back here for us to look at, which is also FREE.

Posted on Apr 09, 2009

  • 55 Answers

SOURCE: check engine soon light comes on once in a while

Take it to Auto Zone and they can run a scan on it to see what it could be? If you want to know for sure, your best bet is to take it to a dealer and have them hook up a Tech1 scanner. If it is flashing all the time get it in soon. Usually it is an o2 sensor or some other computer controlled sensor. But it is tough to say for sure.

Posted on May 02, 2009

  • 3 Answers

SOURCE: How do I reset my Check Engine Light?

you could go to an auto parts store and they can reset it for you, or you could pull your battery cables off the battery and hold them together for about 10 sec. that will clear any codes.

Posted on May 29, 2009

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Does this have a "Check Engine" or "Service Engine Soon" light on? If so, get the codes pulled and post them back here along with the engine info. If no codes are present then it may well be a bad crankshaft sensor. I have seen many of these give intermittent problems (usually heat related) and do exactly what you have described without setting a code.

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1994 Buick Lesabre service engine soon light. Can't read code.


I found several shops in my area, Albany, NY that had the older code readers. It worked fine, and cost me $30.00. It showed a bad O2 sensor that I replaced myself. I suggest you go to a reliable shop. Auto Zone/Advance etc.. do not have the right code readers. Joe

Feb 01, 2009 | 1994 Buick LeSabre

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