Question about 2000 Buick LeSabre

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2000 Buick Lesabre has security light, check engine & gas cap loose light on?

I had a dx test done & it only read that the gas cap loose....replaced gas cap w/cap purchased @ Auto zone lights never went off, someone said that I had to get one from the manufacturer or it will not work. I'm afraid to take my car to a mechanic because you can't trust them.

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I'm sorry you feel that way about mechanics but there are those that you can trust. I'm a diesel mechanic and have been in business in Australia for 20 years and I am disappointed to hear this sort of statement.However it is possible that what you heard is true??The high-performance engines today rely on the fact that they are a closed system. That means that any leaks in the system be they air or water or gas.
I know that many engines will stop if you remove or loosen the filler cap for the oil. Likewise if they lose pressure in the fuel tank they will have performance problems.
I would enquire around your neighbourhood for the name of a really good trustworthy mechanic and you will find or should find a good and trustworthy mechanic and ask his opinion.
With regards

Posted on Feb 20, 2012

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Posted on Jan 02, 2017

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SOURCE: my 1995 buick lesabre check engine light is on

Take it to a real mechanic, not the phoney physics at the zone. The speed sensor will not respond if the car is not moving. May be an air flow sensor. They will go bad if it has ever been wet. They can be checked with a scan tool.

Posted on Aug 03, 2009

dmsr63
  • 2050 Answers

SOURCE: How do you nturn off loose gas cap alert?

You need a scanner to do that, but...after so many starts of the engine, if the problem is solved, the light will go away. (I seem to think it's 50 starts)

Posted on Oct 13, 2009

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Posted on Oct 19, 2009

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SOURCE: 2001 buick lesabre gas cap loose warning light

GM vehicles are fmaous for this warning. I had the same problem in my GM vehicle and had to replace the EVAP vent solenoid. Are you getting a DTC yet or just the tighten gas cap message? INspect the fuel cap to make sure it is not damaged and is installed properly. If it's damaged replace it. If all is good on the cap just wait for the DTC to show up but most likely you'll need to replace that solenoid.

Posted on Dec 22, 2009

Testimonial: "very helpful"

SOURCE: I get the message that

So what exactly is the problem?

Posted on Jul 01, 2011

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A factory fuel cap would be a good start. The other possibility is that the vent solenoid is stuck open. Ou can buy an inexpensive code reader for about $50 that will both read and clear codes. If the new dealer gas cap took car of the problem than the light will stay off after you clear it. If it was to the problem than the light will come back on. The EVAP system can be checked with a smoker. Any good shop that deals with these problems will have one. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

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Code PO442 means you have a small leak in your evap system. Codes PO452 & PO453 refer specifically to the fuel thank.

Although it will be a good idea to change your gas cap, I don't think it is where your problem is coming from.

I would check the vacumm hoses for loose fitting or small cracks.

Specially if you had your car worked on recently.

Good luck

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1 Answer

How do you nturn off loose gas cap alert?


You need a scanner to do that, but...after so many starts of the engine, if the problem is solved, the light will go away. (I seem to think it's 50 starts)

Oct 13, 2009 | 2000 Buick LeSabre

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