Does a mechanic need to reset the "Check Engine" light on a 2004 Buick LeSabre first, to see if replacement of a GAS CAP fixes a "Loose Gas Cap" error message?

Asked by Feb 23, 2016 at 11:28 AM about the 2004 Buick LeSabre

Question type: Maintenance & Repair

I had a "Loose Gas Cap" message on my 2004 Buick LeSabre that caused
the "CHECK ENGINE" light to come on.  I replaced the gas cap and have
driven the car for over a 100 miles in all types of traffic.  I was told by
AUTOZONE that this is necessary for the emissions control system to see
that there is no longer a vapor leak, and if the problem has gone away, it
should extinguish the "CHECK ENGINE: light.

The light has not gone out yet.

Is it possible that a mechanic needs to RESET the Check Engine light
FIRST?   For all I know  I will then need to drive another 100 miles and see
if the light comes back on, to see if the new gas cap fixed the problem?  If I
do this, how many miles would the car need to be driven to be certain the
problem is fixed?  Incidentally AUTOZONE said they are not allowed to
reset Engine Lights; only mechanics can do that.

4 Answers

122,755

Yes all the above is correct. It should have reset itself by now. Might be something else in the system causing the gas cap light to come on. What it's sincing is some sort of vapor leak in gas tank system. Could be bad cap or vac hose/canister issue. Smoke test done by a mechanic is about the only way I know of to check for other gas system emission leaks.

1 people found this helpful.
645

Mine has same error code for 100,000 miles roughly. Gas cap/ pump/ vacuum lines/ etc have been replaced. Unhook the battery for 15 min. Both terminals and then the light should be off.. Unless the problem isn't fixed

DANGER DANGER Unhooking the battery can trigger the THEFTLOCK on stock radio. You have to have BUICK fix it for big bucks. The radio came with a CODE STICKER on it that has to be punched back in to unlock. No problem with aftermarket radios. Most times its the gas cap or o'ring on gas cap. Take so many start/stops to manually reset or just have Advance or Autozone reset.

645

Once the radio is programmed to a specific vin # it won't ever need programmed again. I have had my battery out many time and never had any trouble but I have went through all the codes for vapor lock and many more. Had mine 12 years plus and has 269,000 miles on the odometer.

Your Answer:

LeSabre

Looking for a Used LeSabre in your area?

CarGurus has 1,259 nationwide LeSabre listings starting at $1,750.

ZIP:

Buick LeSabre Experts

  • #1
    Tom Demyan
    Reputation
    2,480
  • #2
    John Saffrahn
    Reputation
    2,210
  • #3
    Austin Gaboda
    Reputation
    1,510
View All

Related Models For Sale

Used Buick Park Avenue
288 listings starting at $2,600
Used Buick LaCrosse
210 Great Deals out of 11,680 listings starting at $1,000
Used Chevrolet Impala
384 Great Deals out of 25,757 listings starting at $950
Used Buick Regal
91 Great Deals out of 3,929 listings starting at $5,300
Used Buick Century
535 listings starting at $3,995
Used Honda Accord
566 Great Deals out of 103,985 listings starting at $950
Used Cadillac DeVille
1,263 listings starting at $2,000
Used Chevrolet Malibu
489 Great Deals out of 51,744 listings starting at $1,995
Used Toyota Camry
759 Great Deals out of 73,415 listings starting at $1,195
Used Lincoln Town Car
28 Great Deals out of 1,469 listings starting at $1,900
Used Ford Taurus
184 Great Deals out of 15,879 listings starting at $600

Used Cars For Sale

2005 Buick LeSabre For Sale
219 listings starting at $1,750

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.