Check Engine Light Due to Gas Cap Issue on Buick LeSabre

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

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Average mileage: 124,713 (42,000–237,611)
9 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004, 2005
66 people reported this problem
36 people shared problem details
Service vehicle soon light on and message said check for loose gas cap. Problem solved by replacing worn and deteriorating fuel pressure harness which is attached to the fuel pressure regulator. Does not require a mechanic to do really. GM part #2450-6640.
12 people like thisFlag inappropiate
gas cap loose warning light comes on. I replaced the gas cap with a new one and it does the same thing from time to time and the gas cap seems to be tight.
9 people like thisFlag inappropiate
that happened to me too but u can kinda fix it by disconnecting and reconnecting the negative battery cable. it resets the computer.
5 people like thisFlag inappropiate
2002 Buick LeSabre53,000
I cleaned the entire area around the gas cap, I had a hand vacume to suck any patricles up
3 people like thisFlag inappropiate
Gas Cap Loose, Check Cap Message AND Check Engine Light.
3 people like thisFlag inappropiate
2002 Buick LeSabre207,861
Check gas cap is on constantly
2 people like thisFlag inappropiate
1998 Buick LeSabre194,500
Problem was intermittent check engine light coming on. Eventually found gas filler tube cracked. Replaced it. Everything OK now.
2 people like thisFlag inappropiate
Check engine light came on...the mechanic plugged the car into his diagnostic computer. According to the code, he said it's probably a problem with the gas cap. He replaced it...that fixed it.
2 people like thisFlag inappropiate
2000 Buick LeSabre130,000
light on, chevrolet dealer put on computer to find & they corrected it.
2 people like thisFlag inappropiate
1997 Buick LeSabre165,000
Display notified me that the gas cap was loose one morning when i started car. I thought it was odd but checked it, it was fine. Still the warning. I bought the car used so i figured maybe the cap was old. So i bought a new one. And the warning went off. 3 weeks later the new cap got really tight and then stopped clicking when turned. on warning. Bought 2nd cap. Warning off. 3 weeks after... warning on again. Not fixed.
gas cap check eng. light is on
2002 Buick LeSabre166,000
Says loose gas cap on dash. Service engine soon light on too. Gas cap is tight and only year old. MAF is new Buick Lesabre 2002 3800 series 2 166,000 miles
2003 Buick LeSabre105,000
For me, this occurred after changing the fuel level sensor. The fuel pump is held in place by a retaining ring that puts pressure on a gasket. I re-seated the gasket and bent the retaining ring tabs down with a brass punch to apply additional pressure.
2001 Buick LeSabre95,000
This was caused by a leak in the fuel filler pipe. New pipe sells for about $500.00, plus installation. This is an easy, inexpensive fix once you know about it. Remove old pipe, easy to remove. Block the large end and fill with water. Blow air in the small end and watch at the large end for bubbles that will appear at the flange. That's where the leak is. Mix up some JB Weld, Walmart $4.00, and apply this weld all around the flange. Make sure you put plenty of weld on and all around or you will get the leak again. After a few hours you can replace the filler pipe. Problem solved.
2001 Buick LeSabre178,000
light is always on. replaced gas cap and light is still on.
Check engine stays on and yes bad gas cap. Where can i get i cap that fits properly so light will go off
1998 Buick LeSabre130,000
No heat from heater. Heater core has been flushed X2, heater blows on the floor but not warm.
2002 Buick LeSabre110,000
THEAD LIGHTS GO OUT WHEN SHIFTING FROM LOW BEAM TO HIGH BEAM SPORADICALLY. hEART STOPPING DANGEROUS CONDITION!!HAD TO CHANGE THE TURN SIGNAL SWITCH, THE SWITCH COSTED $505.49 WITH LABOR $ $ 598.78. SHOULD BE A RECALL BEFORE SOMEONE GETS KILLED. i REPORTED IT TO THE NATIONAL HIGHWAY COMMISSION.
1999 Buick LeSabre130,000
tighten gas cap
1999 Buick LeSabre50,000
Check engine light came on while I was going to work. Have not had a chance to look into it as of yet.
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