This is a very complicated system with 6 fuses, a turn signal module and a dash integrated control module. No way you can figure this out without a pro grade wiring diagram.
SOURCE: 2000 buick lesabre stall after starting or after running for 30 minutes
I have a 1996 Lesabre. I had a similar problem that slowly got worse. I brought it to two different mechanics that did diagnostic checks and could only "suggest" what to replace to fix the problem. Their problem was that it wouldnt stall out while they had the mv. After replacing a bunch of sensors and the fuel pump/ filter, I solved the problem by replacing the Crank Sensor. Its located behind the lower crank pulley on the 3.8 lt motor. Hope this helps!
SOURCE: Can't find the pcv valve on a 2000 Buick LeSabre.
assume this is a 3800,pcv is on pass side of plastic intake manifold,small plastic locking collar has an arrow on it ,says pcv
SOURCE: PCV location on a 2000 buick lesabre
Open hood, top left side between the valve covers. There is a "funky" plastic housing that turns counter-clockwise (less than 1 inch of travel). then pull straight up to reveal the "missing" pcv valve.
SOURCE: 2001Buick LeSabre parking light
On top of the headlight housing are two large knurled black plastic knobs.Unscrew them counter-clockwise.Now the whole headlight housing may be removed. Set it on the bumper and you'll have easy access to the marker light.
SOURCE: 2000 Buick Lesabre custom liscense plate bulb
kind of tricky, took me an hour to get it figured out, but you got to opend the trunk and take out the 10 or so 10mm nuts sticking out of the backside of the lid, then the whole solid piece where the lights are on the back will slide off, then you can change the bulbs above the license plate and put it all back together
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