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2001 Lexus LS430 Questions

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every time I go down a uneven road the front end makes a bumping noise like something is lose, no one seems to find it.
My Lexus LS 430 2001 has 120,000 miles on it and per the manual I think its time for a spark plug change- what is the best spark plug- Denso or NGK?
The speaker appears to be split and therefore makes a terrible noise when more than a little volume is turned on.
I added water to the battery before discovering in the manual that you are not supposed to add water to the battery. Will this damage it? A light had been left on in the car which drained the battery originally, but charged it up, saw water was low in battery , so added it. What happens if there is too much water in the battery?
i have to replace the alternator charging system 140 amp fuse #62 in engine compartment but dont procedure to remove the old fuse as it is tightly secured in place can you help?
How often must the oil be changed in a 2001 Lexus LS430 if I use a good synthetic oil?
I drive less than 15000 miles yearly, probably 1/2 highway miles. Not much stop and go or stuck in traffic. Can I do 5000 to 7000 miles or do I have to stick to 3000 ?
I had a sign on the dashboard saying I need to replace my A/C filter which I consequently changed, but the notice still shows in my dashboard. How can I reset so that it does not anymore now
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The differential in my '01 LS 430 is now whining and need to replace it. Is there a location on the internet to get part numbers and directions on how to R&R the differential?

Sincerely,
Steve Diepenbrock
how to remove spark plugs
this car is not driven that often, it only has 85000 miles, only 12000 miles within the last three years. this morning,after starting the vehicle and backing it out of the garage,it was put in drive,and given some gas ,but it was very hard pulling foward. I let the car set for approx.1 hour,and drove it with no problem. the car shifted just fine,just like it always has. what caused it to pull hard?
I need to replace the cover for the my rear tail light? Can you give me an estimate?
I do not drive my car hard, but I drove less than 40K miles before pads had to be replaced. This seems to be a rather short distance between brake replacement.
A few months back my right low beam stopped working. Had an aftermarket bulb installed and it continues to function OK. My driver side low beam began to go out recently. At first I noticed that if I turned the lights off and back on, it worked for 1-2 minutes but then went out. Most recently, it has quit working altogether.

Is the solution to replace with a new bulb also? If so, any recomendations on what make to purchase. The replacement I had installed was priced at $142 (a steal when compared to dealer pricing of $424)however, I see that there are several NEW HID bulbs available for much less.
other then the light control computer, and the multiplex computer what else can make your hidlights not work. other then the bulbs my lights stopped working
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