Check your oil. If it is milky/tannish, then all signs point to the possibility of a cracked engine block. I hope not. That would mean a new or rebuilt engine and probably a few thousand$$$. Hope it's something else, friend.
SOURCE: lexus gs300
inside the gas tank. remove the gas tank and its right on top. remove all 3 screws and turn and pull out.
SOURCE: Rattling Coming from Engine At low RPM (stopped) and when accl.
If this sounds like a tin can rattle it is likely a loose heat shield on top of the catalytic converter. They come loose after time and corrosion take their toll.
SOURCE: 92 lexus es300 knock sensor
Need to remove the upper and lower air intake manifold. There are two knock sensors for the front and rear pistons banks. If you plan to do this yourself it is about 1 to 2 hours. While you are at it, there is a short coolant bypass hose sitting in the same spot, replace it. Another problem with the knock sensor is the wire harness used to connect the two knock sensors into one connection sometimes wears out and contacts the metal on the engine causing false signals to the ECM, so replace this cable also.
Just did this last summer on my 99 ES300. Pretty easy.
DIYr
SOURCE: Replacement brake pads for 06 Lexus GS 300?
go with standard pads.they wear a little faster than ceramics.but they dont wear down brake rotors.ceramics pads are hard and they cause brakes to squeak.also your car is under warranty with lexus dealership.i would use what they said. because you have future brake problem. they will void out warranty for not using their brakes.
SOURCE: how to change rear brake pads on 06 Lexus GS 300
Rear brakes similar to fronts except that caliper piston must be screwed back instead of compressed (due to use of parking brake).
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