I had a problem with my 2002 camaro light flickering all the time. I used a little dish detergent in the bottle and used high pressure water squirted into the bottle. It of course overflowed all foaming but you should have seen all the brown gunk it took out. I did that twice more, and that light never came on again unless it was actually low. Maybe a heavy duty flush cleaning would help? I don't know but could it hurt?