Quote:
Originally Posted by texvette
In 15,000 miles.
One suggested why mileage low is the vehicle is staying in Regen cycle too often. Ever since purchased hear a pump sound coming on. Some say they think its what pumping the fluid from the tank. It comes on at least once during a drive
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Not an expert but that pumping sound may be the air compressor
that keeps the rear suspension bags pumped up. I hear it every
now and again also. Not to worry. 
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