One or both of the rear sway bar end links may break resulting in a knocking noise from the rear of the vehicle.Google+
Car Problem Reports
Honda Accord Knocking Noise From Rear of Vehicle
Honda Accord Problem
Average Mileage: 85,777 mi (28,000 mi - 156,000 mi)
Visitor, 2000 Honda Accord, 93,000 mi
Bought vehicle used and inspected at dealer. Replaced links.
Visitor, 2001 Honda Accord, 134,000 mi
$160 to replace both sides since it comes in a kit of 2.
Visitor, 1999 Honda Accord, 95,000 mi
rear sway bar went bad, identified by knocking sound when reversing, replaced sway bar/bars
Visitor, 2003 Honda Accord, 86,000 mi
Broken left rear sway bar link. 114,000 miles and now the left front one has broken.
my sway bar had to be replaced.. my mechanic did not tell me this was common for Honda's... I'm thinking my 1988 Honda was a better car than my 2001...
Visitor, 2003 Honda Accord, 100,000 mi
Knocking noise...noticied the drivers side was broken...I bought the replacement from honda and installed myself...easy fix.
Visitor, 2005 Honda Accord, 30,000 mi
Definitely heard the 'Ka-chunk' whenever leaving my driveway. It is a known defect, the dealer fixed this issue!