Rattling noises from the front suspension while driving over rough roads can be caused by defective front sway bar bushings. Replacing the bushings with the updated design is a common repair.Google+
Car Problem Reports
Mazda Mazda5 Rattling From Front Suspension Due to Worn Sway Bar Bushings
Mazda Mazda5 Problem
Average Mileage: 57,901 mi (12,000 mi - 106,000 mi)
Visitor, 2007 Mazda Mazda5, 35,000 mi
Not fixed: rattle or clunking at the front with slightest road roughness, especially during first 20 minutes of driving. Goes away . Some days no problem.Has been happening for months.
Visitor, 2007 Mazda Mazda5, 50,000 mi
Just bought the Mazda 5 at 40000, a few months later at 50000, already replaced a rear shock that was making excessive noise when going over the slightest bumps. now a similar noise is coming from front. Mechanic says it was stabilizer links, and replaced them (300 dollars), and there is STILL NOISE. Mechanic now thinks it is stabilizer bushings. ahhh
Problem is ONLY on rough roads. I have a house in the NC mountains ( zip 27879) and I have to drive about 1 and 1/2 miles on a gravel but well maintained road, then up a gravel drivewy. I notice the noise mostly coming down my driveway slowly.... The clunking noises from the front end sound like the wheels are coming off. When I get to the paved road the noise stops completely.
Rattling noise. Dealer Service replaced rear sway bar/ bushings. Still no improvement. Maybe now try the front!!
Really irritating and makes me uncomfortable
Visitor, 2006 Mazda Mazda5, 101,000 mi
Our mechanic tells us that it is just a noise...the part will last for years and never fail but it will always rattle and a replacement part might rattle just as bad. We will turn up the radio.
Visitor, 2006 Mazda Mazda5, 88,752 mi
Bobbling noise felt thru floorboard of my mazda 5. Discovered it was a worn sway bar bushing, had them both replaced cost of repair $170 including parts.
Visitor, 2006 Mazda Mazda5, 101,900 mi
Rattling sound coming from front suspension. First replaced front struts, then lower suspension arm and sway bar link. Result was same clunking and rattling sound. Read some fix at a mazda forum was to replace sway bar bushings with the upgraded ones. Found a replacement from Auto Zone made by Energy Suspension. Problem solved!
Visitor, 2009 Mazda Mazda5, 95,000 mi
Lots of clunking/rattling from front. Mechanic is changing links and bushings and front shocks (noticed leaks too). Also changing rear shocks.
Visitor, 2006 Mazda Mazda5, 36,000 mi
clunking noise from the front on bumps or uneven road. Sway bar bushing was replaced by Mazda with a new redesigned ones. Problem reappeared again at around 75000 miles
Visitor, 2009 Mazda Mazda5, 42,300 mi
I took the car to the dealer and was told that I needed both front and rear links. I asked if they would be replaced with the same original equipment parts which did not last 40,000 miles. The response was 'yes'. At this point, I have not committed to dealer repair/replacement.