MajorCommonSuspension

Mazda CX-9: Front Lower Arm Rear Bush Failure - Front-End Shimmy

Front Lower Arm Rear Bush Failure - Front-End Shimmy is a common suspension fault on the Mazda CX-9 on the 2016 onward cars, and we rate it major. Putting it right costs $420 to $1,350 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 26 documented faults on the Mazda CX-9.

Vehicle: Mazda CX-9
Years: 2016 onward
Fuel: petrol
Gearbox: auto
System: Suspension

This page covers the Mazda CX-9 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Mazda CX-9 faults26 documented faults on this model

What you are looking at

What goes wrong

The TC CX-9 front suspension uses a double-wishbone-style arrangement with a lower control arm retained by two rubber bushes. The rear bush of the front lower arm is subject to high torsional and longitudinal loads, particularly on variable-surface roads common in NZ/AU. The rubber bond degrades and separates from the outer metal sleeve, allowing the arm to shift fore-aft under braking and cornering loads. This produces a shimmy or wobble transmitted through the steering wheel, vague straight-line tracking, and a clunk over sharp bumps. The failure is common enough that aftermarket polyurethane replacement bushes are widely available from NZ/AU suppliers.

What you would notice

Steering wheel shimmy or wobble at 80-110 km/h
Vague or wandering straight-line tracking on unsealed or variable roads
Clunk or thud from front suspension over sharp bumps or speed humps
Increased tyre wear on front axle, particularly inner edge
Wander during braking from highway speed

How to check it

Where to look. Front lower control arm, rear mounting bush — both sides of front axle

Visually inspect the rear bush for cracking, separation, or rubber extruding from the sleeve. Check wheel alignment records; repeated toe or caster drift is a secondary indicator of bush wear. If a workshop inspection is possible: With the vehicle on a hoist, grasp each front lower arm and apply firm fore-aft force — any visible movement or clunk indicates bush failure.

Parts involved: Ball joint.

What it costs to put right

$420 to $1,350 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has there been any steering shimmy, wobble, or vagueness at highway speed?”
“Have the front lower arm bushes been inspected or replaced?”
“When was the last four-wheel alignment performed and what were the readings?”

Now check the Mazda CX-9 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Mazda CX-9 buyer questions

Is front lower arm rear bush failure - front-end shimmy serious on a Mazda CX-9?

We rate it major and common on the Mazda CX-9. The TC CX-9 front suspension uses a double-wishbone-style arrangement with a lower control arm retained by two rubber bushes. The rear bush of the front lower arm is subject to high torsional and longitudinal loads, particularly on variable-surface roads common in NZ/AU. The rubber bond degrades and separates from the outer metal sleeve, allowing the arm to shift fore-aft under braking and cornering loads. This produces a shimmy or wobble transmitted through the steering wheel, vague straight-line tracking, and a clunk over sharp bumps. The failure is common enough that aftermarket polyurethane replacement bushes are widely available from NZ/AU suppliers.

How much does it cost to fix on a Mazda CX-9?

$420 to $1,350 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Mazda CX-9 years are affected?

Our research records this fault on the 2016 onward Mazda CX-9. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.