MajorCommonBody & Rust

Mazda Mazda6: GG/GH Front Subframe and Lower Control Arm Mount Corrosion

GG/GH Front Subframe and Lower Control Arm Mount Corrosion is a common body & rust fault on the Mazda Mazda6 on the 2002–2012 cars, and we rate it major. Putting it right costs $1,500 to $5,000 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 48 documented faults on the Mazda Mazda6.

Vehicle: Mazda Mazda6
Years: 2002–2012
System: Body & Rust

This page covers the Mazda Mazda6 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 Mazda6 faults48 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Body corrosion yet. We would rather show none than show a picture of a different part.

What goes wrong

The GG (2002-2007) and GH (2008-2012) Atenza front subframes are fabricated from mild steel with inadequate factory anti-corrosion treatment for markets with road salt or high humidity. The subframe main rails, rear mounting points, and lower control arm pivot brackets develop heavy surface corrosion that penetrates to structural steel. In advanced cases the control arm mounting points corrode through, causing looseness in the front suspension geometry and creating a dangerous MOT/WOF failure condition. This is a documented pattern in NZ Japanese imports.

What you would notice

Orange rust scale visible on the front subframe crossmember from beneath the vehicle
Knocking or clunking from the front suspension over bumps caused by loose control arm pivots in corroded brackets
Failed NZTA WOF inspection for structural corrosion at the front subframe mounting points
Vague steering and increased understeer as geometry wanders from corroded pivot points

How to check it

Where to look. Front subframe crossmember, particularly rear subframe-to-body mounting points and lower control arm rear pivot brackets

Probe the subframe rails and mounting flanges with a screwdriver — sound steel will resist, corroded sections will flex or crumble. Pay particular attention to where the rear subframe bolts pass through the body and to the control arm brackets. Check for orange rust scale falling from the subframe, and look at the inner sills above the subframe mounts for rust transfer. If a workshop inspection is possible: Place the vehicle on a hoist and inspect the front subframe with a torch.

Parts involved: Body corrosion.

What it costs to put right

$1,500 to $5,000 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 the front subframe been inspected for corrosion by a workshop?”
“Has the car recently passed a WOF and did the inspector note any undercarriage rust?”
“Has the car spent time in regions with road salt or heavy coastal exposure?”

Now check the Mazda Mazda6 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 Mazda6 buyer questions

Is gg/gh front subframe and lower control arm mount corrosion serious on a Mazda Mazda6?

We rate it major and common on the Mazda Mazda6. The GG (2002-2007) and GH (2008-2012) Atenza front subframes are fabricated from mild steel with inadequate factory anti-corrosion treatment for markets with road salt or high humidity. The subframe main rails, rear mounting points, and lower control arm pivot brackets develop heavy surface corrosion that penetrates to structural steel. In advanced cases the control arm mounting points corrode through, causing looseness in the front suspension geometry and creating a dangerous MOT/WOF failure condition. This is a documented pattern in NZ Japanese imports.

How much does it cost to fix on a Mazda Mazda6?

$1,500 to $5,000 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 Mazda6 years are affected?

Our research records this fault on the 2002–2012 Mazda Mazda6. 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.