MajorCommonSuspension

Toyota Fortuner: Rear Leaf Spring U-Bolt Corrosion and Fatigue

Rear Leaf Spring U-Bolt Corrosion and Fatigue is a common suspension fault on the Toyota Fortuner on the 2005–2015 cars, and we rate it major. Putting it right costs $280 to $650 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 21 documented faults on the Toyota Fortuner.

Vehicle: Toyota Fortuner
Years: 2005–2015
System: Suspension

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

All Toyota Fortuner faults21 documented faults on this model

What you are looking at

No photograph available

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

What goes wrong

The AN50/AN60 Fortuner uses a rear leaf spring setup with U-bolts clamping the spring pack to the axle. In NZ and Australian coastal or high-rainfall environments these U-bolts corrode and can develop fatigue cracks, particularly at the bend radius. A failed U-bolt allows the axle to shift on the spring pack, causing sudden handling instability and potential loss of control. This is a safety-critical item that is often missed on cursory inspection as the U-bolts are partially obscured.

What you would notice

Clunking from the rear suspension under acceleration or load
Rear axle appears offset or misaligned visually
Handling instability or rear wandering under load
Visible rust or cracking on U-bolt shafts or nuts

How to check it

Where to look. Rear axle housing, leaf spring U-bolt clamps both sides

Inspect all four rear U-bolts for surface rust, pitting, and cracking at the bend radius.
Check U-bolt nuts for corrosion and confirm they can be torqued to specification — seized nuts that cannot be tightened require immediate replacement.
Look for any axle shift on the spring seat (witness marks).
Off-road-used or beach-used vehicles are highest risk.

Parts involved: Rear leaf spring, Body corrosion.

What it costs to put right

$280 to $650 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 vehicle been used near the coast or on beach driving?”
“Have the rear U-bolts been replaced or inspected recently?”
“Has any clunking from the rear been noticed under load?”

Now check the Toyota Fortuner 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.

Toyota Fortuner buyer questions

Is rear leaf spring u-bolt corrosion and fatigue serious on a Toyota Fortuner?

We rate it major and common on the Toyota Fortuner. The AN50/AN60 Fortuner uses a rear leaf spring setup with U-bolts clamping the spring pack to the axle. In NZ and Australian coastal or high-rainfall environments these U-bolts corrode and can develop fatigue cracks, particularly at the bend radius. A failed U-bolt allows the axle to shift on the spring pack, causing sudden handling instability and potential loss of control. This is a safety-critical item that is often missed on cursory inspection as the U-bolts are partially obscured.

How much does it cost to fix on a Toyota Fortuner?

$280 to $650 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 Toyota Fortuner years are affected?

Our research records this fault on the 2005–2015 Toyota Fortuner. 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.

How do I check for it before I buy?

Inspect all four rear U-bolts for surface rust, pitting, and cracking at the bend radius. Check U-bolt nuts for corrosion and confirm they can be torqued to specification — seized nuts that cannot be tightened require immediate replacement. Look for any axle shift on the spring seat (witness marks). Off-road-used or beach-used vehicles are highest risk. Look here: Rear axle housing, leaf spring U-bolt clamps both sides