Rust or structural corrosion on the 2000 Toyota 4RUNNER
When rust or structural corrosion gets reported
Owners of the 2000 Toyota 4RUNNER report rust or structural corrosion at a median of 145,000 miles. A quarter of the reports come in before 127,500 miles and a quarter after 175,000 miles, from 79 reports that carried an odometer reading.
A part like this is normally expected to survive 120,000 miles. It is the 2nd most-reported problem on this model year.
The mileage distribution
The reported range runs from 110,000 miles at the tenth percentile to 222,500 miles at the ninetieth, a spread of 113,400 miles across the middle 80% of reports.
When the reports scatter this far, the mileage is telling you about how these cars were driven more than about the part itself.
1% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 108,800 miles | 128,000 miles | 146,000 miles | 175,000 miles | 222,200 miles |
Read the 10th percentile as “one report in ten arrived this early”. Exact figures are shown in this table because it is the table of record; everywhere else on the site they are rounded to the precision the sample can carry.
What a percentile can and cannot tell you here
These five numbers describe the readings owners gave, in order. The median is the middle one: half the reports arrived below it. The 10th and 90th are the edges of the bulk of the distribution, and the distance between them is the part worth reading. A tight spread — say 70,000 to 95,000 miles — points at something that wears out on a schedule, and the schedule is knowable. A wide one, 20,000 to 190,000, points at a fault that hits some cars and never troubles others, which means the mileage on the listing in front of you tells you very little about your odds.
What these figures are not is a survival curve. Every reading here comes from a car whose owner filed a complaint, so the sample contains only failures: it cannot say what share of the fleet made it past 150,000 miles untouched, because those owners had nothing to report. Nor is the mileage the moment of failure — it is the odometer reading as recalled at the time of filing, which may be weeks later and is sometimes rounded to the nearest ten thousand by the person typing it.
Percentiles are shown at all only once 8 readings exist for the vehicle and mode. Below that the middle of a handful of numbers is noise wearing a decimal point, so the figures are withheld rather than dressed up.
What happens, and what it costs
Putting it right typically runs $500–$6,000 at an independent US shop. That range is an editorial estimate held in this site's failure-mode catalogue, not a figure from NHTSA, and it is a repair cost rather than a diagnosis cost.
The same failure on other years
The same failure is reported on 13 model years of this car. It shows up earliest on the 2008, at a median of 75,000 miles, and latest on the 1996 at 250,000 miles.
By volume the 2004 carries the most reports, with 134; the 2000 has 97. A mode that appears across most years of a model is usually a design choice rather than a bad batch.
If one year stands out to the left, that is the year to avoid; if the whole line sits at a similar mileage, this is wear rather than a defect in one production run.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
Took 2000 4runner in to get muffler replaced. They discovered extensive frame rot/corrosion where the rear suspension trailing arm mount ties into the frame. The welded seam of the box tubing has rusted out. They wanted to let us know, because they feel the vehicle is unsafe to drive. And, they suggested we contact toyota to see if there was a recall or if sub-par metal was used, because the frame shouldn't be in such a terrible condition for a vehicle its age. The rest of the vehicle is in very good shape. There is no recall for the 2000 4runner, although there are recalls for similar problems on other toyota vehicles. We do not feel comfortable driving the car, knowing that the structure is compromised. And, we certainly can't sell the vehicle in this condition, knowing that it is a safety hazard. *tr
We own a 2000 toyota 4 runner whose frame has corroded to the point that a toyota dealer and an independent (second opinion) vehicle repair shop advised that it was and had been completely unsafe to drive. My son, who drove it 600 miles to college, was put in serious danger. We took a total loss on the car after having had it dealer serviced since buying it new in 2000. This is a safety issue according to the toyota dealer. It is precisely the issue toyota faced with the tacoma and tundra models, which they recalled and stood behind through repairs/replacement/dollar credits. We and the dealer contacted toyota directly several times and the company refuses to stand behind the 4runner with the same frame corrosion problem as those models. *tr
Tl*the contact owns a 2000 toyota 4runner. The contact stated that while having the vehicle inspected it failed inspection due to excessive frame rust. The contact called the manufacturer regarding the frame rust and the manufacturer stated that there was nothing they could do because there was no warranty or a recall. The contact took the vehicle to a local mechanic but they would not weld the frame due to excessive rust. The contact stated that this was a major safety issue that could cause a crash. The failure mileage was 91,000.
Also reported on the 2000 Toyota 4RUNNER
Other body or interior problem
Control arm, ball joint or bushing failure
Other suspension problem
Differential or transfer case failure
Other steering problem
Exhaust leak or fumes in the cabin
How far this goes
Complaints are voluntary, so 97 is a floor and not a count of affected cars. Mileages are typed in by owners and cluster on round numbers. And the mode itself is assigned by software reading the complaint text, which is reliable in bulk and fallible one report at a time.
Questions this page answers
At what mileage does rust or structural corrosion happen on the 2000 Toyota 4RUNNER?
Across 79 owner reports that included an odometer reading, half were filed by 145,000 miles. A quarter were filed before 127,500 miles and a quarter after 175,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is rust or structural corrosion on the 2000 Toyota 4RUNNER?
97 reports have been filed with NHTSA, about 561 per 1,000 vehicles. Complaints are voluntary, so this is a floor rather than a count of affected cars.
What this is and is not. These are the mileages at which owners chose to complain to a federal agency, which is not the same as the mileage at which the part fails on every car. It skews toward failures that happened outside warranty, cost real money, or frightened someone. It is still the only public dataset that carries failure mileage at all, and the shape of a few hundred readings is informative even when a single one is not. Methodology · JSON · this failure on other cars
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed