Rust or structural corrosion on the 2002 Hyundai Sonata
4 crashes 4 of the 39 reports for this failure mention a crash, a fire, an injury or a death. Those are the owner's words on the complaint form, not a verified finding, and one report can mention more than one.
When rust or structural corrosion gets reported
Owners of the 2002 Hyundai Sonata report rust or structural corrosion at a median of 130,000 miles. A quarter of the reports come in before 92,500 miles and a quarter after 155,000 miles, from 33 reports that carried an odometer reading.
A part like this is normally expected to survive 120,000 miles. It is the 3rd most-reported problem on this model year.
The mileage distribution
The reported range runs from 70,000 miles at the tenth percentile to 185,000 miles at the ninetieth, a spread of 114,200 miles across the middle 80% of reports.
A spread this wide points at use rather than design. Towing, climate, service history and city mileage all move a failure like this, so the median is a weak guide to any individual car.
0% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 69,800 miles | 91,590 miles | 130,000 miles | 156,000 miles | 184,000 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
Of these reports, 4 a crash is mentioned. Owners write their own complaints and the agency does not verify them, so read this as what the reports say happened rather than as a confirmed count.
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 11 model years of this car. It shows up earliest on the 2013, at a median of 70,000 miles, and latest on the 2004 at 130,000 miles.
By volume the 2002 is the worst of them, which makes this a problem of this specific year rather than of the model as a whole.
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.
I was driving on a highway with my 2002 hyundai sonata with a 2.7 ltr. 6 cyl. Engine,when I got off at my exit I took a right turn with no problem but when I went to take an immediate left turn I totally lost my power steering making it very hard to steer. When I looked under the hood I found that the metal line had rusted through and burst. This is only a 4 year old car. It was towed to garvey hyundai where they replaced the line. So I checked my wife's car which is identical except the color and found that her line is in the same rusted condition but had not yet burst so she called lia hyundai by our house ,told them what happened to mine and that hers is in the same corroded condition and they said they will not replace it under warranty until it also burst even if it is corroded. I feel this is a potentially dangerous situation as she may not be able to steer the car if it does burst and when mine burst it sprayed all over under the car, getting on the converter, muffler and tailpipe creating a potential fire hazard. I do not have the old part but the line runs along the frame and where it rotted they have a piece of rubber…
Took my car to shop today because the power steering was leaking, hard to turn on corners - this first appeared yesterday. I was hearing odd noises from under the car on the way to the shop. Mechanic put car on lift and showed me how the engine cradle/frame is rusted through. They suspect the problem started above and worked through as I have been a fanatic about regular maintenance on this car - always with the same shop so they know me and the vehicle. Now I'm waiting to see if hyundai will cover this. *tr
Engine cradle / cross member rusted through on passenger - side [right side] of undercarriage [3 inches?] . Apparent engine leak from air conditioner despite regular [hyundai] maintenance. *tr
Also reported on the 2002 Hyundai Sonata
Control arm, ball joint or bushing failure
Other body or interior problem
Fuel tank, filler or EVAP failure
Other suspension problem
Other wheel or tire problem
Airbag failed to deploy in a crash
How far this goes
Complaints are voluntary, so 39 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 2002 Hyundai Sonata?
Across 33 owner reports that included an odometer reading, half were filed by 130,000 miles. A quarter were filed before 92,500 miles and a quarter after 155,000 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 2002 Hyundai Sonata?
39 reports have been filed with NHTSA, about 0.9 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