Airbag warning light or occupant sensor fault on the 2004 Hyundai Sonata
2 crashes 1 fire 3 of the 24 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 airbag warning light or occupant sensor fault gets reported
Owners of the 2004 Hyundai Sonata report airbag warning light or occupant sensor fault at a median of 75,000 miles. A quarter of the reports come in before 55,000 miles and a quarter after 110,000 miles, from 20 reports that carried an odometer reading.
A part like this is normally expected to survive 85,000 miles. It is the 4th most-reported problem on this model year.
The mileage distribution
The reported range runs from 40,000 miles at the tenth percentile to 120,000 miles at the ninetieth, a spread of 80,426 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.
5% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 40,000 miles | 53,700 miles | 73,000 miles | 110,000 miles | 120,426 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, 2 a crash and 1 a fire are 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 $300–$1,600 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 16 model years of this car. It shows up earliest on the 2001, at a median of 20,000 miles, and latest on the 2013 at 140,000 miles.
By volume the 2006 carries the most reports, with 321; the 2004 has 24. 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.
Tl*the contact owns a 2004 hyundai sonata. While driving at an unknown speed, the air bag light illuminated on the instrument panel. The vehicle was taken to the dealer and they stated that the air bag needed to be replaced. The vehicle has been diagnosed several different times; however, the failure is still occurring. The current mileage was 42,000 and failure mileage was 40,000.
Tl*the contact owns a 2004 hyundai sonata. The contact stated that the air bag light remains illuminated in her vehicle and does not turn off. The vehicle was taken to a mechanic and the contact was informed that the wiring located under the front passenger seat was loose or a shortage was present. Hyundai stated that the VIN was not included in a recall. The failure mileage was 53,700.
Tl*the contact owns a 2004 hyundai sonata. The contact stated that the air bag light remains illuminated in her vehicle and does not turn off. The vehicle was taken to a mechanic and the contact was informed that the wiring located under the front passenger seat was loose or a shortage was present. Hyundai stated that the VIN was not included in a recall. The failure mileage was 53,700.
Also reported on the 2004 Hyundai Sonata
Control arm, ball joint or bushing failure
Other body or interior problem
Other suspension problem
Other electrical problem
Rust or structural corrosion
Other wheel or tire problem
How far this goes
Complaints are voluntary, so 24 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 airbag warning light or occupant sensor fault happen on the 2004 Hyundai Sonata?
Across 20 owner reports that included an odometer reading, half were filed by 75,000 miles. A quarter were filed before 55,000 miles and a quarter after 110,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is airbag warning light or occupant sensor fault on the 2004 Hyundai Sonata?
24 reports have been filed with NHTSA, about 1.8 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