Airbag inflator rupture on the 2012 Mercedes Benz C300
When airbag inflator rupture gets reported
Owners of the 2012 Mercedes Benz C300 report airbag inflator rupture at a median of 40,000 miles. A quarter of the reports come in before 35,000 miles and a quarter after 65,000 miles, from 9 reports that carried an odometer reading.
A part like this is normally expected to survive 80,000 miles. It is the 2nd most-reported problem on this model year.
The mileage distribution
The reported range runs from 30,000 miles at the tenth percentile to 75,000 miles at the ninetieth, a spread of 45,346 miles across the middle 80% of reports.
A window that narrow is the signature of a part that fails on its own schedule rather than on how the car is driven — which is usually a design or supplier problem rather than wear and tear.
33% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 28,654 miles | 35,000 miles | 40,000 miles | 64,643 miles | 74,000 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
Putting it right typically runs $0–$0 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.
This mode is classified as critical, which means a failure can leave the car unable to stop, steer, or stay out of the way of traffic. It is weighted accordingly in the risk score.
The same failure on other years
The same failure is reported on 8 model years of this car. It shows up earliest on the 2016, at a median of 5,000 miles, and latest on the 2009 at 90,000 miles.
By volume the 2011 carries the most reports, with 187; the 2012 has 78. 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.
Takata recall we do not know if the bag will malfunction to the detriment of the passenger. For an average consumer, there is no way to test that. As a result, the car cannot be driven with a passenger seat occupied, and since this is a 4 door car, the intent is to have multiple passengers. The manufacturer just provided a recall notice (received by us mail 3/18/2017 after being notified by takata in january 2017. Mercedes should have had a solution ready (loaner vehicles of similar class) for the affected owners. It is not acceptable to be put at risk for the 3-4 years that they knew that the vehicle contained takata airbag, 3 months since formally notified by takata and then still not have a solution.
"takata recall" mercedes sent recall notice in march 2017, haven't heard anything else onrepairing my vehicle except tk holdings filed for bankruptcy. Still driving a high risk vehicle as a minimum would like my airbag disabled and propellant removed. This would be much more safe than using the vehicle as is since mercedes has claimed parts are not available. Nhtsa recall # 17v017
Tl* takata recall. The contact owns a 2012 mercedes-benz c300. The contact stated that the air bar warning indicator remained illuminated while driving. The vehicle was not taken to a dealer. The vehicle was not diagnosed or repaired. The contact received notification of NHTSA campaign number: 17v017000 (air bags); however, the part needed for the repair was not available. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The manufacturer informed the contact that the part was not available. The approximate failure mileage was 64,643. Vin tool confirms parts not available.
Also reported on the 2012 Mercedes Benz C300
Control arm, ball joint or bushing failure
Fuel tank, filler or EVAP failure
Other suspension problem
No-start or intermittent start failure
Brake line, hose or caliper failure
Rust or structural corrosion
How far this goes
Complaints are voluntary, so 78 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 inflator rupture happen on the 2012 Mercedes Benz C300?
Across 9 owner reports that included an odometer reading, half were filed by 40,000 miles. A quarter were filed before 35,000 miles and a quarter after 65,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is airbag inflator rupture on the 2012 Mercedes Benz C300?
78 reports have been filed with NHTSA, about 19 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