Misfire or rough idle on the 2002 Volkswagen Jetta
3 crashes 1 injury 4 of the 58 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 misfire or rough idle gets reported
Owners of the 2002 Volkswagen Jetta report misfire or rough idle at a median of 12,500 miles. A quarter of the reports come in before 7,500 miles and a quarter after 35,000 miles, from 41 reports that carried an odometer reading.
A part like this is normally expected to survive 92,000 miles. It is the 5th most-reported problem on this model year.
The mileage distribution
The reported range runs from 5,000 miles at the tenth percentile to 87,500 miles at the ninetieth, a spread of 82,477 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.
76% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 4,523 miles | 7,800 miles | 13,000 miles | 35,000 miles | 87,000 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, 3 a crash and 1 an injury 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 $250–$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 18 model years of this car. It shows up earliest on the 1998, at a median of 1 miles, and latest on the 2009 at 210,000 miles.
By volume the 2001 carries the most reports, with 65; the 2002 has 58. 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.
Coil packs which control spark to the engine failed on cylinders #2 and #4. Replaced by dealer under warranty. Five days later coil pack on cylinder #3 failed. Also replaced by dealer. The coil pack failures resulted in a considerable loss of power and a foul odor from the exhaust. In addition, the coil pack broke apart allowing the electrical parts to be exposed.
I've taken my 2002 jetta 1.8t in on 3 occasions to have an ignition coil replaced, and I'm still running the car with the fourth original ignition coil. The service manager even stated, "it's probably only a matter of time before the fourth goes bad, but we aren't authorized to replace it if it's not having any problems."
2002 jetta glx (v6). Car has 10,000 miles on it and the second ignition coil pack just failed. Car has been in the shop for 3 weeks waiting for parts this time around. Dealer indicated that several other jettas have been brought in with the same problem. Other vw owners (passat) indicated similar problems. Other dealers indicate similar problems and long wait times. I see from other complaints on the NHTSA website that this problem is epidemic in other parts of the country as well. The repeated and unexpected failure of the ignition coils is an incredibly serious safety issue for the drivers of these vehicles as well as anyone else on the highway. These coils fail without warning - the second one failed while I was hundreds of miles from home on a very lonely stretch of the western massachusetts turnpike (no cell phone service of course) early in the morning in a snowstorm!
Also reported on the 2002 Volkswagen Jetta
Other body or interior problem
Other electrical problem
Other powertrain problem
Other engine problem
Tail light, brake light or signal failure
Other visibility problem
How far this goes
Complaints are voluntary, so 58 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 misfire or rough idle happen on the 2002 Volkswagen Jetta?
Across 41 owner reports that included an odometer reading, half were filed by 12,500 miles. A quarter were filed before 7,500 miles and a quarter after 35,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is misfire or rough idle on the 2002 Volkswagen Jetta?
58 reports have been filed with NHTSA, about 1.2 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