Misfire or rough idle on the 2003 Volkswagen Jetta
When misfire or rough idle gets reported
Owners of the 2003 Volkswagen Jetta report misfire or rough idle at a median of 35,000 miles. A quarter of the reports come in before 10,000 miles and a quarter after 60,000 miles, from 17 reports that carried an odometer reading.
A part like this is normally expected to survive 92,000 miles. It is the 6th most-reported problem on this model year.
The mileage distribution
The reported range runs from 5,000 miles at the tenth percentile to 75,000 miles at the ninetieth, a spread of 66,821 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.
53% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 5,860 miles | 8,000 miles | 33,969 miles | 61,000 miles | 72,681 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 $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 2003 has 17. 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.
Ignition coil packs are faulty on 2002 vw jetta's with 1.8t engines. There are four of these parts on each 1.8t engine. This problem causes the engine to misfire to the point of the car will stall and can not be driven. Vw is aware of the problem and has not issued a recall and will only replace the defective coil that fails not all defective coils. Owners could be stranded on the roadside and face potential danger. One of my coils failed this january 13, 2003
My wife's 2002 volkswagen jetta has a bad ignition coil. Both volkswagen corporation and our local vw dealer, speedcraft in wakefield ri, admitted that they have a coil problem with all 2002 jettas and passats. They further noted to my wife that they do not have enough parts on hand to perform an actual recall. We are demanding that they replace all 4 coils since they know that it is likely that all 4 will eventually fail. They are refusing to do this. We feel it is unacceptable for them to refuse fixing a problem they know will likely occur. Such a failure at the wrong time while driving could possibly cause an accident. We are fearing for our safety.
Ignition coil on a brand new vw will go bad. I own a 2003 vw jetta 1.8t. Ignition coil #3 went out while I was driving on the highway. Car just lost power and started to run very rough. Brought it in to dealership to repair and was inform that they are aware of this problem and parts are back ordered. Shouldn't there be a notice sent out to owners about this problem and it's potential risk?
Also reported on the 2003 Volkswagen Jetta
Other body or interior problem
Other powertrain problem
Other electrical problem
Other engine problem
Overheating
Tail light, brake light or signal failure
How far this goes
Complaints are voluntary, so 17 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 2003 Volkswagen Jetta?
Across 17 owner reports that included an odometer reading, half were filed by 35,000 miles. A quarter were filed before 10,000 miles and a quarter after 60,000 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 2003 Volkswagen Jetta?
17 reports have been filed with NHTSA, about 1.1 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