Misfire or rough idle on the 2018 Honda Accord
When misfire or rough idle gets reported
Owners of the 2018 Honda Accord report misfire or rough idle at a median of 75,000 miles. A quarter of the reports come in before 60,000 miles and a quarter after 105,000 miles, from 20 reports that carried an odometer reading.
A part like this is normally expected to survive 92,000 miles. It is the 10th most-reported problem on this model year.
The mileage distribution
The reported range runs from 45,000 miles at the tenth percentile to 135,000 miles at the ninetieth, a spread of 90,000 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.
5% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 47,000 miles | 57,979 miles | 75,900 miles | 105,600 miles | 137,000 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 $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 20 model years of this car. It shows up earliest on the 2016, at a median of 6 miles, and latest on the 1997 at 170,000 miles.
By volume the 2018 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.
The first night I took ownership of car, the engine light blinked and the car lost power, and became a brick. Had to turn car the off, start it, and began to function normally. Car showed 3 misfire codes on my scanner p0301, p0304, p0300. This happened several times, the dealership told me the first time nothing is wrong with the car. They checked the computer and it shows nothing happened. Reluctant to take the car I was, but lia brewster honda was very forceful and took the loaner back. Not even two nights later the car did it twice in one drive cycle. Every time this happens in the rain. Lia brewster honda has my car now for quite some time and no one can figure out what is wrong. I am upset that they told me my car was safe, I have a 9 month old daughter that is the world to me. I explained this and still was not taken into consideration. My car is still there, and no sign of being fixed. Only paid one payment on the car. They took my car due to the fact I video taped this happening. I feel the car is unsafe for my family, hope this isn't something that becomes a trend with 2018 honda 2.0t. People's safety is a number one…
Also reported on the 2018 Honda Accord
Head gasket failure
Other driver assistance problem
Cruise control failure
Other fuel system problem
Other brake problem
Other electrical problem
How far this goes
Complaints are voluntary, so 87 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 2018 Honda Accord?
Across 20 owner reports that included an odometer reading, half were filed by 75,000 miles. A quarter were filed before 60,000 miles and a quarter after 105,000 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 2018 Honda Accord?
87 reports have been filed with NHTSA, about 0.8 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