2018 Honda Fit: misfire or rough idle

Filed Jun 25, 2026 · Engine, Fuel system · OH

Purchased great condition used 2018 Fit EX on [XXX] from local non-Honda dealership. The next day, on [XXX], the following errors appeared on the dash: tire pressure monitor system, emissions, hill start assist, lane deviation warning, power steering, and vehicle stability assist errors on the screen, and the check engine, tire pressure monitoring system, vehicle stability assist system, and electric power steering lights were also on. Returned to the used dealership that same day. They replaced the spark plugs and battery, still not solved. Took it to local Honda service shop (Performance Kings Honda at 9131 Fields Ertel Rd, Cincinnati, OH 45249), diagnosed as needing fuel injectors replaced (running too rich), and got the fuel injector repair. Got the car back within a week, problem now solved. This is an issue for the federal safety agency because it is a known issue on this make and model of car by owners and Honda. See the following: Honda Service Bulletins 21-007, 22-002, 23-042. Fuel injectors are an expensive repair, and they're known to be faulty on these vehicles by the manufacturer. Without correction, other major systems in the vehicle will fail, with issues such as engine misfire, overheating, catalytic converter failure, and catastrophic damage to the engine. Honda already knows this is an issue on the 2016 and 2017 models. The warranty extension they already issued for these years must be expanded or replicated to cover this issue which has persisted in the 2018-2020 models. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jan 31, 2026 · Fuel system · MO

Before getting the recall completed on this 2018 Honda Fit I was experiencing the engine misfiring and engine stalling while driving as well as many warning light illuminating on the dashboard. When taking the vehicle to the dealership they found out that I needed a recall completed for the fuel pump so this may have been what was causing the engine misfiring, stalling, and illuminated warning lights on the dashboard. But, because I was experiencing a misfire they went ahead and charged me for a diagnosis so they can make sure there are no other issues going on. So after performing the recall on the fuel pump replacement the dealer technician says there in an active engine code and says its P0301 for engine misfire and with further checking says I need to replace a four fuel injectors with only 85,000 miles on the vehicle. Since this was the initial cause of the issue I thought this would be a recall as well but the dealer said it was not and wanted to charge me for replacement of all four fuel injectors. I believe since this is the same issue in regards to safety that they should be covering this under warranty or forced/voluntary recall. I would like there to be an investigation into this issue since this seems like a design flaw from the manufacturer which when reading the fuel pump recall says "the fuel pump failure can cause an engine stall while driving, increasing the risk of a crash" which describes the ongoing issue I have with my vehicle after the safety recall was completed.

Filed Dec 15, 2025 · Fuel system · 100,000 miles · FL

The contact owns a 2018 Honda Fit. The contact stated while driving at various speeds, the vehicle went into LIMP Mode and failed to accelerate as intended on several occasions. The contact stated that upon pulling over to the side of the road, the vehicle stalled, and the contact noticed a strong fuel odor. The vehicle failed to restart immediately on several occasions. The check engine warning light flashed upon restarting the vehicle. Additionally, the contact stated that the vehicle was experiencing rough idling. The vehicle was taken to Bird's Automotive & Customs, where the intake valves were cleaned; however, the failure recurred. The vehicle was taken back to the mechanic, where it was diagnosed and determined that the fuel was running too rich, and the contact was advised that the intake valves needed to be cleaned, but the contact declined to pay for the service because the previous service had not corrected the failure. The vehicle was not repaired. The contact stopped driving the vehicle due to the safety concerns. The contact related the failure to the federal safety agency Campaign Number: 23V858000 (Fuel System, Gasoline); however, the VIN was not included. The dealer was notified of the failure. The manufacturer was not notified of the failure. The failure mileage was approximately 100,000.

Filed Sep 25, 2025 · Engine · OR

This is after the recall on 2018-19 Fit Carbon Buildup with Misfire DTCs under codes P0300-P0304) and after fuel injectors are replaced. Current problem is with combination of carbon deposits on intake valves. Failing fuel injector/s causing an incorrect air/fuel ratio with code under P0172.

Filed Aug 20, 2024 · Fuel system · NC

Misfire codes that indicate a bad fuel injection system, including issues with previous models for the same issue. My car was running very roughly and stuttering at high speeds. An independent garage confirmed that the car had bad fuel injectors at only 80,000 miles and it cost $950 to fix. I had 6 check engine lights appear from this issue. Honda refuses to acknowledge or do anything about it.

Filed Jun 28, 2024 · Fuel system · MI

Multiple warning lights came on at the same time. OBD reader showed code 0302 (cylinder 2 misfire). Dealer performed warranty extension program to media blast the inlet valves. This was unsuccessful and the dealer now suggests that all 4 fuel injectors need replacing. The car has recorded 45k miles since new in 2018.

Filed Jun 10, 2024 · Engine, Steering · TX

VSA, power steering, engine light, and tire sensor light all came on at once. The car was not steering properly. I took the car in May 16, 2024, and they determined that a carbon buildup in the engine was the cause, and said the cylinder also had a misfire. They also said that the car needed a software update. I asked about the recall, because the recall letter I got in the mail states that if the engine light comes on, then it is eligible for repair. But they refused to repair it, claiming that the issue was only due to the carbon buildup, and said they have no parts available. However on my invoice when picking up the car, they listed the recall as if it were part of the repairs. I asked, just to verify, if they repaired it and they said no. I called the Honda number on my recall letter, and they spoke with the main manager at the dealership and told me that they determined the issue with my car wasn't due to the fuel pump recall. So do I have to drive my car until I have issues/until the engine is damaged by this safety issue? That doesn't make sense.

Filed May 10, 2024 · Fuel system · VT

Recently, our check engine light came on. We had the code tested and it came up with cylinder misfiring(P0300). Upon doing some digging I noticed that Honda has issued an extended warranty of 10 years 150,000 miles for 2018 Honda Fits experiencing the same code but for some reason mine's not included. I'm happy to bring it to a dealership to confirm the codes but if it is that same issue I would like to know that it will be treated like all these other 2018 Honda Fits. I've tried to get this resolution from Honda but have gotten no help.

Filed Oct 13, 2023 · Engine, Fuel system · TX

At 74k miles my check engine light came on randomly. Took the car to a mechanic, who turned the light off and advised me to tighten the gas cap. A few weeks later the check engine light came back on. Auto zone said a spark plug needed replacement. About a week later the check engine light, along with many other lights came on. After a lot of research I learned that there is a recurring issue with Hondas (plural) and their fueling system due to direct injection. Leading to misdiagnosis, replacing unnecessary parts, only to be left with a check engine light. Luckily, I received a letter from honda informing me of the warranty extension for certain Fits due to carbon buildup and misfires. I took my fit to the dealer and shared my concerns with the service advisor. I took it to the experts in hopes that if it was a misfire with a DTC of P0300-P0304, they would surely get it right the first time. A few hours later I was informed they found DTC P0420, meaning the catalytic converted needed to be changed. Ignition coils were also faulty, therefore affecting the catalytic converter. CC was covered under the emissions warranty but coils were not. They could not/would not replace the CC unless I agreed to replace the coils. Despite me sharing my concerns the advisor failed to mention the DTC for the coils, which turned out to be P0304. I replaced the coils and CC, paid $885. When I read the invoice and saw DTC P0304, I got upset and asked a different advisor why the carbon cleaning wasn’t performed instead of changing the coils. I was told there wasn’t enough carbon buildup to be the root of the problem and that the technician had years of experience and I could rest assured there was no other way. Fine. I take the car, less than 48 hours later, my check engine light comes on again. I take the car back. This time I am told the car is showing DTC P2198 and they recommend replacing the fuel injectors and fuel pipe! No DTC misfire, so unable to perform carbon cleanup.

Filed Apr 26, 2023 · Electrical, Engine · PA

While driving car the electrical system failed with all safety lights on dashboard turning on. When system goes off the ABS braking system, traction control, and power steering fails. Also noted engine misfiring. This happened when driving on hiway my wife drives the car to work on the hiway this has been a ongoing issue and we have had it to honda 5 times for this exact problem every time except for this last one the say they can not duplicate the problem on the 5th time they wanted to charge her 1300 to fix it but it was covered due to the same issue that has happened just a few months after getting the car something has to be done before we get hurt in the car we are in fear for our safety this happens on the interstate and i have to crawl off the road praying this has been hpping evry few months we contacted honda america and got no help

Filed Feb 22, 2023 · Fuel system · NY

Similar problem experienced as the TSB issued for 2015-2016 Honda Fits. Our 2018 exhibits the same issues as the years listed in the TSB below: Check engine lights and stumbles/misfires deeming the car unsafe to drive. the federal safety agency should encourage/mandate the entire 2015-2020 Honda Fit model run to be covered by the TSB above, since the issues/symptoms are identical in model year 2018+ cars as they are in 2015-2016. Eagerly awaiting for oyu to do something about this safety issue. Thank you!

Filed Jan 29, 2023 · Acceleration, Engine · GA

all vehicle warning lights came on specifically the check engine light for an emissions system problem. At the time the car had around 100,000 miles so it was suspected that the issue had to be with the battery, o2 sensors, or spark plug and ignition coil, so those parts were replaced. The vehicle still shows all the warning lights and reads codes for misfires in the first and second cylinder. If the issue with the fuel injectors was recalled and fixed for the 2015-2016 model Honda Fit, then it cant possibly be that the 2017-2020 honda fits also have a fuel injector problem, unless they also do and the issue has been neglected.