2009 Honda Accord engine problems

“Component/System: Engine – piston ring failure; oil control issue related to VCM system. Available for inspection: Yes. My 2009 Honda Accord EX-L V6 (J35Z2 engine with VCM) has developed repeated misfires due to oil entering the combustion chamber, consistent with Honda TSB 13-078. It began around 96,000 miles with cylinder #3 fouling. At 121,000 miles, cylinder #2 also misfired. A Honda dealer confirmed the issue as piston ring failure, and oil loss was measured at ~1.5 quarts per 1,000 miles. The issue causes sudden power loss, rough running, and hesitation, especially during highway driving or acceleration. This creates a serious risk of rear-end collisions or inability to safely merge. The misfire occurs without warning; no warning lamps were active beforehand. Brandfon Honda confirmed the diagnosis in May 2025. Honda acknowledges the defect in TSBs and prior class action litigation (Soto v. Honda), but refuses to assist because my car is outside the 8-year extended warranty window—even though I was never notified of that warranty. I’ve maintained the car carefully and reported the issue to Honda through multiple channels. This is a known defect affecting…”

“The engine is burning oil, about 2 quarts a month. The oil level consistently runs low when checked and I have to top it off with 1 qt every 2 weeks. There is no leaking under the car so the mechanic said the engine is burning the oil and I would need to replace the whole engine!. The cost of replacing the engine is more than the car is worth. I just bought it a year ago and thought Hondas were more reliable than this. The mechanic said Honda had some issues with the "rings" and tp check this website for a recall. I do not see a recall but if many other similar cars have the same problem there should be a recall that Honda should fix.”

“The contact owns a 2009 Honda Accord. The contact stated that the engine was previously rebuilt. The contact stated that the engine was misfiring while driving and coming into a stop. The check engine warning light and an unknown warning light were illuminated. The vehicle was taken to the dealer, where the spark plugs were replaced; however, the failure persisted. The vehicle was taken back to the dealer, where cylinder #1 spark plug was replaced. Additionally, the dealer informed the contact that the engine might need to be rebuilt to completely correct the failure. The vehicle was temporarily repaired. The contact referenced NHTSA Action Number: RQ24013 (Engine). The manufacturer was not notified of the failure. The failure mileage was approximately 173,643.”

“The contact owns a 2009 Honda Accord. The contact stated that the vehicle had been experiencing an oil leak. The dealer diagnosed that the valve cover gasket had failed and needed to be replaced. The contact stated that the valve cover gasket was replaced several times; however, the failure persisted. The vehicle was taken to the dealer, where it was diagnosed that a hairline fracture in the engine housing had caused the oil vacuum seal to fracture and the oil to leak. The dealer replaced the engine housing. The contact stated while driving at various speeds, there was an abnormal loud sound coming from underneath the hood, and the vehicle skipped gears and lunged forward. Additionally, the contact stated while driving 70-75 MPH, the contact noticed a burning chemical odor. The check engine warning light was illuminated. The contact pulled over to the side of the road and turned on the hazard lights. The contact then drove to the residence, where the contact opened the hood and noticed that the battery had melted. The dealer was not contacted. The manufacturer was notified of the failure and a case was opened. The failure mileage was approximately 84,000.”

“Burns oil due to bad piston rings. They are notorious for it and everyone that has a 8th generation Honda Accord (2008-2012) knows this is one of the biggest problems with the vehicle.”

“The bolt that secures the Serpentine Belt tensioner broke off at the engine block. This disables the power steering and the alternator. This is the third time this has happened. Fortunately for me it has happened when I could stop the car without wrecking it. Without power steering it is all most impossible to steer. I have learned that this is a problem with several Honda models. The tensioner is hydraulic and is secured with one bolt. Honda has issued service bulletins about the problem, but they still break. If mine had gone out at road speed or in traffic I may have been seriously hurt or killed. Some other Honda models come with a spring tensioner, and apparently work OK. I have found a lot of information about this problem on Honda forums. Arlington Car Care, in Upper Arlington, Ohio has been great to me in researching the problem and fixing mine 3 times at their expense. I feel Honda should recall cars with this tensioner and replace it with a spring tensioner that is safe. I wonder if the hydraulic unit is affected by cold weather, making the tension too strong and overpowering the single bolt. The shop has been able to get the broken bolt out of the…”