One problem related to gas recirculation valve (egr valve) has been reported for the 2010 Honda Accord. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Honda Accord based on all problems reported for the 2010 Accord.
Two weeks ago, I was driving at approximately 55 mph, the car felt as if it were switching gears sluggishly. Then I noticed the engine light had come on. I took the vehicle to o'reilly's to investigate the engine light which was caused by a p3400 code/bank 1. I researched the code and purchased 2 quarts of the 0w20 synthetic oil. The light went out after driving approximately 10 miles. I then made an appointment for an oil change, however the dealership was closed for the memorial day holiday and rescheduled for tomorrow (3 days later). The light has since come back on; I again checked the oil and had to add 2 quarts of 0w20 synthetic oil. Once again, the car is sluggish and has a new symptom of knocking when accelerating. I will have it towed in the morning for the scheduled oil change to ensure nothing is damaged. I have done additional research and found that I had received notification from Honda last year in reference to a class action settlement for service bulletin (#11-033) that addressed excessive oil consumption from a "systematic design defect that enables oil to enter into the engine's combustion chamber. This leads to premature spark plug degradation and engine malfunction. " hopefully, the dealership will repair the defect once and for all.