Oknva05
New Member
Hey everybody. So my girlfriend has an 05 civic ex, the upper o2 sensor failed and caused the check engine light to come on. She drove it like that for a month or so, very minor to no performance issues. I swapped out the sensor with a denso last night, and now the car is running like crap when it warms up. Rpms drop to Around 500, sputters and acts like it's gonna cut off. The plugs are old so I swapped those out but still the same. It almost seems like there is a intake or vacuum leak, and I looked around where I was working and didn't see where I would have knocked anything loose. I disconnected the battery for a few minutes to clear the computer after I swapped out the sensor. Any advice would be awesome, thanks guys