This is my problem. My CEL turns on intermittently. When the car is cold the CEL does not come on. When I drive about 35 miles or so it comes on. I don't notice any change in performance. I checked the code once I parked and it flashed once for about 2 seconds and then a long pause then flashed for 2 seconds again. I'm sure the code is repeating. I am confused though as to what code it is throwing. I read many posts about interpreting codes. I read that long flashes are first for a 2 digit code. But in my case there is only one long flash and nothing to follow. Does this mean it is throwing a code 10? Short flashes indicate 1 digit codes but no short flashes occur. I just switched out my O2 Sensor so it couldn't be a code 1. Please help me interpret this code. I'm hoping it is something simple.