All,
This is more an FYI than a question. I recently had to take my car in for the bi-annual emissions test in Md. I promptly failed. The tech asked when the battery was replaced, I said in early Feb. The next question was how often do I drive it, my response was today. He informed me (and I'm sure many of you already knew this but I didn't) that the memory resets when the battery is replaced. The only way the emissions system works is by reading this memory as a history. I had only 2 start and stops in my history, so not enough data. All that is needed is to drive the car about a dozen times to rebuild the history. Distance is not important but the engine should get warm for best results. I am writing this for all of those who, like me, didn't know about the memory thing. Hope this prevents a future failure for any in the dark.