hi guys, first off, let me say that I know how to search and yes, I read threads on AA code, but I still think that my situation is somewhat different from the ones described in there. Here is what happens. During a warm-up, when my car idles when it is stationary I get no codes at all, although I let it idle anywhere from 2 to 3 minutes. There is no rough idle, no strange sounds - nothing, everything is just normal. I turn the motor off, read codes (there is nothing to read), turn the motor on and start driving. When, having driven a car for about 5 mins, I stop to check codes - I get AA code. It looks quite strange to me because, based on what I read, the secondary air pump stops working after about 2 mins after the first start and it is well within the warm-up time, where, as I have mentioned, I get no codes. I tried those measurements for 4 times (last 2 days) and the result is the same. Stationary idle for 2 - 3 mins - no codes, driving after that for 5 minutes - AA code. I would appreciate your comments and/or suggestions. One more piece of puzzle: the car was in a garage for last 2 months, but battery was tended and it shows 75 %. The car is 2000 with 67 k on it. Thank you.