cel 410 and 1411
 

hi, 99 boxter, 73k, new plugs, maf, air filter, 2 new o2 sensors. new codes popping up usually when car is cold or near cold, anywhere from 100 to 1000 miles. reader says problem in secondary air system. can you point me in the right direction? love the car. have had some success fixing or maintaining it myself. thanks.