means that the "cia" aka cold air intake setups , normally dont come with a water bypass valve and since most cia s are closer to the ground
or lower than the stock level if you run into a puddle of water then water goes into the engine via the cia ,hidrolocking your engine and the
water bypass valve prevents that by sucking air trough the minifilter instead of sucking water as water is heavy .
<a href="/forum/index.php?showuser=21196"><img src='http://obd2guru.com/dio/obd2guru.gif' border='0' alt='user posted image' /></a>
If everithing fails try the hammer. obd2? <a href='http://www.obd2guru.com' target='_blank'>obd2guru.com</a>