for the third time in 30,000 miles the air flow meter has failed. What reasons could cause this to keep failing? The only suggestion that i have been given is an air induction kit, but i still have standard air box. The car has courtenay cs3 with 9 intercooler, dump valve pre-cat removed and cat back exhaust. The dealer replaced it under warranty first two times but are being difficult this time. Any idea what is causes the air flow meter to fail and secondly if i have to buy the part, what will it cost?